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RESTer vs Postman: catalog facts
RESTer	Postman
Free Free browser extension.	Freemium A free tier covers individual use with limits on collaborators, collection runs and…
Browser extension	Windows, macOS, Linux, Web, Browser extension
Any HTTP method, headers and body Saved requests for reuse	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
Runs only inside the browser Fewer collaboration features than full API platforms	Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions
Browser extension	Downloadable app, Web application, Browser extension
Closed source	Closed source
License not stated	License not stated
No account needed	Account needed
Not stated if it works offline	Needs internet
Official website Full listing and sources Checked September 24, 2026	Official website Full listing and sources Checked September 21, 2026

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