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Open Source API Clients using nvm

A curated collection of the best open source client applications for interacting with and testing APIs. using nvm.

Bruno

Lightweight, fast, and open-source API client for developers

  • Stars

    47,957

  • Last commit

    18 hours ago

  • License

    MIT
A modern, user-friendly API client that simplifies API testing and development with a clean interface and powerful features.

Open Source Alternative to:

Postman

Insomnia

Powerful API development and testing made effortless

  • Stars

    40,105

  • Last commit

    4 hours ago

  • License

    Apache-2.0
Intuitive API client for REST, GraphQL, and gRPC. Debug, test, and collaborate on APIs with ease across platforms.

Open Source Alternative to:

Postman

Yaak

Fast, secure, offline API client with Git integration

  • Stars

    19,393

  • Last commit

    1 hour ago

  • License

    MIT
A modern API client offering local-only data storage, Git integration, plugin extensibility, and multi-protocol support for developers.

Open Source Alternative to:

Postman

Requestly

Intercept, modify, and debug HTTP(S) requests effortlessly

  • Stars

    6,758

  • Last commit

    22 hours ago

  • License

    AGPL-3.0
A powerful browser extension and desktop app for developers to manipulate network requests, debug APIs, and improve web app testing

Open Source Alternative to:

Postman

Voiden

Build APIs like code with Git-native workspace

  • Stars

    Stars growing over the last 30 days1,967

  • Last commit

    2 days ago

  • License

    Apache-2.0
Offline-first API workspace that unifies specs, docs, tests, and mocks in programmable Markdown blocks. Version control everything in plain text files.

Open Source Alternative to:

Postman
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