Open Source API Clients using CSS
A curated collection of the best open source client applications for interacting with and testing APIs. using CSS.
Sleek, intuitive API development and testing platform
Stars
80,064Last commit
11 hours agoLicense
MIT
Lightweight, fast, and feature-rich API client for developers. Test, debug, and document APIs with ease in a clean, modern interface.
Open Source Alternative to:
Lightweight, fast, and open-source API client for developers
Stars
46,433Last commit
12 hours agoLicense
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
39,957Last commit
11 hours agoLicense
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:
Fast, secure, offline API client with Git integration
Stars
19,095Last commit
11 hours agoLicense
MIT
A modern API client offering local-only data storage, Git integration, plugin extensibility, and multi-protocol support for developers.
Open Source Alternative to:
Intercept, modify, and debug HTTP(S) requests effortlessly
Stars
6,751Last commit
17 hours agoLicense
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:
Unified API development ecosystem for modern teams
Stars
2,607Last commit
6 months agoLicense
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
1,507Last commit
20 hours agoLicense
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:
Docmost – Open-source wiki software with real-time collaboration, diagrams, AI, SSO, RBAC permissions and more.
Docmost