If you don't know exactely which AJAX toolkit you are using, read the following technical FAQ.
Further information - also regarding JDK-/SWT-/Browser-versions - can be found in the installation chapter of the Manual.
Special out-of-the-box integrations are available for the following test management products:
The tool price of QF-Test in comparison to Selenium is just a small part of the test project costs. The main factor is manpaower. So the effectivity of implementing and maintaining tests is playing a decisive role. And QF-Test already has maintenance, support, further development, bug fixes etc. included.
All mentioned aspects also apply for derivates of Selenium as Protractor for Angular.