A free app for Android, by Yugel Mobile – Skril Studio.

Screaming Piano is a great app for annoying your friends and family. It features 16 male and female screaming voices, which is a lot. To begin the screaming fest, tap on the piano and use the in-game credits. If you consumed all your credits, you’ll need to watch a video to earn one. The credits are not offered as microtransactions, which makes Screaming Piano appealing to users on tight budgets. 

Although Screaming Piano is primarily used for pulling pranks, it’s not advisable to use it to wake up or disturb someone. Available on the Google Play Store, Screaming Piano works with Android devices with Android 4.4 and newer.