In fact, none of the apps I use regularly on my iPhone are available on Android.
Okay, so… Apollo for iOS wasn’t available on Android but it was far from the only android app for reddit available.
So you’ll have to explain what you mean. I find it hard to believe that there are apps on iOS that have functionality that doesn’t exist on Android. I can however definitely think of a few examples of what you’re talking about. In iOS I want able to find a way to interface with car maintenance software, or to connect to USB devices, or to visualize WiFi signal strength in AR. Or loading songs onto an SD card… or use wired headphones while charging my phone.