Browserling is based on StackVM. Testling is not. Edit: StackVM is this thing that puts VNC in your browser (see demo videos at www.stackvm.com). We used Stack

Browserling is based on StackVM. Testling is not. Edit: StackVM is this thing that puts VNC in your browser (see demo videos at www.stackvm.com). We used StackVM to build Browserling. We installed browsers on Windows and used StackVM code so that you can use those browsers in your browser. Now with Testling we only run browsers on Windows, without VNC. So when you write a test, we launch a browser on Windows and run the test in it, then we collect the test results and send them back to you.