Alternatives to Yaak
Compare Yaak alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to Yaak in 2026. Compare features, ratings, user reviews, pricing, and more from Yaak competitors and alternatives in order to make an informed decision for your business.
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1
Postman
Postman
The collaboration platform for API development. Simplify each step of building an API and streamline collaboration so you can create better APIs—faster. Postman is a collaboration platform for API development. Postman's features simplify each step of building an API and streamline collaboration so you can create better APIs—faster. Quickly and easily send REST, SOAP, and GraphQL requests directly within Postman. Automate manual tests and integrate them into your CI/CD pipeline to ensure that any code changes won't break the API in production. Communicate the expected behavior of an API by simulating endpoints and their responses without having to set up a backend server. Generate and publish beautiful, machine-readable documentation to make your API easier to consume. Stay up-to-date on the health of your API by checking performance and response times at scheduled intervals. Provide a shared context for building and consuming APIs, and collaborate in real-time.Starting Price: $12 per user per month -
2
Bruno
Bruno Software Inc.
Bruno is an open-source, local-first API client for exploring, testing, and documenting APIs. With native Git sync, offline data storage, and no cloud dependencies, Bruno offers developers a secure, fast, and open alternative to bloated API platforms. Trusted by 150 k+ daily users and loved by 37 k+ GitHub stargazers. Pure API Client — Bruno is not a platform or cloud SaaS. It’s a lightweight desktop app focused purely on exploring, testing, and documenting APIs — no unnecessary clutter. Local-First Security — All your data and collections stay on your machine. Nothing is synced to a third-party cloud, ensuring complete control and compliance. Native Git Sync — Collaborate and version your collections using the same workflows you already use for code — pull requests, branches, and diffs — with no proprietary lock-in. Open Source & Extensible — Backed by a passionate community, Bruno evolves transparently, with frequent contributions from developers across the worldStarting Price: $6 per user per month -
3
GetAPI
GetAPI
GetAPI is a lightweight, native macOS HTTP client designed to simplify the process of making and testing REST API calls through a clean and minimal interface. Built as an alternative to tools like Postman or Insomnia, it allows developers to import existing collections, send HTTP requests, and instantly view structured responses without unnecessary complexity or setup. It is developed specifically for macOS using native technologies such as Swift and Objective-C, ensuring fast performance, smooth integration with the operating system, and a polished user experience. It supports essential API testing workflows, including request composition, navigation between requests, and quick inspection of response data, while maintaining a streamlined approach focused on speed and usability. GetAPI operates entirely locally, does not collect or sync user data to the cloud, and emphasizes privacy and control over sensitive API information.Starting Price: $39 per month -
4
Insomnia
Kong
Design, debug, and test APIs like a human, not a robot. Finally, a workflow you'll love. The Collaborative API Design Tool for designing, testing and managing OpenAPI specifications. The Desktop API client for REST and GraphQL. Make requests, inspect responses. Quickly create and group requests, specify environment variables, authentication, generate code snippets, and more. Get all the details on responses. View the whole request timeline, status codes, body, headers, cookies, and more. Create workspaces, folders, environments, drag-and-drop requests, and easily import and export your data. Create, edit, lint, debug, preview, and manage all of your OpenAPI specs in one collaborative API design editor. Generate configuration for common API gateways such as the Kong API Gateway, and Kong for Kubernetes. Sync your API designs with source control such as Github / Gitlab, and deploy directly to API Gateways such as Kong with one click.Starting Price: $5 per month -
5
Hoppscotch
Hoppscotch LTD.
Hoppscotch makes it easy to create and test your APIs, helping you to ship products faster. Create APIs faster, test them instantly, document and share them automatically. From prototyping to production - develop without switching tabs. Hoppscotch got everything you need to make API development easy. Create workspaces for your teams. Control access to your workspaces. Work together with your team in real-time. Deploy Hoppscotch on your own servers. Organize your requests in collections or folders and share them with your team. Manage your environment variables and use them everywhere. View and manage your request history. Modify headers, authenticate requests, generate random data, and much more. Test your APIs and write assertions for the response. Use Hoppscotch in your native language. We support 30+ languages. Track all the activities in your workspace. Who did what and when. Use your existing SSO provider to login to Hoppscotch. Manage your users, workspaces, and more.Starting Price: $19 per user per month -
6
Posting
Posting
Posting is an open source terminal-based API client designed to help developers build, test, and manage HTTP requests directly from the command line through a fast, keyboard-centric interface. It functions as a modern alternative to tools like Postman or Insomnia, but instead of a graphical interface, it runs as a text-based UI (TUI), allowing efficient workflows locally, over SSH, or inside remote environments and containers. It enables users to create and organize API requests into collections stored as simple, readable YAML files, making them easy to version control and share across projects. It includes features such as autocompletion, syntax highlighting, command palette access, and “jump mode” navigation to quickly move through the interface, along with support for importing and exporting cURL commands and integrating with editors like Vim for editing request bodies. -
7
Scalar
Scalar
Scalar is a modern, open source API platform designed to help developers create, document, test, and manage APIs through a unified, interactive environment built around the OpenAPI standard. It transforms OpenAPI specifications into clean, visually appealing, and interactive API documentation that allows users to explore endpoints and test requests directly within the interface, combining documentation and a full-featured API client in one place. It includes a built-in REST API client that supports sending requests, inspecting responses, handling authentication methods such as API keys and OAuth2, and working with environment variables and dynamic parameters. Scalar also offers tools for generating SDKs, managing and versioning API specifications with Git integration, and creating documentation that stays synchronized with the underlying API through Markdown or MDX workflows.Starting Price: Free -
8
Requestly
RQ Labs, Inc.
Requestly API Client offers a range of tools to help you design, manage, and test APIs effectively. With distinct combination of features Requestly acts as a companion to developers and QAs. 1. Design APIs: Requestly simplifies API Design by allowing you to create individual API requests, specify HTTP methods, headers, query parameters, and request bodies. 2. Send API Requests: Sending API Requests is at the core of API testing. Responses can be viewed in detail, including status codes, headers, and payloads. 3. API Collections: Collections allow you to group related API requests for better organization and collaboration. 4. Variables: Requestly simplify API testing and management by allowing you to replace hardcoded values with placeholders - Collection, Environment, and Global Variables. 5. Scripts (Pre & Post): Scripts allow you to add logic or modify requests before they are sent, or process responses and manipulate variables that can be used in subsequent API call.Starting Price: $0 -
9
PostPilot
PostPilot.dev
🚀 PostPilot – Your Private Workspace for APIs, Databases & Data Inspection PostPilot combines an API client, database client, and data inspector into one streamlined, local-first interface. Use Variables to link requests and organize everything in reusable Collections — fully local, fully private. ⚙️ How PostPilot Streamlines Your Development Workflow PostPilot combines three core tasks into one lightweight, local app: - API Testing: Send REST/GraphQL requests, inspect responses, and extract data. - Database Querying: Connect to your local or remote DBs and run SQL queries. - Data Inspection: Load JSON/XML, run queries, and debug data fast. All with: - Connection via Variables: Easily reuse variables across requests, queries, and scripts. - Manage requests in Collections: Save and reuse requests anytime - Private Workspace: Your data stays local. No cloud sync, no tracking.Starting Price: $40 one-time-payment -
10
Thunder Client
Thunder Client
Thunder Client is a lightweight REST API client extension for Visual Studio Code, designed to simplify API testing with an intuitive and user-friendly interface. It supports features such as collections, environment variables, and scriptless testing, allowing developers to organize requests, manage different environments, and validate API responses without the need for scripting. All data is stored locally on the user's device, ensuring privacy and security. Additionally, Thunder Client offers Git synchronization for team collaboration, enabling the saving and sharing of request data within a Git repository. Its CLI supports CI/CD integration, facilitating automated testing and report generation. Trusted by over 5 million users worldwide, Thunder Client seamlessly integrates into the VS Code environment, providing a streamlined workflow for API development and testing. Starting Price: $3 per month -
11
Hubql
Hubql
Hubql is your local-first API Client to test, share, document and ship APIs faster. Start with any OpenAPI spec either through introspection via URL or using our server libraries passing your API schema. Hubql is built as local-first library storing your data offline. Our API client runs in browser only either as a local server plugin for example as NestJS plugin or distributed directly via CDN as JS library. Organize your APIs in workspaces and Hubs. Share your API Hubs with your team members and collaborate on the same API collection. Store your environment variables in your workspace and use them in your API requests. No need to copy-paste your variables anymore. -
12
Testfully
Testfully
From powerful API client features to advanced testing and monitoring, Testfully does it all. Enjoy the flexibility of cloud and offline-only storage, seamless team collaboration, and easy migration, all in one multi-platform tool. Easily transfer your data from Postman or Insomnia directly into Testfully. Flexible and secure, set global, environment, and folder variables scoped to workspace or user. Customize auth, parameters, headers, and body to build any HTTP request easily. Work together effortlessly, add teams, assign roles, and control folder access. Supports major schemes like OAuth2 for secure and streamlined authorization. From basic to complex, Testfully enables quick, effective testing without the need for coding, making advanced API testing accessible and hassle-free. Execute all requests in a folder simultaneously, sequentially, or randomly with just one click. Validate responses and perform contract testing using a declarative format, no coding is needed.Starting Price: $49 per month -
13
Devolutions Powershell Universal
Devolutions
Devolutions PowerShell Universal turns PowerShell scripts into production-ready automation, REST and WebSocket APIs, and interactive web apps from a central admin console. Store, organize, secure, execute, and audit scripts with browser-based editing, IntelliSense, debugging, integrated Git, and a VS Code extension. Run scheduled and event-driven jobs with schedules or CRON expressions, and scale across multiple instances. Build internal tools with 70+ UI controls and expose APIs with OpenAPI docs. Includes variable and secret management, in-browser terminals, role-based access control, and authentication via local accounts, LDAP, SAML, or OpenID Connect. Supports PowerShell 7 and Windows PowerShell plus modules like Azure, Microsoft Graph, Exchange Online, and VMware. Cross-platform hosting on-premises, on AWS or Azure, in IIS, or a Raspberry Pi. Free Developer edition unlocks the full feature set for local development; a Server license is required for production. 40,000+ installs.Starting Price: Free -
14
RapidAPI
Nokia
RapidAPI for Mac is a powerful HTTP client designed specifically for macOS, enabling developers to test, build, and document APIs in one intuitive interface. It allows users to send various HTTP requests, inspect server responses, and iterate quickly during development. With its clean and native macOS design, developers can easily compose requests and manage API workflows without complexity. The tool also supports API description using JSON Schema and integrates with standards like Swagger and RAML. It simplifies API development by combining testing and documentation in a single environment. Developers can generate client code and export API definitions seamlessly. Overall, RapidAPI for Mac helps streamline API development with speed and efficiency. -
15
HTTPie
HTTPie
HTTPie is making APIs simple and intuitive for those building the tools of our time. AI assistant, HTTP methods in tabs, library context menu, cURL input mode, and more. All the user-friendliness of our terminal version is now wrapped up in a sleek graphical interface. The original. An open-source API testing client for open minds. Developers all around the world rely on HTTPie for API testing. Our users include the engineers behind some of the most important technology companies driving change today. We’re on a mission to make APIs simple and intuitive for all those building the tools, apps, and technologies of our time. We truly believe that APIs have the capacity to make our world a better place. Interact painlessly with APIs. Leverage the power of AI-assisted work. Organize your work in spaces, collections, and tabs. Parametrize requests with variables and environments. Work across devices with auto-save and realtime sync. Build and preview requests without sending them. -
16
API Tester
API Tester
API Tester is a completely free mobile app available on iOS, Android, macOS, and watchOS. It is a functional API testing tool that allows users to complete compound tasks on any device. - Test any API on the go: REST, GraphQL, WebSocket, SOAP, JSON RPC, XML, HTTP, HTTPS. - GET, POST, PUT, PATCH, DELETE, etc. HTTP request methods are supported. - Perform the API calls with any kind of request data encoding and transfer type. - Import collections from Swagger, Postman, and YAML, or import requests using cURL, as well as export created requests via link or cURL. - Use a powerful GraphQL editor with full-scale experience. - WebSocket testing tool is available: handles connection and message exchange via WS or WSS. The API Tester mobile app allows you to get the job away from your workstation. Save time, work from anywhere!Starting Price: Completely free -
17
Cowboy
99s
Cowboy is the ultimate server for the modern Web with support for Websocket, HTTP/2 and REST. Cowboy is a small, fast and modern HTTP server for Erlang/OTP. Cowboy aims to provide a complete modern Web stack. This includes HTTP/1.1, HTTP/2, WebSocket, server-sent events and Webmachine-based REST. Cowboy comes with functions for introspection and tracing, enabling developers to know precisely what is happening at any time. Its modular design also easily enables developers to add instrumentation. Cowboy is a high-quality project. It has a small code base, is very efficient (both in latency and memory use) and can easily be embedded in another application. Cowboy is clean Erlang code. It includes hundreds of tests and its code is fully compliant with the Dialyzer. It is also well documented and features a function reference, a user guide and numerous tutorials. Knowledge of the HTTP protocol is recommended but not required, as it will be detailed throughout the guide. -
18
Specmatic
Specmatic
Specmatic offers a no-code, specification-driven, visual approach to API testing by leveraging API specifications to automatically execute positive and negative tests. Specmatic Studio offers broad format and protocol support across REST, SOAP, GraphQL, gRPC, WebSockets, and asynchronous messaging systems (message queues and event-driven APIs). The platform provides a comprehensive toolkit for API development and testing, utilizing specs as the single source of truth. Key features include: • Contract testing across various protocols • Service virtualization and mocking • Workflow and resiliency testing • Backward compatibility checks to prevent breaking changes • Open-source testing tools for OpenAPI, MCP and SOAP • Postman collection import for spec creation Specmatic focuses on functional correctness, contract compliance, resiliency, and compatibility testing. Genie assists API design, enabling interactive validation of the API spec prior to generating an MCP server.Starting Price: $2500 per month (50 seats) -
19
NativeRest
NativeSoft
NativeRest is a high-performance, memory-efficient REST API client available for Windows, macOS, and Linux. Unlike Electron-based apps, it is a fully native application, which results in faster startup times and significantly lower memory and CPU usage. NativeRest supports offline work with local and cloud-based workspaces, enabling both individual and team collaboration. It includes a preconfigured proxy server to enhance privacy and security during API testing. Users benefit from an intuitive interface, powerful environment variable management, customizable HTTP methods, and code snippet generation in over 15 programming languages. A portable version is also available, requiring no installation or admin rights.Starting Price: $199 -
20
OlympAPI
OlympStack
OlympAPI is a fast, focused desktop API client built to import, export, and migrate API requests between tools without friction. One-time price instead of a subscription — a single €29 lifetime license, no recurring fees and no account lock-in. Design, send, and organize REST API requests across workspaces and collections, then keep everything version-controlled with native Git sync, tested with GitHub, GitLab, Gitea, and Forgejo. OpenAPI Auto Sync keeps your specs and requests aligned automatically. Personalize everything with custom colors for app, workspaces, and collections. Core features: - Friction-free import, export, and migration of requests and collections - Native Git sync (GitHub, GitLab, Gitea, Forgejo) - OpenAPI Auto Sync - Workspaces and collections with custom colors One-time €29 lifetime license, no subscriptionStarting Price: €29/lifetime/user -
21
RequestBin
RequestBin
RequestBin is an HTTP request inspector and webhook testing tool for capturing, inspecting, replaying, and forwarding webhooks. It gives developers temporary request bin URLs that collect incoming HTTP requests so they can analyze what clients, APIs, and third-party services are sending without writing custom debugging code. It is built for real-time HTTP request inspection, webhook debugging, and API integration testing, making it easier to view captured data such as headers, payloads, query strings, JSON, XML, and form data in a human-readable way. RequestBin supports both local and cloud storage options, allowing users to decide how they want captured requests handled during testing and development. Its documentation covers bins, request replay, forwarding rules, mock APIs, API keys, MCP server support, and developer tools for HTTP debugging and API development.Starting Price: $12 per month -
22
NOWNodes
NOWNodes
NOWNodes is a blockchain infrastructure provider that gives developers and businesses API-based access to blockchain nodes without the need to deploy, sync, or maintain them independently. The platform supports 120+ networks, including Bitcoin, Ethereum, BNB Smart Chain, Solana, and Polygon, through shared and dedicated node options. Beyond core RPC access, NOWNodes offers WebSocket connections, Blockbook indexing, archive data, Trace/Debug methods, gRPC streaming, and a Market Data API covering 9,000+ cryptocurrencies. Its infrastructure powers wallets, exchanges, dApps, and trading tools, with customers and integrations including Trust Wallet, ChangeNOW, and Exodus.Starting Price: €20 -
23
VirtuProbe Studio
VirtuProbe
VirtuProbe Studio is the request manager that chains every protocol. Chain requests across HTTP, email, LDAP, Kerberos, SMB and databases, then script the whole flow.Starting Price: $23/month -
24
Devant
WSO2
WSO2 Devant is an AI-native integration platform as a service designed to help enterprises connect, integrate, and build intelligent applications across systems, data sources, and AI services in the AI era. It enables users to connect to generative AI models, vector databases, and AI agents, and infuse applications with AI capabilities while simplifying complex integration challenges. Devant includes a no-code/low-code and pro-code development experience with AI-assisted development tools such as natural-language-based code generation, suggestions, automated data mapping, and testing to speed up integration workflows and foster business-IT collaboration. It provides an extensive library of connectors and templates to orchestrate integrations across protocols like REST, GraphQL, gRPC, WebSockets, TCP, and more, scale across hybrid/multi-cloud environments, and connect systems, databases, and AI agents.Starting Price: Free -
25
Integry
Integry
Integry helps you design, deploy, embed, and manage integrations for your SaaS, easing the load on engineering and boosting support team productivity. Build powerful integrations quickly with visual programming. Add code where you need to. Use the highest abstraction and most expressive language that makes you more productive than any programming language without sacrificing control. Integry provides connectors to 250+ apps so you can get up and running quickly without worrying about getting your own app credentials. You can customize any OAuth with your own credentials and your own branding. Run integrations on a defined interval. Run polls and process data or recurring jobs. Connect with any API on top of our integration infrastructure. Use the same powerful visual programming to add your activities. Our powerful API client helps you communicate with any API server, send any data, and process any response. -
26
Agoston.io
Agoston.io
Get instant access to a self-generated GraphQL server. The backend automatically discovers your data model. Enjoy a comfortable development experience with a hot refresh on database changes. There is no limit to your needs for simple/complex queries or function calls. GraphQL is faster than other communication APIs because it removes over-fetching and under-fetching problems. It also comes with a WebSocket under the hood: subscribe to data-specific modifications in the database and offer exceptional real-time customer experience to your user. The proven permission system from Postgres offers the flexibility to allow operations from tables to specific columns and rows. Agoston relies on this robust permission system to guarantee access to data. Users only access what they are allowed to.Starting Price: $49 per month -
27
Webhook.site
Webhook.site
Webhook.site is a tool for testing, transforming, and automating web requests, webhooks, and emails through unique URLs and email addresses that show everything sent to them instantly. With Webhook.site, users receive a unique, random URL that can be used to test and debug webhooks and HTTP requests, inspect payloads, headers, query strings, and request details in real time, and replay items later when troubleshooting or reprocessing failed flows. It helps remove the frustration of building software and automations that communicate through webhook or email by making requests visible, persistent, and easier to understand. Webhook.site also supports Custom Actions, a graphical workflow editor that runs when a URL receives a request or email, allowing users to connect incompatible APIs, convert an HTTP request to an email or vice versa, transform, validate, and process requests, and build workflows that would otherwise require development work.Starting Price: Free -
28
Yandex Lockbox
Yandex
Create secrets in the management console or using the API. Your secrets are safely stored in one place, easily integrated with your cloud services, and accessible via external systems over the gRPC or REST API. Encrypt your secrets using Yandex Key Management Service keys. Secrets are only stored in encrypted form. You can choose pre-configured service roles to ensure granular access to your secrets. Set up access permissions to read or manage your secret or its metadata. Create a secret, select a Key Management Service (KMS) key, and securely store your login-password pairs and other sensitive information. A secret may contain any of your confidential information, e.g. a login-password pair, server certificate keys, or cloud service account keys. Each secret stored by the service can have multiple versions of stored data. The service stores this data securely in encrypted form. All secrets are replicated in three availability zones.Starting Price: $0.0277 per 10000 operations -
29
Mako Server
Real Time Logic LLC
The Mako Server is a compact, event-driven web and application server designed for resource-constrained systems. Engineered for embedded environments, it combines a lightweight HTTP/HTTPS server with a Lua scripting engine, enabling high-level development with direct access to low-level C code. Its architecture delivers high performance, low memory use, and secure integration, making it ideal for systems that can’t support heavier frameworks but require dynamic web interfaces or APIs. The server supports live updates, built-in debugging, and Lua Server Pages (LSP), offering PHP-like scripting optimized for embedded use. Common use cases include device portals, diagnostic dashboards, REST APIs, and real-time WebSocket interfaces. Lua’s speed and small footprint align perfectly with the Mako Server’s goals. More than just a web server, Mako is a comprehensive framework that enables developers to integrate modern, secure, web-enabled features into compact devices.Starting Price: $498.00 -
30
Kiota
Microsoft
Kiota is a client, plugin, and manifest generator for HTTP REST APIs described by OpenAPI. Available as a command-line tool and a Visual Studio Code (VS Code) extension, Kiota enables developers to search for API descriptions, filter and select specific endpoints, and generate models and a chained method API surface in various programming languages. This approach eliminates the need to depend on different API clients for each API and allows for precise generation of the required API surface area. Additionally, Kiota facilitates participation in the Microsoft Copilot ecosystem by enabling the generation of API plugins. The VS Code extension enhances the Kiota experience with a rich user interface, supporting features such as searching for API descriptions, filtering endpoints, and generating API clients. Users can select desired endpoints and generate clients, plugins, or other outputs, with completion notifications and easy access to generated outputs within the workspace.Starting Price: Free -
31
Socket.IO
Socket.IO
In most cases, the connection will be established with WebSocket, providing a low-overhead communication channel between the server and the client. Rest assured! In case the WebSocket connection is not possible, it will fall back to HTTP long-polling. And if the connection is lost, the client will automatically try to reconnect. Scale to multiple servers and send events to all connected clients with ease. Socket.IO is a library that enables low-latency, bidirectional and event-based communication between a client and a server. It is built on top of the WebSocket protocol and provides additional guarantees like a fallback to HTTP long-polling or automatic reconnection. WebSocket is a communication protocol that provides a full-duplex and low-latency channel between the server and the browser. There are several Socket.IO server implementations available. And client implementations in most major languages. -
32
Feathers
Feathers
Feathers can interact with any backend technology, supports many databases out of the box and works with any frontend technology like React, VueJS, Angular, React Native, Android or iOS. Build prototypes in minutes and production-ready apps in days. Leveraging a unique architecture, Feathers lets you focus on building your APIs and real-time applications quickly. You automatically get scalable HTTP and real-time APIs and stay prepared for whatever else the future might bring. Feathers can be used with NodeJS, in the browser, with React Native or with any other API client. You can use any database with many supports out of the box and connect your API seamlessly to any frontend framework. Built for TypeScript, Feathers provides the structure to create complex applications but is flexible enough to not be in the way. With a large ecosystem of plugins you can include exactly what you need. -
33
WunderGraph Cosmo
WunderGraph
WunderGraph is an open source, next-generation API platform designed to unify, manage, and accelerate how developers compose, integrate, and serve APIs from diverse backends (such as REST, gRPC, Kafka, and GraphQL) into a single, type-safe, high-performance API surface that modern applications can consume. It includes Cosmo, a full lifecycle API management solution for federated GraphQL that provides schema registry, composition checks, routing, analytics, metrics, tracing, and observability, all manageable via code in your existing development workflows rather than separate dashboards. WunderGraph lets teams define how multiple services should be composed into one API, automatically generate type-safe client libraries, and handle authentication, authorization, and API calls with built-in tooling that fits into CI/CD and Git-centric processes.Starting Price: $499 per month -
34
Kestrel
Microsoft
Kestrel is a cross-platform web server for ASP.NET Core. Kestrel is the web server that's included and enabled by default in ASP.NET Core project templates. Kestrel supports HTTPS, HTTP/2 (except on macOS), Opaque upgrade used to enable WebSockets, Unix sockets for high performance behind Nginx. Kestrel is supported on all platforms and versions that .NET Core supports. Some browsers require granting explicit permission to trust the local development certificate. Project templates configure apps to run on HTTPS by default and include HTTPS redirection and HSTS support. The Kestrel web server has constraint configuration options that are especially useful in Internet-facing deployments. There's a separate limit for connections that have been upgraded from HTTP or HTTPS to another protocol (for example, on a WebSockets request). The default maximum request body size is 30,000,000 bytes, which is approximately 28.6 MB. -
35
Fiddler
Progress Software
Capture all HTTP(S) traffic between your computer and the Internet with Telerik Fiddler HTTP(S) proxy. Inspect traffic, set breakpoints, and fiddle with requests & responses. Fiddler Everywhere is a web debugging proxy for macOS, Windows, and Linux. Capture, inspect, monitor all HTTP(S) traffic between your computer and the Internet, mock requests, and diagnose network issues. Fiddler Everywhere can be used for any browser, application, process. Debug traffic from macOS, Windows, or Linux systems and iOS or Android mobile devices. Ensure the proper cookies, headers, and cache directives are transferred between the client and server. Supports any framework, including .NET, Java, Ruby, etc. Mock or modify requests and responses on any website. It’s a quick and easy way to change the request and responses to test websites without changing code. Use Fiddler Everywhere to log all HTTP/S traffic between your computer and the Internet.Starting Price: $12 per user per month -
36
Codex.io
Codex.io
Codex is an API for enriched blockchain and prediction market data. For tokens, it covers real-time pricing, charts, holders, balances, and aggregated analytics for 80M+ tokens and 700M+ wallets across 80+ networks (EVM chains and Solana), with sub-second freshness, historical USD pricing, and WebSocket and webhook subscriptions. Codex also provides prediction market data across Polymarket and Kalshi through a single schema. This includes events, markets, traders, holdings, live order books, and trade feeds, along with time-windowed stats and ranking signals (volume, liquidity, open interest, trade count, and unique traders) at 5m through 1w windows that the venue APIs do not expose natively. Codex is a GraphQL API that most teams query directly, with an optional TypeScript SDK. There is also an MCP server for reading the documentation. Codex offers a free tier (10,000 requests/month), usage-based Growth pricing, and Enterprise plans. Developers use it to build trading platforms.Starting Price: $350/month -
37
Telematics Guru Tracking Platform
Digital Matter
Our device management platform makes provisioning and monitoring Digital Matter devices simple and secure. Turn on advanced device debug logs to quickly and effectively resolve issues. Manage device settings over-the-air effortlessly. Create and manage templates to easily set configurations on multiple devices in bulk when provisioning. Forward device data to your server via HTTPS or TCP. Convenient debugging features to assist with integration. Data is sent over an AES-256 encrypted connection. This ensures the integrity and authenticity of all data. Data can then be sent via HTTPS to the end platform for complete end-to-end encryption. Many functions can be performed via API calls, such as setting parameters and connectors, enabling device control and provisioning to be handled by a 3rd party server. -
38
GraphQL
The GraphQL Foundation
GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools. Send a GraphQL query to your API and get exactly what you need, nothing more and nothing less. GraphQL queries always return predictable results. Apps using GraphQL are fast and stable because they control the data they get, not the server. GraphQL queries access not just the properties of one resource but also smoothly follow references between them. While typical REST APIs require loading from multiple URLs, GraphQL APIs get all the data your app needs in a single request. Apps using GraphQL can be quick even on slow mobile network connections. -
39
Activiti
Activiti
Helping businesses solve automation challenges in distributed, highly-scalable and cost effective infrastructures. Activiti is the leading lightweight, java-centric open-source BPMN engine supporting real-world process automation needs. Activiti Cloud is now the new generation of business automation platform offering a set of cloud native building blocks designed to run on distributed infrastructures. Inmutable, scalable & pain free Process & Decision Runtimes designed to integrate with your cloud native infrastructure. Scalable, storage independent and extensible audit service. Scalable, storage independent and extensible query service. Simplified system to system interactions that can scale in distributed environments. Distributed & Scalable application aggregation layer. Cloud ready secure WebSocket and subscription handling as part of GraphQL integration. -
40
Artillery
Artillery
Artillery is a full-stack performance and reliability testing platform that helps teams keep apps fast and reliable with load testing, scalable Playwright E2E testing, and production monitoring in one toolkit. It is modern, powerful, easy to use, incrementally adoptable, and built to work with coding agents. Engineering teams use Artillery to test and optimize applications so they stay performant and resilient under high load, testing everything from APIs to full browser experiences with the same TypeScript and JavaScript skills they already have. Artillery supports HTTP APIs, WebSocket and Socket.io services, SOAP, GraphQL, and complex web apps with real browsers. It includes built-in distributed load testing, allowing teams to run cloud-scale, multi-region tests on AWS Lambda, AWS Fargate, or Azure Container Instances without setting up or managing infrastructure.Starting Price: $199 per month -
41
Lucid KV
Lucid KV
Lucid is currently in a development stage but we want to achieve a fast, secure and distributed key-value store accessible through an HTTP API, we also want to propose persistence, encryption, WebSocket streaming, replication and a lot of features. Private Keys Storing, IoT (to collect and save statistics data), Distributed cache, service discovery, distributed configuration, blob storage etc. -
42
LogDog
LogDog
Built from the ground up for mobile developers. Monitor network requests, logs, and events in real-time. Debug faster, ship with confidence. FEATURES: - RealTime Logs: Capture every log from your application and see them appear in instantly in the dashboard - Network Monitoring: See how LogDog captures and analyses HTTP requests and responses - Event Tracking: Watch real-time event logging and analytics collection - Performance Metrics: Monitor app performance in real-time - Request Mocking: One Click to enable request mocking - throw in your own body, headers or statusCode - Any build type: Check logs from your Store builds, TestFlight and of course Xcode builds - Seamless experience: Test events across different session without annoying reattachment - Shake to Debug: Shake your device to toggle various debug features from LogDogStarting Price: $19/month -
43
Go REST
Go REST
Go REST is a GraphQL and RESTful API platform for testing and prototyping that delivers fake data with real responses, available 24/7 via public endpoints for users, posts, comments, and todos. It supports multiple API versions with full search on all fields, pagination (page and per_page), rate-limiting headers, and response format negotiation. Standard HTTP verbs are supported, and mutating requests require an access token via HTTP Bearer or query parameter. Nested resources let you retrieve related data, user posts, post comments, and user todos, while request and response logging, customizable rate limit,s and daily data resets ensure a clean testing environment. A GraphQL endpoint at /public/v2/graphql offers schema-driven queries and mutations. -
44
HELO
Beyond Code
HELO is a desktop application designed to simplify email testing and debugging for web developers by capturing and analyzing outgoing emails generated by applications during development. Instead of sending emails to real recipients, HELO exposes a local SMTP server that intercepts outgoing messages and displays them inside the application, allowing developers to inspect and verify them before deployment. This approach helps prevent common problems such as broken links, missing images, formatting errors, and other issues that often appear in production emails. It provides detailed debug views that show the email in multiple formats, including HTML rendering, plain text, raw source code, and full message headers, giving developers a complete understanding of how the message is structured. Automated validation tools check links within the email to confirm they return valid HTTP responses, reducing the risk of sending emails with invalid or broken URLs.Starting Price: $49 per month -
45
Swoole
Swoole
Powering the next-generation microservices and applications. Build high-performance, scalable, concurrent TCP, UDP, Unix Socket, HTTP, GRPC services with PHP and easy-to-use coroutine, fibers API. Write your next scalable async application with PHP coroutines and fibers. Compared with other async programming frameworks or software such as Nginx, Tornado, and Node.js, Swoole is a complete async solution that has built-in support for async programming via fibers/coroutines, a range of multi-threaded I/O modules (HTTP server, GRPC, process pools) and support for popular PHP clients like PDO for MySQL, Redis, and CURL. You can use sync or async, coroutine, or fiber API to write the applications or create thousands of lightweight fibers within one Linux process. Swoole enhances the efficiency of your PHP applications and brings you out of the traditional stateless model, enabling you to focus on the development of innovative products at a high scale.Starting Price: Free -
46
Ruby on Rails
Ruby on Rails
Over the past two decades, Rails has taken countless companies to millions of users and billions in market valuations. Over six thousand people have contributed code to Rails, and many more have served the community through evangelism, documentation, and bug reports. Rendering HTML templates, updating databases, sending and receiving emails, maintaining live pages via WebSockets, enqueuing jobs for asynchronous work, storing uploads in the cloud, providing solid security protections for common attacks. Databases come to life with business logic encapsulated in rich objects. Modeling associations between tables, providing callbacks when saved, encrypting sensitive data seamlessly, and expressing SQL queries beautifully. Controllers expose the domain model to the web, process incoming parameters, set caching headers, and render templates, responding with either HTML or JSON.Starting Price: Free -
47
AWS AppSync
Amazon
Accelerate app development with scalable GraphQL APIs. Organizations choose to build APIs with GraphQL because it helps them develop applications faster, by giving front-end developers the ability to query multiple databases, microservices, and APIs with a single GraphQL endpoint. AWS AppSync is a fully managed service that makes it easy to develop GraphQL APIs by handling the heavy lifting of securely connecting to data sources like AWS DynamoDB, Lambda, and more. Adding caches to improve performance, subscriptions to support real-time updates, and client-side data stores that keep off-line clients in sync are just as easy. Once deployed, AWS AppSync automatically scales your GraphQL API execution engine up and down to meet API request volumes. AWS AppSync offers fully managed GraphQL API and Pub/Sub API setup, administration, auto-scaling, and high availability. Easily secure, monitor, log, and trace your API via built-in support for AWS WAF, CloudWatch and X-Ray. -
48
Small Hours
Small Hours
Small Hours is an AI-powered observability platform that helps root cause server exceptions, analyze the impact, and triage to the right person or team. Use Markdown or your existing runbook to guide our assistant in debugging issues. We support OpenTelemetry for seamless integration with any stack. Hook into existing alarms and identify critical issues. Connect your codebases and runbooks as context and instructions. Your code and data are secure and never stored. Intelligently triage issues and generate pull requests. Optimized for enterprise velocity and scale. 24/7 automated root cause analysis, minimize downtime, and maximize efficiency. -
49
Bottle
Bottle
Bottle is a fast, simple and lightweight WSGI micro web-framework for Python. It is distributed as a single file module and has no dependencies other than the Python Standard Library. Requests to function-call mapping with support for clean and dynamic URLs. Fast and pythonic built-in template engine and support for mako, jinja2 and cheetah templates. Convenient access to form data, file uploads, cookies, headers and other HTTP-related metadata. Built-in HTTP development server and support for paste, bjoern, gae, cherrypy or any other WSGI capable HTTP server. -
50
OpenAgents
OpenAgents
OpenAgents is an open source framework and platform for building, connecting, and deploying networks of AI agents that can discover, communicate, collaborate, and solve problems together rather than operating in isolation, enabling developers to launch and join agent communities that work at scale and share resources seamlessly. It provides infrastructure for AI agent networks where each network acts as a self-contained community with peer discovery, message passing, and coordinated collaboration over flexible protocols such as HTTP, WebSocket, and gRPC, and is designed to be protocol-agnostic and compatible with popular large language model providers and agent frameworks to support diverse deployment scenarios. Users can build their own agents with simple configurations or integrate custom logic and tools, connect them to one or more networks, and manage interactions using OpenAgents’ standard interfaces.Starting Price: Free
