Harpion is a tiny app for a tiny musical instrument - harmonica (blues harp). It suits well for both, experienced harmonica players and beginners. You can use this app as a cheat-sheet when playing your real harp - it shows how notes are placed on your harmonica in the given key.
According to the antivirus report, Harpion is safe and secure. Trikita is the developer of the tool which can be found in the Music & Audio category. The average score for this application is 3.9 on Google Play.
Over 10K users downloaded and installed the app and its latest release was on May 7, 2015. A free .apk installation package of Harpion 2.2 is available from Droid Informer and you can have a look at users' reviews on this site. Prepare 1 MB of free space on your device for this app setup package and keep in mind that it requires Android 2.3.3 and above.