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Buf StudioInsomnia
Free

Used on the Buf website; check Buf for current terms of the wider Schema Registry.

 Freemium

Free to use, with a free account unlocking most features. Kong sells paid plans for teams…

Web Windows, macOS, Linux
  • Sends gRPC and Connect requests from a browser
  • Works with schemas in the Buf Schema Registry
  • REST, GraphQL, gRPC, WebSockets and Server-Sent Events in one client
  • Local Vault and Git Sync mean the cloud is optional
  • Limited to Protobuf-based APIs
  • Few details on features or pricing in the available research
  • Most features expect an account, even though a Scratch Pad works without one
  • The 2023 move to account-first storage cost it a lot of goodwill
Web application Downloadable app
Closed source Open source
License not stated License: Apache-2.0
Not stated if an account is needed No account needed
Needs internet Works offline

Checked October 2, 2026

Checked September 21, 2026

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