Postman AlternativesOnly Open Source apps categorised as API Clients - Page 3

The best open source API Client 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 are open source API Clients so hopefully you can find a suitable replacement. Other interesting open source API Client alternatives to Postman are HTTPie for Terminal, Hoppscotch, soapUI and Bruno.

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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 Dec 6, 2023
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  1. RESTer icon
    RESTer icon

    RESTer

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

    48 RESTer alternatives
    RESTer screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Google Chrome
    • Firefox

    RESTer Features

    1.  Command line interface
    2.  Project Organization
    3.  API Management
    4.  Variables
    RESTer screenshot 1
    RESTer screenshot 2
    RESTer iconPostman Icon

    RESTer VS Postman

    Is RESTer a good alternative to Postman?
     
    Comments about RESTer as an Alternative to Postman
     
    Guest

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

    Positive comment •Sep 13, 2018
    1
    Postman Icon
    RESTer icon

    • Almost everyone thinks RESTer is a great Postman alternative.

    • RESTer is Free and Open SourcePostman is Freemium and Proprietary
  2. WizTools RESTClient icon
    WizTools RESTClient icon

    WizTools RESTClient

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

    57 WizTools RESTClient alternatives
    WizTools RESTClient screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux

    WizTools RESTClient Features

    1.  REST Client
    WizTools RESTClient screenshot 1
    WizTools RESTClient screenshot 2
    Discontinued

    The project seems no longer developed. Last version, 3.7.1, released in December 2018, can be still downloaded from GitHub

    WizTools RESTClient iconPostman Icon

    WizTools RESTClient VS Postman

    Is WizTools RESTClient a good alternative to Postman?
     
  4. Stoplight icon
    Stoplight icon

    Stoplight

     12 likes
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    Stoplight is an API Design, Development, and Documentation platform that enables consistency, reusability, and quality, all with an easy, enjoyable developer experience.

    41 Stoplight alternatives
    Stoplight screenshot 1

    License model

    • Freemium • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online

    Stoplight Features

    1.  API Management
    Stoplight iconPostman Icon

    Stoplight VS Postman

    Is Stoplight a good alternative to Postman?
     
    Comments about Stoplight as an Alternative to Postman
     
    Guest

    simple ui get the response..!!!!

    Positive comment •Apr 1, 2017
    0
    Postman Icon
    Stoplight icon
    • Stoplight is Freemium and Open SourcePostman is Freemium and Proprietary
  5. Pororoca icon
    Pororoca icon

    Pororoca

     2 likes
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    A HTTP inspection tool with support for HTTP/2 and HTTP/3. Alternative to Postman.

    21 Pororoca alternatives
    Example HTTP request and response

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    Environments
    Repeaters
    +1
    Response captures

    Properties

    1.  Lightweight
    2.  Ad-free

    Features

    1.  Portable
    2.  HTTP Testing
    3.  SSL client certificates
    4.  API Testing
    5.  API Management
    6.  GraphQL
    7.  API Integration
    Pororoca iconPostman Icon

    Pororoca VS Postman

    Is Pororoca a good alternative to Postman?
     
  6. Hello HTTP icon
    Hello HTTP icon

    Hello HTTP

     1 like
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    A cross-platform HTTP client desktop application for testing HTTP and REST APIs, WebSocket, GraphQL (including subscriptions) and gRPC endpoints.

    12 Hello HTTP alternatives
    Hello HTTP screenshot 1

    License model

    • Free • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    Hello HTTP screenshot 1
    Hello HTTP screenshot 2

    Properties

    1.  Lightweight

    Features

    1.  Portable
    2.  Java based
    3.  GraphQL API
    4.  REST API
    5.  Websocket testing
    Hello HTTP iconPostman Icon

    Hello HTTP VS Postman

    Is Hello HTTP a good alternative to Postman?
     

  7. restclient.el

     2 likes
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    This is a tool to manually explore and test HTTP REST webservices. Runs queries from a plain-text query sheet, displays results as a pretty-printed XML, JSON and even images.

    51 restclient.el alternatives
    restclient.el screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • GNU Emacs

    restclient.el Features

    1.  REST API
    2.  REST Client
    3.  Variables
    4.  Web Testing
    5.  API Testing
    Postman Icon

    restclient.el VS Postman

    Is restclient.el a good alternative to Postman?
     
  9. Firecamp icon
    Firecamp icon

    Firecamp

     1 like
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    Firecamp's GraphQL playground is all in one GraphQL debugging tool which let you debug, collaborate and document your GraphQL APIs within a team for all platform.

    7 Firecamp alternatives
    Firecamp screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Online
    • Software as a Service (SaaS)
    • Self-Hosted

    Firecamp Features

    1.  Websocket testing
    2.  API Testing
    3.  GraphQL API
    4.  GraphQL
    Firecamp screenshot 1
    Firecamp screenshot 2
    Firecamp iconPostman Icon

    Firecamp VS Postman

    Is Firecamp a good alternative to Postman?
     
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