“After a lot of experimentation, what I've found is a real unlock is for people who just tap on the close button — the app starts at a reverse trial. So if I close it just now it says 'enjoy a week of Pro on us' and now you have 7 days free trial of all the Pro features starts without you having to pay or without you having to make any kind of commitment.”

Reverse trial: tapping "close" on the paywall silently grants 7 days of Pro

Instead of dumping paywall-rejecters into the free tier, Mumigo auto-activates a 7-day Pro trial with no card required when users tap close. They experience the full premium product before being asked to pay, dramatically widening the top of the conversion funnel. John names this as the single biggest unlock from his paywall experimentation.