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Postman vs Scalar API Client: catalog facts
Postman	Scalar API Client
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Freemium The open-source client is free; the wider Scalar platform has commercial offerings.
Windows, macOS, Linux, Web, Browser extension	Web
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	Understands OpenAPI descriptions Open source on GitHub
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	The website focuses on the commercial docs and SDK platform rather than the client Most useful when an OpenAPI description exists
Downloadable app, Web application, Browser extension	Web application
Closed source	Open source
License not stated	License not stated
Account needed	Not stated if an account is needed
Needs internet	Not stated if it works offline
Official website Full listing and sources Checked September 21, 2026	Official website Full listing and sources Checked September 23, 2026

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