This free app for Android simulates a blacklight with the screen of your smartphone or tablet. It is meant to be used as a general optical accent or to prank your friends.

It can be used as a source of UV rays to cause a temporary mutability of your skin or to cause a permanent change, depending on the dose.

The app also includes a control to turn on and off the UV tubes, which requires a simple click on the screen. To switch off the black light again, you must click one time more on an empty part of the Android app.