Blue Screen
Display a full blue screen to detect stuck sub-pixels and check blue color uniformity on your display.
How does this test work?
A blue screen test fills your display with pure blue to help you detect stuck red or green sub-pixels and check blue channel uniformity.
How to use the Blue Screen
Open the Blue Screen on any device with a modern browser — desktop, laptop, tablet, or phone. No downloads, plugins, or signup required. The tool loads instantly and works in Chrome, Firefox, Safari, Edge, and other Chromium-based browsers.
Follow the on-screen instructions to run the test. Results are displayed immediately in your browser. You can repeat the test as many times as needed. For the most accurate results, close other tabs and applications to reduce interference.
Privacy: This test runs entirely in your browser using standard web APIs. No data is collected, uploaded, or stored on any server. Camera, microphone, keyboard, mouse, and controller inputs are processed locally and never leave your device. DeviceKit does not use analytics cookies or tracking scripts.
Browser note: Some hardware values are estimated because browsers limit direct access to device hardware for security and privacy reasons. Results may vary slightly between browsers and operating systems. For the most reliable measurements, use an up-to-date version of Chrome or Edge on a desktop computer.
Frequently Asked Questions
Why test with a blue screen?+
A full blue screen isolates the blue sub-pixel channel, making stuck red or green sub-pixels stand out clearly as off-color dots.
Related Tests
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Run a free dead pixel test in fullscreen. Check monitors, laptops, phones, tablets, and TVs for dead or stuck pixels using solid color screens.
Red Screen
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Green Screen
Display a full green screen to detect stuck sub-pixels and check green color uniformity on your display.
Screen Color Test
Cycle through solid colors to test your monitor, TV, or phone for dead pixels, stuck pixels, and color accuracy. Free fullscreen tool.