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Yaak vs Resonance: catalog facts
Yaak	Resonance
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Linux
Requests are stored as files on your machine, so a git repository is the shared collection REST, GraphQL, gRPC, WebSocket and Server-Sent Events in one client	No account, cloud sync or telemetry Collections stored as plain YAML files
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Younger and smaller than Postman or Insomnia No built-in sync for sharing collections across a team
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	No account needed
Works offline	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked October 1, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.