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Yaak vs wscat: catalog facts
Yaak	wscat
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free Free and open source.
Windows, macOS, Linux	Command line
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	Interactive WebSocket sessions in the terminal Can act as a client or a listening server
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Requires Node.js and npm Plain text interface with no message history tools
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
No account needed	No account 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.