This is the complete display check: a single guided flow that walks your screen through every test that matters, so you don’t have to run them one by one. It’s the fastest way to judge the health of any screen — a new iPhone you’re unboxing, a used iPad you’re about to buy, a refurbished Mac, or an external monitor.
The flow steps through solid colour fields to expose dead and stuck pixels, flat greys to reveal backlight uniformity and OLED retention, smooth gradients to show colour banding, and fine text and line patterns to judge sharpness and focus. Each step tells you what to look for. It runs entirely in your browser on any device, with nothing to install — and links out to our dedicated dead pixel, refresh rate, touch and burn-in tools when you want to dig deeper into one area.
How to use it
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1Prepare the screen
Set brightness high, disable auto-lock, and clean the display so smudges aren’t mistaken for faults.
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2Start the guided flow
Tap “Start full screen test”. Each step shows a test pattern with a short note on what a healthy screen should look like.
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3Advance through the steps
Tap to move forward: solid colours, greys, gradients, then sharpness patterns. Take your time on each — faults are subtle.
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4Finish and dig deeper
At the end you’ll see a summary. If one area looked off, open the matching dedicated tool for a closer, more thorough test.
Frequently asked questions
What does a full screen test check for?
This flow covers the four things that reveal display faults: solid colours (dead, stuck and hot pixels), flat greys (backlight uniformity and OLED image retention), smooth gradients (colour banding and bit-depth), and fine patterns (sharpness, focus and convergence). Together they give you a complete picture of a screen’s health in a couple of minutes.
Is this the best way to test a screen before buying?
Yes. Running one guided flow means you won’t forget a test, and the on-screen notes tell you exactly what a healthy result looks like. For a used iPhone, iPad or Mac, it surfaces the hidden defects — dead pixels, retention, dead touch zones — that are easy to miss and expensive to discover later.
Does the screen test work on all devices?
Yes. It’s built with a full-viewport overlay and pure web patterns, so it runs identically on iPhone, iPad, Mac and external monitors, in any modern browser. No app or download is required.
What should I do if I find a problem?
Open the dedicated tool for that area — the dead pixel test and fixer, the burn-in test and fixer, the touch screen test, or the refresh rate test — for a deeper, more focused check. Each one gives you more detail and, where possible, a fixer.