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Buf Studio vs Evans: catalog facts
Buf Studio	Evans
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	Command line
Sends gRPC and Connect requests from a browser Works with schemas in the Buf Schema Registry	Interactive REPL for exploring gRPC services Guided input of request fields
Limited to Protobuf-based APIs Few details on features or pricing in the available research	gRPC only No graphical interface
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.