From Appsolute Madness, Inc.:
Piano Keys enables you to customize your iOS keyboard, using our custom piano-themed buttons/keys, backgrounds and templates. Modify our templates by changing key colors, font styles and colors, and background colors, or upload a background image from your device's camera or gallery. Our custom theme relates to pianos, piano keyboards, keyboard instruments, and music symbols used by pianists and other musicians. Notes:For you to use your custom keyboard on your device, Piano Keys requires Full Access in Settings > General > Keyboard > Keyboards > Piano Keys. We respect your privacy and do not -- nor will we ever -- track anything you type or text. (When you update or upgrade Piano Keys, it may be necessary for you to toggle "Allow Full Access" off and then back on.)If you have multiple keyboards on your device, tap the globe icon to switch between keyboards, or press and hold the globe icon to open a menu of keyboards. Font selection will change the appearance of the letters on the keyboard, but it does not change the font in the body of the text messages you send.At this time, we do not support auto-cap, auto-correct or predictive text.