SoapUI is a cross-platform functional automation testing tool. SoapUI is free and open source tool and it has been designed to help test APIs such as SOAP and REST interfaces to ensure inter operability of different applications on apache web service tutorial It allows you to easily create and execute automated functional tests, regression and load tests. SoapUI has complete test coverage and supports all the standard protocols and technologies. SOAP-UI is not just the functional API testing tool but it also performs non-functional testing, such as performance test and security test.