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Evans vs Buf Studio: catalog facts
Evans	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.
Command line	Web
Interactive REPL for exploring gRPC services Guided input of request fields	Sends gRPC and Connect requests from a browser Works with schemas in the Buf Schema Registry
gRPC only No graphical interface	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.