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Yaak vs Postman: catalog facts
Yaak	Postman
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Freemium A free tier covers individual use with limits on collaborators, collection runs and…
Windows, macOS, Linux	Windows, macOS, Linux, Web, Browser extension
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	The most widely used API client, so collections and tutorials for it are everywhere Collections with environments, pre-request and test scripts, and a built-in runner
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions
Downloadable app	Downloadable app, Web application, Browser extension
Open source	Closed source
License: MIT	License not stated
No account needed	Account needed
Works offline	Needs internet
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 21, 2026

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