We now have a new version of LineLearner in development. Lots of exciting new features are going into it, as well as some fixes to the navigation. It will be initially launched for iOS, and then an Android version should follow on shortly afterwards.
Some people have asked why Android always comes out after the iOS version, and the simple reason is that the development environment for Android is much harder to use, so I like to get the app sorted so that I know what it is doing in iOS, and then just copy it across into Android.