1, 2 and 4 are much more consumer focused. That's honestly a better way to go in terms of user/product alignment. Ads or Affiliate offers are things customers

1, 2 and 4 are much more consumer focused. That's honestly a better way to go in terms of user/product alignment. Ads or Affiliate offers are things customers don't want, and they make it more likely people will pick a different app. Whatever you do, you'll have an easier time getting people to pay small amounts if you compare the amounts to something people buy everyday, like a vending machine candy bar, a 6 pack of soda, or a large pizza. People won't give you 20 bucks normally, but if they feel like they are paying for a pizza, they are much more likely to do so. Do the Donate button now and then consider a paid PRO version. Keep track of who donated so you can give them a free key to the pro version. If you do do donations, offer access to a special donation mailing list with voting for features, and prioritize them for bug reporting.