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Yaak vs Nightingale: catalog facts
Yaak	Nightingale
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free Available from the Microsoft Store and GitHub releases.
Windows, macOS, Linux	Windows
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	Native Windows app that is light on resources Variables and environments
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Windows only Smaller feature set than larger API platforms
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 1, 2026

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