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Postman vs Yaak: catalog facts
Postman	Yaak
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Freemium Yaak is MIT licensed and free to build and use. Development is funded by…
Windows, macOS, Linux, Web, Browser extension	Windows, macOS, Linux
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	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
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Open source
License not stated	License: MIT
Account needed	No account needed
Needs internet	Works offline
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.