Hope this will be exciting news for you all. We are working on the visual regression feature on TestOps. You can capture screenshots in test cases and submit them to the TestOps server, where they will be compared with predefined baseline images and the differences will be highlighted. This function would also work with non-Katalon Studio tests.
We expect to roll out the first beta version in three weeks. Frankly, it will only have basic functions, but we are open for suggestions and requests from now.