Thanks for creating this! I just this morning started a test for a client using Ouibounce (another paid solution didn't have an effective Javascript API so we couldn't integrate it into the test).

I agree about the effectiveness of these (exit intent popups). I can see how they're perceived as annoying but having run many tests with these types of popups the numbers seem to support it. It is possible use them in a way that has value and isn't spammy.