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grpcurlYaak
Free

The open-source application is available without a license fee.

 Freemium

Yaak is MIT licensed and free to build and use. Development is funded by…

Windows, macOS, Linux, Command line Windows, macOS, Linux
  • Browse schemas and invoke RPC methods
  • 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
  • Servers without reflection require proto or protoset files.
  • 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
Not stated if an account is needed No account needed
Not stated if it works offline Works offline

Checked September 22, 2026

Checked September 21, 2026

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