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Yaak vs grpcurl: catalog facts
Yaak	grpcurl
Freemium Yaak is MIT licensed and free to build and use. Development is funded by…	Free The open-source application is available without a license fee.
Windows, macOS, Linux	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	Browse schemas and invoke RPC methods
A much younger project than Postman, with a smaller community No hosted collaboration features if that is what you actually want	Servers without reflection require proto or protoset files.
Downloadable app	Downloadable app
Open source	Open source
License: MIT	License: MIT
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 22, 2026

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