Differences between Restassured, Postman & SoapUI

Rest Assured

A Java code library, best suited for teams building fully automated, code-based API test suites integrated into CI/CD pipelines.

Postman

A GUI tool, best suited for manual/exploratory API testing, quick debugging, and lightweight automation via its JavaScript-based test scripts and the Newman CLI runner.

SoapUI

A GUI tool historically focused on SOAP web services (though it also supports REST), often used in enterprise environments that still rely on SOAP/XML-based services.

Choosing Between Them

Teams often use Postman for exploration and quick checks, then build a maintainable regression suite in Rest Assured (or another code-based framework) for CI/CD.