Doctor OLED X 4+

Mobile OLED screen toolbox

Robin Bollen

    • $0.99
    • Offers In-App Purchases

iPhone Screenshots


OLED displays have the highest contrast of any display panel. Blacks are pure black because OLED, which stands for Organic Light-Emitting Diodes, can switch off individual pixels.

iPhones with OLED screens should be handled with a bit of care to avoid image persistence or screen burn-in, if you treat your new iPhone with attention you will not suffer from this and your device will have a better resale value, see vendor support article HT208191.

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.

What’s New

Version 3.3

New Dolby Vision and HDR 10 videos.

Ratings and Reviews

4.3 out of 5
61 Ratings

61 Ratings

Dead_Ed ,

Does what it claims. (Dev: bug inside)

This app is a good screen tester. Don’t expect it to balance your checkbook - its a screen tester. It does that fine.

Developer: the button for “OLED & App Info” leads to a text display that’s both editable and a user trap. You can’t back out of it, apparently. Requires a force quit if you click anywhere and enter edit mode as the Exit button disappears in edit mode.

Developer Response ,

Indeed, good that you reported this bug, much appreciated, I will fix it in the next release.

Greg-_ ,

An awesome app to have for OLED displays

If you’re going to buy a phone with an OLED display, then this app is a great diagnostic tool to have when your checking your display for color consistency. The app will display a wide range of colors that makes it very easy to see if your OLED screen is displaying colors properly.

Also, I know it was a small thing for me to nit pick about, but thanks so much for removing the uninterruptible music that would play while the app was open. I love being able to play my own music in apps.

I’m giving this app the 5 stars that it rightfully deserves. Thanks for listening to feedback and being such an awesome dev! Keep up the good work! 👍

Developer Response ,

I’ve removed the music for the tests in version 1.4, which has been submitted today 09-11-2018, thanks for the useful feedback.

_WolfSpirit ,


This app doesn’t do much help. It doesn’t help fix or lessen the effects of anything. Just lets you check. Which isn’t helpful. And worse than that, I have a brand new iPhone XS and this app froze it so bad it needed a force restart. I accidentally tapped that “Dolby showcase” junk and my phone completely froze. Wouldn’t play the video, couldn’t close the app, use assistive touch, or even change volume or lock the phone. Do not even touch this app, there’s plenty of other apps that help diagnose and do basic things to help reduce effects of burn in and DON’T have unnecessary “features” that risk breaking your phone.

Developer Response ,

Hi _WolfSpirit, thanks for reporting your issue. I’m sorry that my app froze your iPhone. Unfortunately I cannot test on all physical iPhone models. I have removed the showcase videos in the new version 1.6.

I’m sure the app is useful especially for users that are not fortunate enough to buy a new OLED iPhone and that want to check the condition of the display.

May I restate that the app does all that is described in the app store, this has been challenged by the app approval team.

App Privacy

The developer, Robin Bollen, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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