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Postman vs Milkman: catalog facts
Postman	Milkman
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Free Free and open source.
Windows, macOS, Linux, Web, Browser extension	Windows, macOS, Linux
The most widely used API client, so collections and tutorials for it are everywhere Collections with environments, pre-request and test scripts, and a built-in runner	Plugins for REST, GraphQL, gRPC, Socket.IO and databases Git-based sync of collections
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	Smaller community than mainstream API clients Documentation lives mainly in the repository
Downloadable app, Web application, Browser extension	Downloadable app
Closed source	Open source
License not stated	License not stated
Account needed	No account needed
Needs internet	Works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 24, 2026

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