Open Source Alternatives
Alternatives to Postman
API development and testing platform.
Postman is a trademark of its respective owner.
Updated Apr 2026
| Bruno | Insomnia | Hoppscotch | |
|---|---|---|---|
| Score | 17 | 11 | 11 |
| Overlap | 78% | 82% | 75% |
| Migration | trivial | trivial | trivial |
| License | MIT License | Apache License 2.0 | MIT License |
| Best for | Everyone | Everyone | Everyone |
Drop-in Replacements
Ranked by Discovery Score
Bruno
1778% coverageOpen source IDE for exploring and testing APIs
It's an API client that stores everything in plain text files on your filesystem. No cloud sync, no account required, no collections locked in a proprietary format.
Insomnia
1182% coverageCross-platform API client for REST, GraphQL, gRPC
Insomnia is a desktop API client for designing, debugging, and testing REST, GraphQL, gRPC, and WebSocket APIs, organized into collections. It's a workbench for APIs: REST, GraphQL, gRPC, and WebSockets all in one interface.
Hoppscotch
1175% coverageOpen source API development ecosystem
REST, GraphQL, WebSocket, SSE, MQTT, and Socket.IO all in one tab. Open it, start testing.
Building Blocks
Postman is a platform — it bundles multiple capabilities into one subscription. These tools each cover one piece. Teams often assemble 2–3 of them instead of paying for the full suite.
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Including when one of these alternatives ships a major update. Free.