ArtRage for iPad version 2.2.0 has just been released, and it is now 'ArtRage for iOS', available universally for iPhones and iPads. This means that anyone who already owns the app can install it on their iPhone as well for free. If you own the old iPhone app, but do not own the iPad app, you would need to purchase the full app to access the entire range of tools and features. It also supports 3D Touch on iPhones with this feature, which allows pressure sensitive finger drawing without a stylus.

The old iPhone/general iOS app has been discontinued and is no longer available for sale, but existing owners can continue using it on their devices.

Learn more:
https://www.artrage.com/artrage-ios/
https://www.artrage.com/ipad-universal-app/