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Nightingale vs Yaak: catalog facts
Nightingale	Yaak
Free Available from the Microsoft Store and GitHub releases.	Freemium Yaak is MIT licensed and free to build and use. Development is funded by…
Windows	Windows, macOS, Linux
Native Windows app that is light on resources Variables and environments	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
Windows only Smaller feature set than larger API platforms	A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 1, 2026	Official website Full listing and sources Checked September 21, 2026

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