Morse Mentor is completely free from version 27 onwards. All features have been unlocked and ads have been removed.
Unlocked features include the ability to practice an unlimited length of time, to play the lesson in the background while using other apps and to switch to a dark theme.
Making it free allows everyone to take advantage of Morse Mentor's features, esp. for educational institutions and hobbyists.
It also makes it easier to maintain the app on the Google Play Store so it can be available on the Play Store for as long as possible.
For newer versions of Morse Mentor, the Pro licence app is no longer required to access Pro features. To gain access to all features, just use Morse Mentor as usual.
However, for older versions of Morse Mentor, the Pro licence app is still required to access Pro features. In this case, you can download the Pro licence app for free from the Play Store. The Pro licence app is now completely free as well.
Thank you very much to everyone who supported Morse Mentor in the past by upgrading to Pro :)