01
White Screen
Fills your entire screen with solid white. Cleaning the screen, spotting dust and dark…
Cyan Screen
Fills your entire screen with solid cyan. Testing green and blue together, which often exposes image retention on OLED panels.
Screen Tests
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Free, unlimited
Press Fullscreen, then look closely at the whole panel.
In short
A cyan screen lights the green and blue sub-pixels together while leaving red completely off, and that combination is unusually good at revealing image retention on OLED panels. A ghost of previously displayed static content — a taskbar, a channel logo, a game HUD — shows against cyan when white hides it entirely, which is why cyan is one of the two fields recommended for a burn-in check alongside mid grey. It also exposes red sub-pixel faults from the other direction: a pixel stuck on in red appears as a bright warm dot in a field that contains no red at all, making it far more obvious than it would be against white. For LCDs, cyan is a reasonable secondary uniformity field, though grey remains better. If you are checking a television or an OLED phone for retention, run cyan and grey and give each a few seconds — retention is often faint and takes a moment to pick out, and it fades once the content changes, which is precisely what distinguishes it from permanent burn-in.
How to use the Cyan Screen
- The test starts on its own — no button to press and nothing to install.
- Follow the prompt in the test panel and watch the readings update live.
- Press Reset to start over with a clean slate.
About the Cyan Screen
The Cyan Screen fills your entire screen with solid cyan. Testing green and blue together, which often exposes image retention on OLED panels. It runs as plain JavaScript inside the page, which means there is no upload step, no queue and no size limit imposed by a server — the only limit is your own device.
What people use it for
- Testing green and blue together, which often exposes image retention on OLED panels.
- Checking a monitor or phone screen before a return window closes.
- Using as a plain backdrop for photography or for cleaning the screen.
Press Fullscreen above before judging anything. A colour patch surrounded by page furniture tells you very little — the panel needs to be filling the whole screen, ideally in a dark room, with any night-light or blue-light filter switched off.
Frequently asked questions
What is the difference between a dead and a stuck pixel?
A dead pixel receives no power and stays black on every colour. A stuck pixel is latched on and shows the same bright red, green or blue dot against every background. Stuck pixels sometimes recover; dead ones never do.
How do I tell a dead pixel from dust?
Dust sits on the outside of the glass and moves or disappears when you wipe the screen with a microfibre cloth. A dead pixel does not move and stays in exactly the same position on every colour.
How many dead pixels before I can return a monitor?
That depends on the manufacturer's policy, which is usually written against the ISO 9241-307 pixel fault classes. Most consumer panels are sold to a standard that tolerates several sub-pixel faults, so check the specific warranty terms — and photograph what you find while the panel is still within the return window.
Are there any usage caps on the Cyan Screen?
No charge and no sign-up. There is no free tier to run out of because there is no paid tier — inputtesthub.com is funded by advertising rather than by metering the page.
Is the Cyan Screen safe to use with private information?
No. The Cyan Screen runs entirely in your browser using JavaScript. Because the work happens locally, the page also keeps working if your connection drops, and closing the tab is all it takes to discard everything.
When would I actually need the Cyan Screen?
In practice it gets used for three things: testing green and blue together, which often exposes image retention on OLED panels. Checking a monitor or phone screen before a return window closes. Using as a plain backdrop for photography or for cleaning the screen. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
Is there anything to watch out for?
Press Fullscreen above before judging anything. A colour patch surrounded by page furniture tells you very little — the panel needs to be filling the whole screen, ideally in a dark room, with any night-light or blue-light filter switched off.
Does the Cyan Screen need an app or a driver?
No installation, no extension and no driver. The Cyan Screen uses the browser's own device APIs and begins as soon as the page loads, so there is nothing to press first. Press Reset at any point to start over with a clean slate.
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