Postman AlternativesOnly Open Source apps categorised as API Clients - Page 4

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 Jul 11, 2024
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  1. Curlie

     2 likes
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    If you like the interface of HTTPie but miss the features of curl, curlie is what you are searching for. Curlie is a frontend to curl that adds the ease of use of httpie, without compromising on features and performance.

    24 Curlie alternatives
    Curlie screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • BSD

    Curlie Features

    1.  Command line interface
    2.  REST API
    3.  REST Client
    4.  Web Testing
    5.  Data transfer
    Postman Icon

    Curlie VS Postman

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  2. httpYac Rest Client icon
    httpYac Rest Client icon

    httpYac Rest Client

     1 like
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    Used httpyac CLI tool underneath, which helps you execute _.http and _.rest files. This can be used to quickly execute a single *.http file, but also to execute all files in a folder. httpyac supports HTTP, Rest, GraphQL, WebSocket und gRPC...

    45 httpYac Rest Client alternatives
    httpYac Rest Client screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    • Chrome OS

    Properties

    1.  Ad-free
    2.  Lightweight

    Features

    1.  Command line interface
    2.  REST Client
    httpYac Rest Client iconPostman Icon

    httpYac Rest Client VS Postman

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  4. Loadmill icon
    Loadmill icon

    Loadmill

     5 likes
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    Loadmill helps developers easily create the tests required for continuous delivery by analyzing user behavior. Loadmill automates backend regression testing by replaying real user behavior. Through the use of smart recordings, the platform can create and replay thousands of...

    14 Loadmill alternatives
    Code, record, debug and run tests with a complete development environment in your browser

    License model

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Software as a Service (SaaS)

    Loadmill Features

    1.  Load testing
    2.  Import API test from HAR
    3.  API Testing
    4.  Regression testing
    Record complex user flows and replay them as API tests— Loadmill will automatically extract tokens, credentials, and entity Ids into parameters. Our advanced algorithmic approach enables the unique ability to "understand" and automatically convert backend/API recordings to code that mirrors the full cycle of a real customer journey.
    Loadmill will scan your application and analyze user flows to create API tests for you automatically. Our algorithm will automatically map the relationship between back-end services and user behavior, exposing previously unknown user flows and service dependencies.
    Loadmill iconPostman Icon

    Loadmill VS Postman

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

    It detects parameters in network recordings automatically

    Positive comment •Dec 18, 2019
    1
    rivi

    It can generate API test automatically from your traffic so you get fully regression coverage with minimum effort

    Positive comment •Jan 10, 2020
    1
    ayalakr

    I used it to transform HAR and GOR files into test suites very easily

    Positive comment •Jan 14, 2020
    1
    Postman Icon
    Loadmill icon
    • Loadmill is Paid and Open SourcePostman is Freemium and Proprietary
  5. Requester icon
    Requester icon

    Requester

     4 likes
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    HTTP client plugin for Sublime Text with an expansive feature set, modern UX, elegant syntax and first class support for testing.

    41 Requester alternatives
    Requester screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux

    Requester Features

    1.  Debugging
    2.  REST API
    Requester screenshot 1
    Requester screenshot 2
    +1
    Requester screenshot 3
    Requester iconPostman Icon

    Requester VS Postman

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  6. Lama2 icon
    Lama2 icon

    Lama2

     2 likes
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    Lama2 defines the human-friendly l2 syntax and CLI for describing and executing APIs. Store your APIs in plain-text files. Collaborate with team using version control (say, git). Run Lama2 directly from VSCode extension. Think of Lama2 as Markdown for APIs.

    56 Lama2 alternatives
    Lama2 screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Mac
    • Windows
    • Linux
    Lama2 screenshot 1

    Properties

    1.  Lightweight

    Features

    1.  Command line interface
    2.  Portable
    3.  VSCode
    4.  Plain text file
    5.  Suggests DSL format
    6.  Code generation
    7.  Extensibility
    8.  Request Chaining
    Lama2 iconPostman Icon

    Lama2 VS Postman

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  7. Posting

     1 like
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    The modern API client that lives in your terminal.

    61 Posting alternatives
    Posting screenshot 1

    License model

    • Free • Open Source

    Application types

    Platforms

    • Python
    • BSD
    • Linux
    • Mac
    • Windows

    Posting Features

    1.  Command line interface
    2.  REST Client
    3.  SSH
    4.  Python-based
    5.  REST API
    Postman Icon

    Posting VS Postman

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  9. Apiman icon
    Apiman icon

    Apiman

     4 likes
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    apiman is an open source API management layer that streamlines repetitive tasks often required when providing an API, such as implementing security, throttling and billing.

    27 Apiman alternatives

    License model

    • Free • Open Source

    Application type

    Platforms

    • Mac
    • Windows
    • Linux
    • Online
    • Self-Hosted

    Apiman Features

    1.  API Management
    Apiman iconPostman Icon

    Apiman VS Postman

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