Find your app iOS 11 compatible?
Earlier in June 2017 was reported that Apple was dropping support for 32-bit applications altogether in iOS 11. In iOS 10, Apple displays a warning message and then allows the app to open, but in iOS 11, the app won’t open at all.
To check whether you currently have any 32-bit apps installed, go to Settings > General > About > Applications. If nothing happens when you tap Applications, you’re good. But if you have any 32-bit apps, they will be shown on the next screen.
For checking it you need install to iOS 11 public or developer beta
It makes sense to check before upgrading to iOS 11, so that you have time to find replacements apps.
According to Oliver Yeh, cofounder of app intelligence firm Sensor Tower, there are 187,000 32-bit apps still on the App Store, which equates to about 8% all iPhone apps (Sensor Tower estimated in March that there are approximately 2.4 million apps on the App Store). Source: Business Insider.