Hoppscotch
Sleek, intuitive API development and testing platform
Sleek, intuitive API development and testing platform
Bruno
Git-friendly API client — collections as plain text files.
MIT-licensed alternative to Postman with native desktop app, bru markup language, and version control built in. No cloud sync required.
Voiden API Client
Offline, Git-native API client — Markdown specs, zero cloud lock-in.
Apache 2.0 alternative to Postman. Design, test, and document APIs in `.void` Markdown files — composable blocks, no accounts, no telemetry.
Compare Insomnia alternatives
| Tool | Stars | Forks | License | Self-hosted |
|---|---|---|---|---|
| Hoppscotch | 79.4K | 5.9K | MIT | Yes |
| Bruno | 44.6K | 2.5K | MIT | Yes |
| Voiden API Client | 1.1K | 42 | Apache 2.0 | Yes |
Insomnia's desktop app is itself open source (Apache-2.0) under Kong, but its cloud sync and team collaboration features are a separate, closed, paid service — so for teams wanting real-time collaboration on API collections without relying on Kong's hosted sync layer, fully open alternatives are worth a look.
Hoppscotch is the closest match to Insomnia's general REST/GraphQL client workflow. Bruno and Voiden API Client both store collections as local files meant to be committed to Git, which is the better fit if you want to version and share collections without any cloud sync service at all.
FAQ
Is there a free, open-source alternative to Insomnia?
Yes. Hoppscotch, Bruno, and Voiden API Client are all open source and free to self-host or run locally.
What's the best open-source alternative to Insomnia?
Hoppscotch is closest to Insomnia's general client workflow. Bruno and Voiden API Client are the better pick if you want to keep API collections in Git rather than relying on any cloud sync.
What are the top open-source alternatives to Insomnia?
Browse all open-source alternatives to Insomnia above, or explore the full Developer Tools category for more options.