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grpcui vs Yaak: catalog facts
grpcui	Yaak
Free Free and open source under the MIT licence.	Freemium Yaak is MIT licensed and free to build and use. Development is funded by…
Web, Command line	Windows, macOS, Linux
Browser forms for calling gRPC methods Postman-style workflow for gRPC rather than REST	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
Covers gRPC only, not REST or GraphQL Launched from the command line rather than as a desktop app	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
Open source	Open source
License: MIT	License: MIT
No account needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked September 23, 2026	Official website Full listing and sources Checked September 21, 2026

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