Forgot to mention two more options I had thought about: 1. Offer a free trial, then ask for a subscription. No ads, and shows you the power of the app before h

Forgot to mention two more options I had thought about: 1. Offer a free trial, then ask for a subscription. No ads, and shows you the power of the app before having to pay. 2. Limit the number of purchases you can log per day. Casual users don't pay, more active users need to subscribe.