Currently, I'm using this solution to test the API email applications
Usually, our clients are in IT. They have web services - more than 300 web services. We are calling those web services in our front-end applications. In order to verify the actual values from the web service, we use SoapUI to connect with the current client endpoint.
We like that we can do all manual testing for the API.
We can test as many APIs as we like.
It's very reliable and very easy to understand. Anyone can learn it very quickly.
The solution does not have major complications, it's a very simple tool. We can run projects in testing environments, and in production with the production data.
You can do end-to-end testing. You can also do security testing. You can create API projects. It's great in terms of usability.
The license for SoapUI is far better than Postman if you compare the two.
The initial setup is very easy.
The solution scales well.