Grammarly offers a mobile keyboard that allows you to access writing suggestions on Android and iOS devices.
All iOS devices running iOS 11.2 or newer are supported. You can install Grammarly for iOS on your device by following these instructions.
As for Android, Grammarly is compatible with all devices running Android 5.0 (Lollipop) or newer. Tablets are supported as well. To install Grammarly for Android, please follow the steps outlined here.
Additionally, Grammarly offers an option to access the Grammarly Editor directly from your iPad. Grammarly for iPad is supported on models running iOS 11.2 or newer, except for iPad Mini. You can learn more about how to install Grammarly for iPad here.