Best of 2026
Best open-source API Tools
The 4 highest-scoring open-source API Tools on AppFinder, each with the facts behind its position.
Positions come from our organic score, led by people: community upvotes, visitor ratings and feedback, then how complete the listing is and how recently it was updated. Verification, Pro plans, team ratings and advertising are not inputs, and nothing paid can add an upvote. How ranking works
At a glance
- Ranked here
- 4
- Apps in API Tools
- 9
- With a free plan
- 4 of 4
Top 4 open-source API Tools
Ranked by organic score: upvotes and ratings from people. Payment never changes this order.How ranking works
Position 1
AI-ready APIs Built Smarter. Tested Faster. Governed Better
Why it’s here
- Includes API testing, Git hosting, Public API and 12 more
- Integrates with AWS
- Open source
- Available on Web, macOS and Windows
Position 2
Tired of slow, Electron-based API clients?
Why it’s here
- Includes API testing, Git hosting, Offline mode and 4 more
- Open source
Position 3
The local-first API client
Why it’s here
- Includes API testing, Git hosting, Offline mode and 12 more
- Open source
- Available on Web, macOS, Windows and Linux
Position 4
Open-source, offline-first API client
Why it’s here
- Includes API testing, Git hosting, Offline mode and 1 more
- Open source
- Available on macOS, Windows and Linux