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

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