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Open Source Postman Alternatives

The best open source alternative to Postman is Insomnia REST Client. If that doesn't suit you, our users have ranked more than 50 alternatives to Postman and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Postman are soapUI, Hoppscotch, HTTPie and cURL.

Postman alternatives are mainly HTTP Clients but may also be API Clients or Uptime Monitor Services. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of Postman.
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  • Freemium • Proprietary
  • Mac
  • Windows
  • Linux
  • Online
  • Chrome OS
  • Google Chrome

Postman is a tool that facilitates the development and use of APIs. Postman provides all the functionality needed to create...

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  1. A powerful REST API Client with cookie management, environment variables, code generation, and authentication for Mac, Window, and Linux.

    Specify URL, payload, headers, and authorization all in one place. Then just hit send.
    Insomnia REST Client vs Postman opinions
    Almost everyone thinks Insomnia REST Client is a great alternative to Postman.
     all • positive • negative      relevance • date
    juls07

    Compared to postman this is definitely better the UI is less cluttered there's Linux support, and it just looks nicer.

    Top positive comment   ago
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    2
    nassyma

    Full featured, open source, freemium

    Top positive comment   ago
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    3

    It's not lightweight, because still uses Electron and not native, so consuming memory alot

    Top negative comment   ago
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    4
    scottfrost

    Many of the same features as Postman, but no sync unless you pay. This is a deal breaker to developers who work on multiple computers, like home & work PCs.

    Negative comment • ago
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    -4
    davidmiller1990x

    Found it really useful and fast, thanks!

    Positive comment • ago
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    2

    Have very usefule api call history, and clean interface, and lightweight

    Positive comment • ago
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    4
    yogidevendra

    Creating new request was easy. I loved the feature to Generate client code from the request.

    Positive comment • ago
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    1
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    7 of 18 comments
  2. soapUI icon

    soapUI

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    • Free • Open Source
    • Mac
    • Windows
    • Linux

    Eviware, the maker of soapUI, Web Service Testing Leader.

    Screenshot
    Most users think soapUI is a great alternative to Postman.

  4. Hoppscotch is an open-source API development ecosystem. It helps you create your requests faster, saving you precious time on your development.

    Screenshot
    Hoppscotch vs Postman opinions
    Most users think Hoppscotch is a great alternative to Postman.

    fully web based interface

    Positive comment • ago
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    0

    Helps you create your requests faster, saving you precious time on your development

    Positive comment • ago
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    3
  5. HTTPie icon

    HTTPie

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    • Free • Open Source
    • Mac
    • Windows
    • Linux

    HTTPie—aitch-tee-tee-pie—is a user-friendly command-line HTTP client for the API era. It comes with JSON support, syntax highlighting, persistent sessions, wget-like downloads, plugins, and more.

    Screenshot
    HTTPie vs Postman opinions
    Most users think HTTPie is a great alternative to Postman.
    LeoColman

    HTTPie doesn't contain an interface. The current UI is closed behind a private beta.

    Negative comment • ago
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    0
  6. cURL icon

    cURL

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    • Free • Open Source
    • Mac
    • Windows
    • Linux
    • BSD
    • Cygwin
    • Haiku

    cURL is a computer software project providing a library and command-line tool for transferring data using various protocols with URL syntax: supporting FTP, FTPS, SCP, SFTP, HTTP, HTTPS, TFTP, TELNET, DICT, LDAP, LDAPS and FILE.

    Screenshot
  8. Advanced REST Client icon

    Advanced REST Client

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    • Free • Open Source
    • Mac
    • Windows
    • Linux
    • Chrome OS
    • Google Chrome
    • Chromium

    API testing tool. Which allows web developers to create and test custom HTTP requests.

    Screenshot
    Advanced REST Client vs Postman opinions
    Most users think Advanced REST Client is a great alternative to Postman.

    The import request are so bad

    Negative comment • ago
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    0
    patheticcockroach

    Better features than Postman for my use case: I need full control over the headers, including the ability to remove them all, something which Postman doesn't allow to do (they add tons of junk headers)

    Positive comment • ago
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    2
    blurHY

    It has all features postman has, and it's modern

    Positive comment • ago
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    3
  9. RESTer icon

    RESTer

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    • Free • Open Source
    • Mac
    • Windows
    • Linux
    • Google Chrome
    • Firefox

    A REST client for almost any web service (Firefox and Chrome extension).

    Screenshot
    RESTer vs Postman opinions
    Almost everyone thinks RESTer is a great alternative to Postman.

    Amazing interface, integrates very well in Firefox, prettyfies the code… What else?

    Positive comment • ago
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    1
  10. RESTClient icon

    RESTClient

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    • Free • Open Source
    • Mac
    • Windows
    • Linux

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

    Screenshot
    Almost everyone thinks RESTClient is a great alternative to Postman.
  11. HttpRequester icon

    HttpRequester

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    • Free • Open Source
    • Mac
    • Windows
    • Linux
    • Firefox

    HttpRequester is a tool for Firefox for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.

    Discontinued

    Doesn't support Firefox WebExtensions:https://github.com/tommut/HttpRequester/issues/43Also latest commit d62a6ea on Mar 12, 2017.

    Screenshot
    Almost everyone thinks HttpRequester is a great alternative to Postman.

  12. 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.

    Screenshot
Showing 10 of 33 alternatives