Alternatives to API Tester
Compare API Tester alternatives for your business or organization using the curated list below. SourceForge ranks the best alternatives to API Tester in 2026. Compare features, ratings, user reviews, pricing, and more from API Tester competitors and alternatives in order to make an informed decision for your business.
-
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
JIterator
Windex Inc
JIterator Traffic Testing Platform is an automated testing solution that revolutionizes the way Java backend systems are tested. With its core functionalities centered around traffic recording and replay, it offers a streamlined approach to ensure system stability and accelerate development cycles. Key Capabilities • Traffic Recording and Replay: Capture and replay user request traffic with ease, ensuring thorough testing coverage. • Data Comparison: Quickly identify discrepancies through intelligent data comparison tools. • Automated Test Case Generation: Generate test cases automatically from recorded traffic, reducing manual effort. • Environment Simulation: Simulate and isolate testing environments for reliable and secure testing. Why Choose JIterator? • Efficiency: Streamline your testing process and reduce time-to-market. • Accuracy: Trust in the precision of automated data comparison and analysis.Starting Price: $14.95/month/user -
3
WebSniffer
WebSniffer
WebSniffer is an internet intelligence platform that tracks changes on the web and provides actionable insights to its users. The platform currently offers the following features: - view HTTP response headers of any web page - perform domain name lookups - perform IP address lookups - reverse DNS lookups - reverse IP lookups - display users information such as their IP address, user agent, and more. You can also generate random and secure passwords with WebSniffer. On the WebSniffer roadmap, the following milestones are planned: - Upgrading the user interface - Upgrading to a modern web platform - Adding API support - Adding both free and paid plans - Adding multiple separate modules, such as WHOIS, RDAP, domain monitoring, etc.Starting Price: Free -
4
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. -
5
HttpMaster
Borvid
HttpMaster is a debugging and testing tool for various HTTP applications with special focus on web APIs and RESTful web services. Key features: - HttpMaster project to store complete definition of HTTP calls in one single place. - Broad set of HTTP properties (HTTP headers, URL encoding, etc.). - Dynamic parameters to simulate variations of input data or create global API values. - Response data validation with logical expressions. - Request chaining to use data from previous request with the next request. - Extensive data upload support, including 'multipart/form-data'. - Request data builder for creating request body with an optional dynamic parameters. - Request item execution with detailed progress monitoring. - Execution groups to create batches of requests. - Comprehensive execution data review and management. - Basic request tool for ad-hoc execution. - Command line interface. - PDF reports. - Support for cURL commands.Starting Price: Starting from $69 -
6
SoapUI
SmartBear
Whether open source or commercial, SoapUI testing tools make it easy to create, manage, and execute end-to-end tests on REST, SOAP, & GraphQL APIs, JMS, JDBC, and other web services so you can deliver software faster than ever. For developers and testers looking to accelerate their ability to deliver REST & SOAP APIs, SoapUI Open Source is the simplest and easiest way to begin your API testing journey. Automate and fit API testing into your team’s continuous delivery pipeline with the next generation tool built for validation of REST, SOAP, GraphQL, microservices, and other back-end services. APIs, or Application Programming Interfaces, have become the center of software development, connecting and transferring data and logic across disparate systems and applications. Luckily, testing them can greatly improve the efficiency of your testing strategy as a whole, helping you deliver software faster than everStarting Price: $599 per year -
7
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) -
8
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. -
9
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. -
10
ReadyAPI
SmartBear
The ReadyAPI platform accelerates functional, security, and load testing of RESTful, SOAP, GraphQL and other web services right inside your CI/CD pipeline. ReadyAPI allows teams to create, manage, and execute automated functional, security, and performance tests in one centralized interface - accelerating API quality for Agile and DevOps software teams. Teams can get started by importing API definitions like OAS (Swagger) or WSDLs, testing and recording live API traffic, or virtualizing web services to remove pipeline dependencies. Create comprehensive, data-driven functional API tests without the hassle of maintaining scripts. Generate load, stress, and spike tests to validate whether your API can handle real-world traffic conditions. Secure your vulnerable APIs from XSS, malformed XML, SQL injections and more with each deployment. Remove dependencies in your testing pipeline by virtualizing RESTful, SOAP, TCP, JMS, and other web services.Starting Price: $644 per year -
11
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. -
12
Paw
Paw
Paw is a full-featured HTTP client that lets you test and describe the APIs you build or consume. It has a beautiful native macOS interface to compose requests, inspect server responses, generate client code and export API definitions. Building great software is hard, and developer tools should be helping you without the headaches. Paw is exclusively built for macOS, so you should easily get the hang of it. Every feature is built intuitively with quick mouse or keyboard shortcut access. Visually build your API requests and describe each parameter through textual descriptions, typing, and constraints. Paw natively supports JSON Schema and can import and generate fully compliant Swagger, RAML, and API Blueprint description files. Keep everyone in sync with Paw for Teams. Create a team, invite your team and everyone gets seamlessly the updates.Starting Price: $10 per month -
13
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. -
14
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 -
15
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 -
16
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 -
17
Beeceptor
Beeceptor
Beeceptor is a high-performance, no-code platform that eliminates development bottlenecks through instant API mocking and real-time traffic inspection. Don't wait for backend teams to deploy; spin up a named subdomain in seconds and start integrating immediately. Key Capabilities: - Multi-Protocol Support: Simulate REST, SOAP, GraphQL, and gRPC endpoints without writing server-side code. - AI-Powered Mocking: Use AI to generate realistic, contextually relevant test data or import OpenAPI/Swagger for CRUD-ready mocks. - Chaos Engineering: Test "unhappy paths" by simulating latencies, timeouts, and rate limits. - Local Tunneling & Proxying: Expose localhost via HTTPS and inspect live webhooks or mobile traffic in real-time. Decouple your frontend and mobile teams, stabilize CI/CD by removing third-party dependencies, and go from API design to functional mock in minutes. Beeceptor scales from solo devs to enterprise-grade integration testing.Starting Price: $10 per month -
18
SpeedyNodes
SpeedyNodes
SpeedyNodes is a service that blockchains companies and privates in an easy way to access nodes by JSON-RPC, HTTPS & WebSockets APIs. SpeedyNodes is a node provider that provides the infrastructure for building on blockchain. At SpeedyNodes we do provide reliable full, dedicated and Archive blockchain nodes. With our lightning-fast API, providing instant access to Ethereum, Polygon, Bitcoin, Binance and much more. Our service is very fast and responsive. Our positive feedback is very good . We are trying to get everyone onboard with our affordable prices. Our prices start from $50 with unlimited requests.Starting Price: $50 -
19
AIOHTTP
AIOHTTP
Supports both client and server side of HTTP protocol, both client and server web-sockets out-of-the-box, and avoids callback hell and web-server with middlewares and pluggable routing. -
20
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 -
21
RapidAPI
RapidAPI
RapidAPI Testing is a functional API testing and monitoring solution that provides an intuitive UX, support for any API type, and integration with the RapidAPI Marketplace and Enterprise Hub. RapidAPI Testing enables users and enterprises to: Ensure API Functionality – Easily create intricate functional tests for deep validation of APIs. Centralize Monitoring – Monitor and manage API tests across multiple geographies. Improve Efficiency – Integrate to the CI/CD pipeline, collaborate across teams, and natively integrate with the RapidAPI Marketplace and Enterprise Hub. RapidAPI Testing enables you to create customizable functional test flows that provide deep validation of REST, SOAP, and GraphQL APIs. An easy-to-use interface offers users three options for test generation, enabling developers and non-developers to create visual, automated, or code-based test generation.Starting Price: $59 per user per month -
22
API Fortress
API Fortress
Discover a better breed of continuous API testing and monitoring that unifies functional, integration, and load testing across internal, partner, and third party APIs. Test REST, SOAP, GraphQL, Web Services, and Microservices. Automate tests as part of a CI pipeline. Monitor internal APIs continuously. Available by Hosted Cloud, Self-Hosted Cloud, or Hybrid. At many innovative organizations, continuous API quality is more than a competitive advantage - it’s the new normal. API Fortress allows any company to simplify continuous API quality, helping developers and test engineers to significantly accelerate time-to-market without increasing risk. Automatically create your first tests in seconds from a payload, spec file, or recorded API traffic. Then edit tests in your own IDE, our downloadable IDE Forge, or the simple drag-and-drop GUI. All tests are unlocked for painless editing as part of your existing workflow. -
23
Sparrow
Sparrow
Sparrow offers a complete set of tools that facilitate the entire API lifecycle, directing R&D teams toward excellence in API design-first development. Use cURL to send API requests, and support methods like GET and POST. It simplifies interacting with APIs, handling headers, data, and authentication easily. A collaborative open source solution for API development, streamlining the creation of exceptional APIs. By collaborations, developers can shift their development practices earlier in the process, leading to higher-quality APIs and faster development. Experience effortless parallel testing across diverse environments so you get the insights on the go. Sparrow offers powerful tools for securing and managing your API data along with self-hosting capabilities, providing users with complete control over their testing environment. Stay updated with Sparrow's latest developments, insights, and resources.Starting Price: Free -
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
MigratoryData
MigratoryData
Enterprises running real-time web and mobile apps struggle with latency, bandwidth, and scalability issues, which negatively impact the total cost of ownership as well as the real-time experience of their users. These issues are inherent to the traditional techniques, such as HTTP polling or long polling, employed to achieve real-time communication using web and application servers. To overcome these issues, we created MigratoryData, a real-time messaging technology leveraging the WebSockets standard, streaming data to and from users over persistent WebSocket connections in milliseconds and with minimal traffic overhead. Unlike other real-time messaging technologies, MigratoryData has been designed to scale to a large number of users. It has been benchmarked to stream real-time data to 10 million concurrent users from a single commodity server. -
26
Autostub
Torry Harris Business Solutions
AutoStub® is an essential tool to speed up API development. It can significantly reduce your build time by quickly designing, prototyping, documenting and testing APIs. AutoStub® creates a functional mock that allows developers to work with APIs before they are fully implemented. Available as a SaaS offering, for On-Premise deployments and in a hybrid model. Key Features Simulate ReST and SOAP services Input format - Swagger files for ReST, WSDL files for SOAP services Support for GET, POST, PUT, DELETE methods in ReST Create WSDL/Swagger 2.0 based mock services; generate dummy data for API testing Get an endpoint URL that can be used on a third party SOAP client tool Improves quality by facilitating functional testing Can handle multiple test scenarios together -
27
APIJockey TEST
CgSe Computergrafik und Softwareentwicklung GmbH
Create and test HTTP and REST web service calls. Run Data based test cases and review your results in any spreadsheet application Randomize with a GUI-based Randomize-editor and include attachments with or without MTOM. Run your test executions and review compiled test result add any future point in time. Import WSDL definitions and create your SOAP tests with assertions and Datat ransfer between test steps, test cases, folders and test repositories. Edit variables of different types as string, integers, current date and time information, even relative dates with formatting options.Starting Price: $0 -
28
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. -
29
APIFuzzer
PyPI
APIFuzzer reads your API description and step-by-step fuzzes the fields to validate if your application can cope with the fuzzed parameters, and it does not require coding. Parse API definition from a local file or remote URL. JSON and YAML file format support. All HTTP methods are supported. Fuzzing of the request body, query string, path parameter, and request header is supported. Relies on random mutations and supports CI integration. Generate JUnit XML test report format. Send a request to an alternative URL. Support HTTP basic auth from the configuration. Save the report of the failed test in JSON format into the pre-configured folder.Starting Price: Free -
30
ContextForge MCP Gateway is an open source Model Context Protocol (MCP) gateway, registry, and proxy platform that provides a unified endpoint for AI clients to discover and access tools, resources, prompts, and REST or MCP services in complex AI ecosystems. It sits in front of multiple MCP servers and REST APIs to federate and unify discovery, authentication, rate-limiting, observability, and traffic routing across diverse backends, with support for transports such as HTTP, JSON-RPC, WebSocket, SSE, stdio, and streamable HTTP, and can virtualize legacy APIs as MCP-compliant tools. It includes an optional Admin UI for real-time configuration, monitoring, and log visibility, and is designed to scale from standalone deployments to multi-cluster Kubernetes environments with Redis-backed federation and caching for performance and resilience.
-
31
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 -
32
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. -
33
Infura
Infura
Infura's world-class infrastructure will ensure your decentralized application scales to meet your user demand. Connect your app immediately with our instant access APIs. We support JSON-RPC over HTTPS & WebSocket interfaces, providing request and subscription-based connections. Start using Infura with a single URL. Our 24/7 team of experts is ready to handle all network changes and upgrades so you can focus on building your applications. We believe in a future powered by decentralized networks and protocols. We provide world-class infrastructure for developers so you can spend your time building and creating. You can find valuable insights, add applications, and more through our Infura dashboard. Need help or have questions? Get answers in our active community, up-to-date status page, or dig directly into our expanding library of documentation.Starting Price: $50 per month -
34
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. -
35
Evercloud
Evercloud
Evercloud platform provides developers with products, APIs, and tools, that help build, test, and run applications on TVM-compatible networks (Everscale, The Open Network (TON), Venom, Gosh, etc). Rich and high availability APIs for TVM blockchains. From small to large businesses who don't want to manage their infrastructure. Enterprises and heavy-load DApps who want to have the best API performance with the ability to extend it with custom APIs. Evercloud is for those who want to run and maintain their own node with basic API. It's also for DApp and contract developers and testers, who want to test locally before testing on real networks. Robust GraphQL API that is shared by all the products provides a smooth development flow from local testing to staging and production. Evercloud provides TVM network developers with scalable GraphQL API endpoints. Create Evercloud project and start your communication with blockchain.Starting Price: Free -
36
websockets
Python Software Foundation
An implementation of the WebSocket Protocol (RFC 6455 & 7692). websockets is a library for building WebSocket servers and clients in Python with a focus on correctness, simplicity, robustness, and performance. Built on top of asyncio, Python’s standard asynchronous I/O framework, it provides an elegant coroutine-based API. websockets is heavily tested for compliance with RFC 6455. Continuous integration fails under 100% branch coverage. websockets is built for production. For example, it was the only library to handle backpressure correctly before the issue became widely known in the Python community. Memory usage is optimized and configurable. A C extension accelerates expensive operations. It’s pre-compiled for Linux, macOS, and Windows and packaged in the wheel format for each system and Python version. websockets takes care of everything under the hood so you can focus on your application!Starting Price: Free -
37
ApiScout
ApiScout
ApiScout is your one-stop environment for building, testing, and describing Rest Apis. It is incredibly fast. No waiting or restarting. No spinners. Fast on all Mac devices. Compose requests, inspect responses ApiScout is the only HTTP Client tool you will need while building, testing, and describing your APIs. Organize requests into folders Dynamic values Use dynamically calculated values, values from previous responses, environment variables, computed hashes, etc. in every part of your requests. Environment variables Use environments to group related sets of values together. It's very handy for switching user accounts, servers, or anything else. Define variables like tokens, server base URLs, or credentials and re-use them globally for a seamless development/production workflow.Starting Price: $5 per month -
38
MaticVigil
MaticVigil
We allow you to build full-stack apps on Ethereum via Matic Network, without learning protocol specifics. Our docs cater to every developer, all the way from beginners to those already building apps via web3, and provide examples to build upon. Smart contracts are quickly deployed through our system and the resulting Open API spec along with webhook and WebSockets are instantly available to start testing. Supercharge and extend your blockchain apps with our integration services over Websockets, Webhooks, Zapier, Slack, IFTTT. The possibilities are endless. MaticVigil is an API gateway on top of the Matic-network EVM-compatible sidechain. It enables a developer to write code to interact with value transfers and transactions on Matic as if it were talking to just another web service REST API over HTTP. You can focus on coding "business logic" without worrying about the "protocol logic" behind the scenes. -
39
WireMock
WireMock
WireMock is a simulator for HTTP-based APIs. Some might consider it a service virtualization tool or a mock server. It enables you to stay productive when an API you depend on doesn't exist or isn't complete. It supports testing of edge cases and failure modes that the real API won't reliably produce. And because it's fast it can reduce your build time from hours down to minutes. MockLab is a hosted API simulator built on WireMock, with an intuitive web UI, team collaboration and nothing to install. The 100% compatible API supports drop-in replacement of the WireMock server with a single line of code. Run WireMock from within your Java application, JUnit test, Servlet container or as a standalone process. Match request URLs, methods, headers cookies and bodies using a wide variety of strategies. First class support for JSON and XML. Get up and running quickly by capturing traffic to and from an existing API. -
40
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 -
41
Gato GraphQL
Gato GraphQL
Gato GraphQL is a powerful and flexible GraphQL server for WordPress, enabling users to access and manipulate any piece of data, such as posts, users, comments, tags, and categories, via a GraphQL API. It supports building dynamic, headless sites by using WordPress as the CMS to manage data while allowing the use of any framework for rendering. It offers multiple interactive clients, including GraphiQL and Voyager, providing user-friendly interfaces for composing queries and visualizing the schema. Security features include granular access control based on user roles or IP addresses, HTTP caching for performance optimization, and the ability to create public, private, and password-protected endpoints. Gato GraphQL also supports nested mutations, custom endpoints, persisted queries, and field deprecation via the UI. Additionally, it integrates with popular WordPress plugins and external services, extending the GraphQL schema's capabilities. Starting Price: $249 one-time payment -
42
ExtendsClass
ExtendsClass
ExtendsClass provides tools directly usable in a browser. It saves you from having to install add-ons to your browser in order to add features. You have at your disposal syntax validators, code formatters, testers, HTTP clients, mock server, but also a SQLite browser. These are small and easy-to-use tools that can help when you do not want to install software on your workstation. The available tools allow you to convert data (CSV, TSV, XML and JSON), compare data (Text, XML, JSON), format data (XML, JSON) and also encode and decode base 64 data.Starting Price: Free -
43
ScrapingBypass
ScrapingBypass
ScrapingBypass Web Scraping API can bypass all anti-bot detection, Bypass Cloudflare, CAPTCHA verification, WAF, and CC protection. Provides HTTP API and Proxy with a built-in global exclusive high hidden static residential proxy IP. Includes interface address, request parameters, return processing. Also allows setting of Referrer, browser UA, headless status, and other browser fingerprint device features. Support: Python, Curl, Java, NodeJS Bypass CAPTCHA Verification Code Available to CAPTCHA, GeeTest and other verification codes Bypass Cloudflare Verification Bypass Cloudflare anti-bot scraping shield WAF, CC protection Unlimited Data Scraping Built-in one-stop global exclusive high hidden static proxy IPStarting Price: $5.9/3 days -
44
Runscope
Runscope
An API Monitoring (Runscope) API test is a group of one or more HTTP requests executed sequentially to evaluate the uptime, performance and correctness of an API. For each step in the test, you can define Assertions to validate response data and Variables to extract data to be used in subsequent requests. A test Passes if all the assertions pass. A test Fails if any assertion fails, or another error is encountered, such as a network connection problem. Your customers shouldn’t be the ones telling you about downtime and breakages. Runscope supports the notification tools you already use, like PagerDuty, Slack, HipChat, email, webhooks and more. Proactively monitor service performance to quickly catch and debug API problems fast. Stay ahead of intermittent failures before they become major issues with the API Dashboard and daily API Performance Report. Verify that the structure and content of your API calls meets your expectations. Powerful and flexible assertions give you total control. -
45
PFLB
PFLB
PFLB is an AI-powered load testing platform where you can simulate massive traffic to your websites, and applications. It’s easy to use and super helpful for teams that want to ensure their product is ready to scale. Features: Realistic testing with scenario-based traffic simulation. Importing your production load profile with Google Analytics integration. Easy scripting with an intuitive no-code editor. Executing advanced JMeter scenarios at scale. Resolving bottlenecks with AI-powered performance insights. Discovering load testing results with Grafana dashboards. Protocols: HTTP, HTTPS, gRPC, JDBC, JMS, AMQP, MQTT, Kafka.Starting Price: $50/month -
46
RestSequence
Opcito
RestSequence is a no-code platform that allows users to create end-to-end product test workflows by using underlying product-under-test APIs. It enables users to create, manage, and execute test cases and scenarios efficiently. By harnessing the power of their application's Swagger API collection, RestSequence empowers users to quickly design and test scenarios, guaranteeing superb application performance and reliability. With RestSequence, you can onboard generated test scenarios, integrate them into your CI/CD pipeline, and run them on nightly, weekly, or release builds. The best part is that the output file generated once using RestSequence can be used for future testing scenarios without making any changes. RestSequence reads and parses API details (method, URL, payload, request body, etc.) from a Swagger specification file. It tests each API endpoint for correct responses, status codes, required fields, and invalid data, tracking the created resources during test execution. -
47
Karate
Karate
Karate is the only open-source tool to combine API test automation, mocks, performance-testing and even UI automation into a single, unified framework. The BDD syntax popularized by Cucumber is language-neutral and easy for even non-programmers. Assertions and HTML reports are built-in, and you can run tests in parallel for speed. There’s also a cross-platform stand-alone executable for teams not comfortable with Java. You don’t have to compile code. Just write tests in a simple, readable syntax - carefully designed for HTTP, JSON, GraphQL and XML. And you can mix API and UI test automation within the same test script. It is worth pointing out that JSON is a ‘first-class citizen’ of the syntax such that you can express payload and expected data without having to use double-quotes and without having to enclose JSON field names in quotes. There is no need to ‘escape’ characters like you would have had to in Java or other programming languages.Starting Price: Free -
48
Finage
Finage
Financial data & solutions for everyone. Real-time Stock, Forex and Cryptocurrency market data via API, WebSocket & Widgets. Finage has more than 28.000+ symbols in real-time. We bring together everything that’s required to build financial applications that need Real-Time stock, forex and cryptocurrency data via APIs and WebSocket. You can reach more than 25.000+ U.S. stock data via Finage's Real-Time WebSocket and APIs. You can also use the 15-year Historical Data API for the U.S stocks as well. Finage offers more than 1300+ currencies in real-time & Historical Data API. Forex data all in one place, so you can access our full selection of data. We offer you more than 1500+ cryptocurrencies via API and WebSocket. Finage has the most popular cryptocurrencies as Real-time. Visuality is the best way to demonstrate complex data for easy understanding. Select custom widgets with different color schemes to best fit best on your platform. Available across most of popular platforms.Starting Price: $99 per month -
49
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. -
50
EthicalCheck
EthicalCheck
Submit API test requests via the UI form or invoke EthicalCheck API using cURL/Postman. Request input requires a public-facing OpenAPI Spec URL, an API authentication token valid for at least 10 mins, an active license key, and an email. EthicalCheck engine automatically creates and runs custom security tests for your APIs covering OWASP API Top 10 list Automatically removes false positives from the results, creates a custom developer-friendly report, and emails it to you. According to Gartner, APIs are the most-frequent attack vector. Hackers/bots have exploited API vulnerabilities resulting in major breaches across thousands of organizations. Only see real vulnerabilities; false positives are automatically separated. Generate enterprise-grade penetration test reports. Confidently share it with developers, customers, partners, and compliance teams. Using EthicalCheck is similar to running a private bug-bounty program.Starting Price: $99 one-time payment
