I released a number of successfully apps on the App Store a few years back. Some of my apps were featured by Apple. My apps made me a boatload of cash ($500k+) back in the App Store gold rush days.

I have not had the time to update any of my apps but I'm still passively making around $60 a day between 13 apps on two app accounts. All of my apps are paid (no in-app purchases / no ads).

My apps are mostly educational.

$60 a day of passive income on products I haven't touched in over two years even surprises me.

I plan on getting back into the app game next month. I'm setting aside time to update all of my apps and do some marketing.