Postman AlternativesOnly Open Source apps categorised as API & HTTP Clients

If that doesn't work for you, our users have ranked more than 50 alternatives to Postman, but unfortunately only zero of them are open source API Clients. If you can't find an alternative you can try to remove all filters.

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Postman alternatives are mainly API Clients but may also be HTTP Clients or HTTP(S) Debuggers.  Filter by these or use the filter bar below if you want a narrower list of alternatives or looking for a specific functionality of Postman.
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Postman is a tool that facilitates the development and use of APIs. Postman provides all the functionality needed to create or simulate API specifications and use the Postman Collection Runner to create tests.

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Postman alternatives page was last updated Oct 22, 2024
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  1. Insomnia REST Client icon
    Insomnia REST Client icon

    Insomnia REST Client

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

    74 Insomnia REST Client alternatives
    Specify URL, payload, headers, and authorization all in one place. Then just hit send.

    License model

    • Freemium • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    • Flatpak
    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.
    +2
    Reuse common variables like API keys using environments. Define them globally or switch between sub-environments for a seamless development/production workflow.

    Properties

    1.  Lightweight

    Features

    1.  Request Chaining
    2.  Import Curl commands
    3.  REST API
    4.  REST Client
    5.  GraphQL
    6.  Cloud Sync
    7.  Support environment variables
    8.  API Management
    9.  Separated workspaces
    Insomnia REST Client iconPostman Icon

    Insomnia REST Client VS Postman

    Is Insomnia REST Client a good alternative to Postman?
     
    Comments about Insomnia REST Client as an Alternative to Postman
     
       
    Comment summary: Insomnia REST Client is favored for its lightweight, intuitive design, and lack of login requirement for basic features compared to Postman. Users value its cleaner interface, Linux support, and full features even in the freemium model. However, it lacks team collaboration features and multi-device sync without payment. While praised for better UI and storage efficiency, some users note that request chaining and environment setup are still experimental, unlike Postman's polished offerings.
    Julian Garner

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

    Top positive comment •May 23, 2021
    4
    Guest

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

    Top negative comment •Aug 28, 2021
    6
    dax0

    Very similar to Postman, but doesn't require logging in for basic features. So useful for some quick testing.

    Positive comment •Aug 26, 2023
    0
    Show more comments
    3 of 19 comments
    Postman Icon
    Insomnia REST Client icon

    • Almost everyone thinks Insomnia REST Client is a great Postman alternative.

    • Insomnia REST Client is the most popular Windows, Mac & Linux alternative to Postman.

    • Insomnia REST Client is the most popular Open Source & free alternative to Postman.

    • Insomnia REST Client is Freemium and Open SourcePostman is Freemium and Proprietary
    • Insomnia REST Client is LightweightPostman is not according to our users
  2. HTTPie for Terminal icon
    HTTPie for Terminal icon

    HTTPie for Terminal

     55 likes
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    HTTPie (pronounced aitch-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...

    33 HTTPie for Terminal alternatives
    HTTPie for Terminal screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Python
    • FreeBSD
    HTTPie for Terminal screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  Command line interface
    2.  REST API
    3.  Web Testing
    4.  API Management
    HTTPie for Terminal iconPostman Icon

    HTTPie for Terminal VS Postman

    Is HTTPie for Terminal a good alternative to Postman?
     
    Comments about HTTPie for Terminal as an Alternative to Postman
     
    scottfrost

    Update to the (only) negative comment. The UI is now free (price) but closed source.

    Positive comment •Jun 5, 2023
    1
    Blue Paint

    Can be launched without internet connection (useful in cases of restrictive VPN policy)

    Positive comment •Feb 6, 2024
    0
    Leonardo Colman

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

    Negative comment •Jun 22, 2022
    -2
    Postman Icon
    HTTPie for Terminal icon

    • Most users think HTTPie for Terminal is a great Postman alternative.

    • HTTPie for Terminal is Free and Open SourcePostman is Freemium and Proprietary
    • HTTPie for Terminal is LightweightPostman is not according to our users
  4. Hoppscotch icon
    Hoppscotch icon

    Hoppscotch

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

    63 Hoppscotch alternatives
    Hoppscotch screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Online
    • Self-Hosted
    Hoppscotch screenshot 1
    Hoppscotch screenshot 2

    Properties

    1.  Ad-free
    2.  Lightweight

    Features

    1.  REST API
    2.  GraphQL API
    3.  Websocket streams
    4.  Command line interface
    5.  Portable
    6.  Cross browser testing
    Hoppscotch iconPostman Icon

    Hoppscotch VS Postman

    Is Hoppscotch a good alternative to Postman?
     
    Comments about Hoppscotch as an Alternative to Postman
     
    Max Fisher

    AFAIK, doesn't have a feature to import cURL from clipboard.

    Negative comment •Sep 12, 2024
    0
    Guest

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

    Positive comment •Oct 29, 2019
    3
    Postman Icon
    Hoppscotch icon

    • Most users think Hoppscotch is a great Postman alternative.

    • Hoppscotch is the most popular Web-based & Self-Hosted alternative to Postman.

    • Hoppscotch is Free and Open SourcePostman is Freemium and Proprietary
    • Hoppscotch is LightweightPostman is not according to our users
  5. soapUI icon
    soapUI icon

    soapUI

     56 likes
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    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 compl.

    75 soapUI alternatives
    soapUI screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    soapUI screenshot 1
    soapUI screenshot 2
    +1
    soapUI screenshot 3

    Properties

    1.  Ad-free
    2.  Lightweight

    Features

    1.  Portable
    2.  Command line interface
    3.  Intuitive Nodes
    soapUI iconPostman Icon

    soapUI VS Postman

    Is soapUI a good alternative to Postman?
     
    Comments about soapUI as an Alternative to Postman
     
    DiskCrasher

    Can create a mock server for free.

    Positive comment •Sep 29, 2023
    0
    Postman Icon
    soapUI icon

    • Most users think soapUI is a great Postman alternative.

    • soapUI is Free and Open SourcePostman is Freemium and Proprietary
    • soapUI is LightweightPostman is not according to our users
  6. Bruno icon
    Bruno icon

    Bruno

     26 likes
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    Bruno is a new and innovative open source API client, aimed at revolutionizing the status quo represented by Postman, Insomnia and similar tools out there.

    24 Bruno alternatives
    Bruno screenshot 1

    License model

    • Freemium • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Flathub
    Bruno screenshot 1
    Bruno screenshot 2

    Properties

    1.  Lightweight
    2.  Works Offline
    3.  Ad-free

    Features

    1.  Portable
    2.  Git Support
    3.  REST API
    4.  Command line interface
    Bruno iconPostman Icon

    Bruno VS Postman

    Is Bruno a good alternative to Postman?
     
    Comments about Bruno as an Alternative to Postman
     
    Ola Johansson

    Looks nice, and like the simplicity with data just stored in a folder and you can sync it with git or Dropbox or whatnot.

    Positive comment •Oct 22, 2024
    0
    Guest

    Postman shut off his local client and forces you now to store your data in their cloud, also running your requests through their proxy.

    It also is quite a mess to colaborate on postman colections, if you don't want to use / pay for their cloud.

    With Bruno all that is not an issue at all - they work in a way which comes very natural to a developer and you can perfectly integrate your api test collections to your code repository.

    Positive comment •Nov 2, 2023
    2
    Blerkotron

    Lightweight, portable, very familiar UI for ex-Postman users.

    Positive comment •Feb 13, 2024
    1
    Postman Icon
    Bruno icon

    • Almost everyone thinks Bruno is a great Postman alternative.

    • Bruno is Freemium and Open SourcePostman is Freemium and Proprietary
    • Bruno is LightweightPostman is not according to our users
  7. Advanced REST Client icon
    Advanced REST Client icon

    Advanced REST Client

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

    65 Advanced REST Client alternatives
    Advanced REST Client screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS
    • AppImageHub
    • Google Chrome
    • Chromium
    Advanced REST Client screenshot 1
    Advanced REST Client screenshot 2

    Advanced REST Client Features

    1.  Full headers control
    2.  Electron based
    3.  Web tool
    4.  REST API
    5.  Sync with Google Drive
    6.  REST Client
    7.  API Testing
    Discontinued

    The latest version (17.0.9) is from March 2022.

    Advanced REST Client iconPostman Icon

    Advanced REST Client VS Postman

    Is Advanced REST Client a good alternative to Postman?
     
    Comments about Advanced REST Client as an Alternative to Postman
     
    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 •Dec 17, 2019
    2
    blur HY

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

    Positive comment •Sep 14, 2019
    3
    Guest

    The import request are so bad

    Negative comment •Aug 12, 2020
    0
    Postman Icon
    Advanced REST Client icon

    • Most users think Advanced REST Client is a great Postman alternative.

    • Advanced REST Client is Free and Open SourcePostman is Freemium and Proprietary
  9. Insomnium icon
    Insomnium icon

    Insomnium

     15 likes
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    Insomnium is a fast local API testing tool that is privacy-focused and 100% local. For testing GraphQL, REST, WebSockets and gRPC. This is a fork of Kong/insomnia.

    19 Insomnium alternatives
    Insomnium screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Windows
    • Linux
    • Mac

    Properties

    1.  Lightweight
    2.  Ad-free

    Features

    1.  Command line interface
    2.  REST Client
    3.  GraphQL API
    4.  Local Storage
    5.  REST API
    Discontinued

    The GitHub repository was archived in May 2024.

    Insomnium iconPostman Icon

    Insomnium VS Postman

    Is Insomnium a good alternative to Postman?
     
7 of 29 Postman alternatives