I ask because this was my experience: I just tried to download the app on my iPhone 4s and I couldn't download it because my iOS version is too old. My Nexus 5, obviously, won't be able to download it either because it's an Android device.
Unless you're doing something majorly different in native than you are in the web version, I don't understand the iOS lock-in and the need to have the most recent iOS version. I mean, I do get it from a developers point of view...it's less devices to test...but it comes at the cost of a lot of people not being able to use it.