Two comments: your app didn’t work on my iPhone, and using the dot/dash notation is generally acknowledged to be inferior to using (e.g. dahdidah) sound pattern

Two comments: your app didn’t work on my iPhone, and using the dot/dash notation is generally acknowledged to be inferior to using (e.g. dahdidah) sound patterns. (It looks like you’re using didahdit .-. for “K”, but that’s ”R”. I couldn’t get the following page to do anything, so I couldn’t check further.) A good app that’s in the iOS store is Ham Morse, which uses the famous Koch method to teach code.