AppOptix is an app that runs in the background of your phone and pays out in Amazon gift cards every time you reach 300 points. 300 points equals $10. You earn up to $50/year with it.
It is limited to one device per account. No limit to number of accounts per household. I use it and my wife uses it on her phone so we bring in $100/year with it. Once you’re account is approved, download the app and get started.