All of these apps are available for Android devices. I haven’t been compensated for my reviews, I just want to share what apps are out there. See more categories under menu Android App Reviews.
Piano Tech Pro (free) ✰✰✰
This app is meant more for piano technicians. You can look up some piano manufacturers and see what year an instrument was made by the serial number. It only has a few manufacturers so don’t be disappointed if yours isn’t there. This was very interesting to me.
The other options show installation/care instructions for automatic humidity controls for pianos.