Use this app to visually check your OLED screen if you have signs of "Image Persistence" or "Burn-In". Read about the best way to take care of it. When you want to buy/sell a (second-hand) iPhone with an OLED display, you can use this app to visually check for damage to the screen. This App does not claim to fix or repair an OLED screen which has Image Persistence, or burn-in. You can also enjoy two demo videos to check out how good looking Dolby Vision and HDR 10 are, on your iPhone OLED display. Recently we have added 4 Dolby Atmos tests for the Spacial Audio on the Air Pods Pro.