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Milkman vs Hello HTTP: catalog facts
Milkman	Hello HTTP
Free Free and open source.	Free Free and open source under the Apache 2.0 licence.
Windows, macOS, Linux	Windows, macOS, Linux
Plugins for REST, GraphQL, gRPC, Socket.IO and databases Git-based sync of collections	Supports HTTP, WebSocket, GraphQL subscriptions and gRPC Desktop app rather than a cloud service
Smaller community than mainstream API clients Documentation lives mainly in the repository	Built mainly around one developer's needs Smaller ecosystem than Postman or Insomnia
Downloadable app	Downloadable app
Open source	Open source
License not stated	License: Apache-2.0
No account needed	Not stated if an account is needed
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 October 2, 2026

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