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Warthog vs grpcui: catalog facts
Warthog	grpcui
Free Free to download from GitHub.	Free Free and open source under the MIT licence.
Windows, macOS, Linux	Web, Command line
Automatic parsing of proto definitions into input forms Several authentication methods, including JWT and GCE	Browser forms for calling gRPC methods Postman-style workflow for gRPC rather than REST
gRPC only, no REST or GraphQL Small project with a small user base	Covers gRPC only, not REST or GraphQL Launched from the command line rather than as a desktop app
Downloadable app	Downloadable app
Closed source	Open source
License not stated	License: MIT
No account needed	No account needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 23, 2026

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