LifeHacker:

Apple added a few new things in the iOS 10.3 update, and one of those is a tool to identify 32-bit apps that may be rendered obsolete in the next version of iOS.

SensorTower compiled a list of the nearly 200,000 incompatible apps in the App Store and the bulk seem to be games or education apps.

Go to the linked web site to see how to check for iOS 11 incompatible apps. I’ve got several dozen apps that will break and some are ones I still use regularly.