WIA is on the money, give it away and load it up with ads.
99 cent model:
You make 70 cents after Apple fees and likely will not many anymore money unless you upsell them on future apps. Most people will avoid paying for apps unless it is amazing.
Freemium model:
0 earned upfront but if your app is popular people will use it everyday, even with a 1% or 2% CTR you will earn that 70 cents after only a few clicks. Instead of earning just once you have a nice little passive income and you can always upsell them on a premium version and make even more money.
99 cent model:
You make 70 cents after Apple fees and likely will not many anymore money unless you upsell them on future apps. Most people will avoid paying for apps unless it is amazing.
Freemium model:
0 earned upfront but if your app is popular people will use it everyday, even with a 1% or 2% CTR you will earn that 70 cents after only a few clicks. Instead of earning just once you have a nice little passive income and you can always upsell them on a premium version and make even more money.