My app makes roughly around $1K/month. A simple utility to backup(free) and restore(paid, in-app purchase) mobile phone contacts.
Check it out: http://c2x.eastros.com/
I only know for Android since that's the only mobile OS I have ever used so excuse my question if it sounds stupid:
Why should I pay for your app if Android has a built-in backup/restore system for contacts? Or does this work by creating backups periodically in case you accidentally delete a contact you might not have wanted to?
Good question, and there are couple of reasons why people buy the import feature.
(1) If you are switching from Android to iOS or vice verse, app can make the contact transfer process very simple and convenient.
(2) People like you and me can find very easy ways to transfer contacts, but there are a lot of non technical people who don't know about auto backup and restore features.
Why should I pay for your app if Android has a built-in backup/restore system for contacts? Or does this work by creating backups periodically in case you accidentally delete a contact you might not have wanted to?