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White Screen
Fills your entire screen with solid white. Cleaning the screen, spotting dust and dark…
Purple Screen
Fills your entire screen with solid purple. A dark saturated field, useful for checking colour blotching on VA panels.
Screen Tests
Nothing uploaded
No sign-up
Free, unlimited
Press Fullscreen, then look closely at the whole panel.
In short
A purple screen is a dark saturated field combining red and blue at lower brightness, and dark saturated fields are exactly where VA panels show colour blotching most clearly. If the field looks mottled or patchy rather than even, that is the panel's characteristic rather than dirt on the glass — VA technology trades its excellent contrast for less uniform behaviour in dark saturated colours, and this is where that shows. It is also a useful field for judging black-level consistency on an OLED, since a dark purple sits close enough to black to expose variation without being so dark that nothing is visible. Because the field is dim, it is comfortable to view in a dark room, which is where uniformity should be judged in any case. If you are looking for stuck pixels rather than blotching, black is the better field — a bright dot against near-black is unmistakable, while against purple a stuck blue or red pixel partly blends in.
How to use the Purple 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 Purple Screen
The Purple Screen fills your entire screen with solid purple. A dark saturated field, useful for checking colour blotching on VA 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
- A dark saturated field, useful for checking colour blotching on VA 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.
Is there a limit on how often I can use the Purple Screen?
Free, unlimited, and no email address required. You can use it a hundred times a day and nothing changes.
Is the Purple Screen safe to use with private information?
No. The Purple Screen runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What is the Purple Screen used for?
The jobs it is built for: a dark saturated field, useful for checking colour blotching on VA 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.
Why does the test start on its own?
No installation, no extension and no driver. The Purple 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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