An app for interactive alphabet learning

Imagine Learning teaches children how to write letters of the English alphabet. It is meant to be used by a young student who is learning how to write, but there appears to be a teachers-only area with no explanation for it being there. A child may gain some benefit from running through the exercises without a helper or teacher. The app is free to download and install, but developers should have made it more obvious that the app requires a paid server-service in order to function correctly.