The latest info on Ryanair mobile apps
Ryanair provides an iOS app that is compatible with iPhone, iPod, and iPad.
For Ryanair Ryanair Airlines Frequent Flyer Program members, you'll be able to manage your account from the app, though using their website will no doubt provide more functionality
The Android apps from Ryanair work with all Android phones and tablets from various manufacturers (Samsung, LG, Google, etc.), and Android Wear watches might also be compatible. Perhaps standard practice these days, the Android app offers the same functionality as the iOS app from Ryanair.
Instead of downloading the mobile app, you can try visiting the mobile website of Ryanair to find flights and manage reservations. Click here for their website.