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Hello HTTP vs Milkman: catalog facts
Hello HTTP	Milkman
Free Free and open source under the Apache 2.0 licence.	Free Free and open source.
Windows, macOS, Linux	Windows, macOS, Linux
Supports HTTP, WebSocket, GraphQL subscriptions and gRPC Desktop app rather than a cloud service	Plugins for REST, GraphQL, gRPC, Socket.IO and databases Git-based sync of collections
Built mainly around one developer's needs Smaller ecosystem than Postman or Insomnia	Smaller community than mainstream API clients Documentation lives mainly in the repository
Downloadable app	Downloadable app
Open source	Open source
License: Apache-2.0	License not stated
Not stated if an account is needed	No account needed
Not stated if it works offline	Works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

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