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Postman vs SoapUI Open Source: catalog facts
Postman	SoapUI Open Source
Freemium A free tier covers individual use with limits on collaborators, collection runs and…	Free The open source edition is free; the commercial ReadyAPI product is paid.
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	Strong SOAP and WSDL support Functional test suites with custom scripting
Built around a cloud workspace, and an account is effectively required Offline and local-only use has become harder over successive versions	GraphQL, gRPC and CI integrations are reserved for paid ReadyAPI Website heavily promotes the commercial product
Downloadable app, Web application, Browser extension	Downloadable app
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.