Compare the Top Free API Management Software as of June 2025 - Page 3

  • 1
    Thunder Client

    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
  • 2
    restdb.io
    restdb.io is a simple NoSQL database backend as a service (DBaaS). With very little effort and no coding, you can quickly set up an online database with a user friendly browser-based admin interface and a secure REST API. Add a few "low" code javascript hooks and background jobs and you can automate anything, making it a perfect data storage mechanism for various application workflows. restdb.io comes with a free plan for up to three users.
    Starting Price: $29.00/month
  • 3
    NGINX
    NGINX Open Source: The open source web server that powers more than 400 million websites. NGINX Plus is a software load balancer, web server, and content cache built on top of open source NGINX. Use NGINX Plus instead of your hardware load balancer and get the freedom to innovate without being constrained by infrastructure. Save more than 80% compared to hardware ADCs, without sacrificing performance or functionality. Deploy anywhere: public cloud, private cloud, bare metal, virtual machines, and containers. Save time by performing common tasks through the built‑in NGINX Plus API. From NetOps to DevOps, modern app teams need a self‑service, API‑driven platform that integrates easily into CI/CD workflows to accelerate app deployment – whether your app has a hybrid or microservices architecture – and makes app lifecycle management easier.
  • 4
    PrestoAPI

    PrestoAPI

    PrestoAPI

    Eliminate the need for back-end development. Easily connect to your database using the connection string or server address. Customize your API methods by choosing the data to create, read, update, or delete. Presto! Your API is ready for use by your front-end development team. No back-end necessary. PrestoAPI currently supports SQL Server, MySQL, PostgreSQL, MongoDB, and Oracle database systems. Assign roles to users throughout the application or to specific projects. PrestoAPI is secured through Identity Server, OAuth 2.0, and Active Directory.
    Starting Price: $49 per month
  • 5
    Apiary

    Apiary

    Oracle

    Write an API in 30 minutes. Share it with your teammates or customers. Let them use the API mock to take your API for a spin--without writing any code. Iterate, rinse & repeat. Coding can wait until you know what your developers really need. DNA for your API, powerful, open sourced and developer-friendly. The ease of Markdown combined with the power of automated mock servers, tests, validations, proxies, and code samples in your language bindings. It's often hard to see how an API will be used until you have the chance to code against it. What wireframes are for UI design, a server mock is for API design. A quick way to prototype an API - even before you start writing code. Two clicks will link Apiary to a repository of your choice. It’s up to you whether you make the API Blueprint private or public and let the community contribute. We update API docs every time you commit, and we push commits to the repo whenever you update your documentation at Apiary. It's a virtuous cycle.
  • 6
    Webiny

    Webiny

    Webiny

    Open-source framework that helps you to architect, build and deploy solutions on top of serverless infrastructure. A self-hosted serverless CMS that includes a headless GraphQL API, asset management, and a no-code builder for static pages and forms. Scaleable & cost-effective. The built-in prerendering services makes your pages crawlable by search engines. Manage digital assets, resize and deliver images on multiple resolutions. Expand and change any aspect of the system with custom plugins and business logic. Numerous built-in performance optimizations make your sites fast and scalable.
  • 7
    Oracle API Management
    Complete API Lifecycle Management solution that supports agile API development and makes it easy to keep an eye on KPIs. True hybrid API development on any cloud and on-premises that is modern and adaptable, employing the most up-to-date security protocols. Innovate quickly to increase efficiency and bump up your bottom line. Ensure the most up-to-date security policies are in place. Use the same integration tool for either cloud or on-premises deployment for full portability. Manage your cloud service using purpose-built cloud tooling for administrative operations like backup, restore, scale-out/in, or scale up/down. Full administrative access to the SOA server through a web-based administrative console, and access to virtual machines using SSH.
  • 8
    Kusk

    Kusk

    Kubeshop

    Kusk is an Open Source API Gateway that allows you to develop, monitor and deploy your APIs in a matter of minutes. Kusk powers-up your API workflows with mocked responses and validated requests out-of-the-box and automates the deployment of the API Gateway with your favorite GitOps workflows. Have a single source of truth for your API by using the OpenAPI Standard, meaning no additional configuration files are needed!
    Starting Price: Free
  • 9
    ApyHub

    ApyHub

    ApyHub

    The ApyHub Marketplace is a one-stop platform where developers can discover, integrate, and monetize APIs effortlessly. Designed to eliminate the hassle of building and managing essential services, ApyHub provides a curated catalog of high-quality APIs, covering a wide range of use cases. ApyHub offers ready-to-use APIs across multiple categories, allowing developers to streamline their workflows and focus on real innovation.
    Starting Price: $0
  • 10
    KeyRunner

    KeyRunner

    Launchiam

    The Platform to Build, Test & Secure APIs. Transform how you design, test, and manage APIs. Collaborate easily, run tests locally, and protect sensitive data every step of the way. No Signup or Login Get started instantly—no need for lengthy sign-ups or logins. VS Code Extension & Desktop Apps Work where you're comfortable! Our VS Code extension and desktop apps integrate seamlessly with your existing workflow. Local Storage & Execution Keep data secure with local storage and execution, ensuring sensitive information stays on your device. Run Unlimited Collections Test and manage unlimited API collections, enabling effortless scaling for all your projects. Mock Servers Streamline development by creating mock servers for fast testing and API response simulation. Scriptless Testing & Playground Simplify testing with our user-friendly interface—experiment with APIs without writing any code. Our enterprise features take it even further. Contact us!
    Starting Price: $39/month/user
  • 11
    Fusio

    Fusio

    Apioo

    Fusio is an open source API management platform which helps to build and manage REST APIs. Through Fusio you can quickly build a state of the art API, set up a developer portal and monetize your API. Fusio provides a simple to use and intuitive backend. Through the backend it is possible to control and manage the complete API. Fusio provides a ready to use developer portal app which you can use to set up your API program. This is the place where developers can register to consume your API. Fusio contains many actions which you can use out of the box to solve various tasks. I.e. to proxy HTTP requests to an internal API or generate an API based on a database table. This means you can build APIs in a Low-Code style without the need to write complex code. Fusio contains a Worker-System which allows you to develop actions in different programming languages, Fusio currently supports Java, Javascript, PHP and Python.
  • 12
    DragonGlass

    DragonGlass

    OpenCrowd

    DragonGlass is a highly scalable Platform as a Service infrastructure that stores and processes (unmarshalling, indexing, signature verification, etc) data collected from the Hedera Hashgraph platform at a TPS similar to the Mainnet. For end users the platform supports a Google-like search to access accounts, transaction, smart contracts files, … almost everything produced on the Mainnet. For developers, the platform supports a wide range of REST based API’s to access all data. DragonGlass also contains a dApp Marketplace where dApp developers can list their product for users to view all details related to the dApp, including transaction history, balance history, and payment receipts.
  • 13
    Nylas

    Nylas

    Nylas

    Billions of people. Trillions of connections. One API. The Nylas APIs power applications with email, calendar, and contacts sync from any inbox in the world. Only Nylas provides one API for 100% of email, calendar, and contacts integrations. Add missing information in contact records. Make warmer intros with the help of a connection graph. Compile data from each address book to create a unified data source. Straightforward, universal connectivity to lower your costs, save time, and increase developer productivity. Transform data into insights and personalize the user experience. Fuel innovation with unique customer intelligence. Automate digital processes to drive business growth. Streamline user workflows with powerful scheduling automation. Discover how organizations just like yours are driving engagement and increasing customer satisfaction with the Nylas APIs.
  • 14
    Pipedream

    Pipedream

    Pipedream

    The fastest way to integrate APIs and run code. Pipedream is a serverless integration and compute platform that makes it easy to connect apps and develop event-driven workflows. Event sources turn any API into a real-time event stream. Create event sources to listen for new Tweets, Github events, Airtable records, RSS items, webhook events and more. Inspect events in a human-friendly way, trigger Node.js workflows on every event, or consume events in your own app via API. Workflows are composed of Node.js code steps that run on every event. Write your own Node.js (and use any npm package) or reuse actions that scaffold popular APIs. Trigger via sources or a custom URL, email address, SDK code or schedule. Auth apps once, connect to those apps in any workflow. Pipedream supports OAuth and key-based auth, and handles the OAuth flow and token refresh for you. Just link accounts to steps and reference the relevant auth info in code.
    Starting Price: Free
  • 15
    Codehooks

    Codehooks

    Codehooks

    Codehooks is a new and simplified backend-as-a-service to create complete API backends with JavaScript / Node.JS. Enjoy smooth and fast backend development with ZERO config serverless JavaScript/TypeScript/Node.js with integrated NoSQL document Database, Key-Value store, CRON Jobs and Queue Workers. The document database is built with RocksDB and provides a MongoDB-ish query language.
    Starting Price: $0
  • 16
    APILayer

    APILayer

    APILayer

    APILayer is an API marketplace that lists proprietary and third party APIs and makes them available to developers and business to all sizes. With APILayer you can get secure and scalable APIs easily. At APILayer they develop and list only the most reliable APIs for a given topic. The APIs can be tested by using a live demo on the marketplace itself. The APIs come with a guaranteed uptime of 99,9% and a subscription-based support. Enhance the power of your app with APILayer!
    Starting Price: Varies