This hits too close to home.

I built an app for micro-journaling [0] in 2013. I think the iOS version stopped working in 2016, the Android version maybe a year or two after (I switched to iPhone so don't know for sure).

The interactive demo site I built in JS?

Still works exactly the same.

And I tried to make the apps as backwards compatible as possible.

Maybe AI could help make OS upgrade maintenance easier?

[0]: www.ifeelio.com