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Yaak vs grpcui: catalog facts
Yaak	grpcui
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Web, 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	Browser forms for calling gRPC methods Postman-style workflow for gRPC rather than REST
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Covers gRPC only, not REST or GraphQL Launched from the command line rather than as a desktop app
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 September 23, 2026

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