Best Postman Alternatives: 13 open source API / REST Development tools

Postman is a great tool but it might not fit everyone. Since it's a tool for developers you can be sure there are many other similar tools that do stuff a little bit different. So whatever the reason is that you want to replace Postman check the list below. Thousands of other users has provided their opinion about what they like the most.

The list of alternatives was last updated: 2/5/2019 7:21:00 AM
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Alternatives to Postman for all platforms with Open Source License

  • Insomnia REST Client

    Debug APIs like a human, not a robot. Insomnia is a simple yet powerful REST API Client with cookie management, environment variables, code generation, and authentication for Mac, Window, and Linux.

    • The features are almost the same with postman. Guest • Aug 2017 • 6 agrees and 1 disagrees Disagree   Agree
    • Very Light and Fast. Really recommended sekti92 • Sep 2016 Disagree   Agree
    • Very easy to use. Clean interface. Guest • Mar 2017 • 1 agrees and 1 disagrees Disagree   Agree
    • Easy to use. better and simpler interface. Guest • 15 days ago Disagree   Agree
    • Request chaining, test scripting and setting up environment variables are still in an experimental stage. Postman offers these features out of the box in a well designed and elegant way. Guest • Oct 2017 • 1 agrees and 9 disagrees Disagree   Agree

    Freemium $ $ $ Open Source Mac Windows Linux

    Separated workspaces Cloud sync Configurable request timeout Electron based ... Import Curl commands Support for Keyboard Shortcuts Image Preview REST API SSL client certificates Support environment variables SVG Editors Add a feature

    Insomnia REST Client icon
    Reuse common variables like API keys using environments. Define them globally or switch between sub-environments for a seamless development/production workflow.
    Specify URL, payload, headers, and authorization all in one place. Then just hit send.
    Change the color scheme.
    Generate code snippets for over thirty different language libraries, like NodeJS, Go, Swift, Python, Java, C, and others.
    Easily view and manage cookies in a simple yet powerful interface. Cookies are automatically stored and sent with every request, just as you would expect.

  • soapUI

    Eviware, the maker of soapUI, Web Service Testing Leader soapUI is a tool for functional testing, mainly of web services like SOAP based web services and RESTful web services, but also HTTP based services and JMS Services as well as databases. soapUI is an open source and completely free tool with a commercial companion, soapUI Pro, with extra functionality for companies with mission critical web services.

    Free Open Source Mac Windows Linux

    No features added Add a feature

    soapUI icon

  • HTTPie

    httpie - HTTPie is a CLI, cURL-like tool for humans. HTTPie (pronounced aych-tee-tee-pie) is a command line HTTP client. Its goal is to make CLI interaction with web services as human-friendly as possible. It provides a simple http command that allows for sending arbitrary HTTP requests using a simple and natural syntax, and displays colorized responses. HTTPie can be used for testing, debugging, and generally interacting with HTTP servers.

    Free Open Source Mac Windows Linux

    Command line interface Add a feature

    HTTPie icon

  • Advanced REST Client (ARC)

    Cross platform API testing Use ARC on any major platforms including Windows, MacOS and Linux. Simplicity Easy and clean user inteface helps you make test request faster. Works with Google Drive Store your requests and projects on Google Drive and share it with your team. More data then other tools ARC implements it’s own HTTP client that works directly on a socket. As a result you receive detailed information about request timings, redirects and even sent HTTP message body.

    Free Open Source Mac Windows Linux Chrome OS Chrome ... Chromium Chrome Web Store

    REST API Add a feature

    Advanced REST Client (ARC) icon

  • HttpRequester

    HttpRequester is a tool for Firefox for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions. This tool is useful when doing web or REST development, or when you need to make HTTP requests that are not easily done via the browser (PUT/POST/DELETE).

    Free Open Source Mac Windows Linux Firefox

    Firefox Extensions REST API Add a feature

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  • RESTClient

    RESTClient can be used to test variety of HTTP communications and RESTful webservices. Friendly GUI, rich functionalities.

    Free Open Source Mac Windows Linux

    No features added Add a feature

    RESTClient icon

  • HTTP Toolkit

    HTTP Toolkit is a beautiful, cross-platform & open-source HTTP(S) debugging proxy, analyzer & client, with built-in support for modern tools from Docker to Android to GraphQL. Setup with one click to start seeing exactly what your code is sending. Diff requests or responses, and explore overall metrics, to understand in depth. Change live traffic content, and simulate errors or performance problems to test your system.

    Free Open Source Mac Windows Linux Web

    No features added Add a feature

    HTTP Toolkit icon

  • Requester

    Powerful, modern HTTP / REST client for Sublime Text. Requester has an expansive feature set, modern UX, powerful, elegant syntax and first class support for API testing and test automation. It runs on macOS, Windows and Linux.

    Free Open Source Mac Windows Linux

    REST API Add a feature

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  • FRequest

    FRequest aims to provide a similar interface to an integrated development environment program (IDE) but for HTTP(s) apis. It should be fast, cross platform, lightweight, practical with a native look. Also it is important that project files can be easily shared and work seamless with Version Control Systems (VCS) for collaborative work.

    Free Open Source Mac Windows Linux

    Configurable request timeout Portable REST API Add a feature

    FRequest icon

  • Iron Test

    Iron Test is an open source tool for integration testing APIs such as HTTP APIs (including RESTful APIs), SOAP web services, relational databases, JMS APIs (TBD), WebSphere MQ, IBM Integration Bus (IIB), etc. It is suitable for Integration, ESB, Microservices and SOA testing. The tool * has GUI, saving user programming skills. Developers also have better experience using GUIed tool, as writing, reading and maintaining code are more brain power draining.

    Free Open Source Mac Windows Linux

    Database Testing API Testing Add a feature

  • rest-client

    Wisdom rest-client is a tool supports automated testing REST API, producing exquisite report, and generating exquisite REST API documentation based on historical cases.

    Free Open Source Mac Windows Linux

    REST API Add a feature

    rest-client icon
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