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Yaak vs Advanced REST Client: catalog facts
Yaak	Advanced REST Client
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free Free to download; the source is published on GitHub.
Windows, macOS, Linux	macOS
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	Dedicated desktop app for manual HTTP and REST testing Source code is public and the repository is still active
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	No releases published on the GitHub releases page License is not clearly identified in the repository metadata
Downloadable app	Downloadable app
Open source	Closed source
License: MIT	License not stated
No account needed	Not stated if an account is 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 2, 2026

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