Use the Koch method to learn morse code. Each session, the app will play random morse code characters, and score you based on how accurately you transcribe them. The first lesson starts with only two letters, with each new lesson adding an extra character.
Although APK downloads are available below to give you the choice, you should be aware that by installing that way you will not receive update notifications and it's a less secure way to download. We recommend that you install the F-Droid client and use that.Download F-Droid