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Yaak vs Scalar API Client: catalog facts
Yaak	Scalar API Client
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Freemium The open-source client is free; the wider Scalar platform has commercial offerings.
Windows, macOS, Linux	Web
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	Understands OpenAPI descriptions Open source on GitHub
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	The website focuses on the commercial docs and SDK platform rather than the client Most useful when an OpenAPI description exists
Downloadable app	Web application
Open source	Open 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 September 23, 2026

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