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Buf Studio vs grpcui: catalog facts
Buf Studio	grpcui
Free Used on the Buf website; check Buf for current terms of the wider Schema Registry.	Free Free and open source under the MIT licence.
Web	Web, Command line
Sends gRPC and Connect requests from a browser Works with schemas in the Buf Schema Registry	Browser forms for calling gRPC methods Postman-style workflow for gRPC rather than REST
Limited to Protobuf-based APIs Few details on features or pricing in the available research	Covers gRPC only, not REST or GraphQL Launched from the command line rather than as a desktop app
Web application	Downloadable app
Closed source	Open source
License not stated	License: MIT
Not stated if an account is needed	No account needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 23, 2026

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