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Open Source API Clients using Testing Library

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

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


    46,646
  • Last commit


    2 days 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:

Powerful API development and testing made effortless
  • Stars


    39,959
  • Last commit


    4 days 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:

Unified API development ecosystem for modern teams
  • Stars


    2,608
  • Last commit


    6 months ago
  • License


    AGPL-3.0
All-in-one platform for API testing, documentation, and collaboration, simplifying the entire API development lifecycle.

Open Source Alternative to:

Build APIs like code with Git-native workspace
  • Stars


    1,620
  • Last commit


    3 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:

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