Blue Screen
A pure blue screen for testing blue subpixels and inspecting a panel closely. Blue fields make backlight bleed, clouding, and dead blue subpixels especially easy to see. Set the exact shade from the controls or use it as a calm, cool light.
What you can use it for
- Test blue subpixels and look for dead or weak spots
- Reveal backlight bleed and clouding, which show clearly on blue
- Judge color uniformity from edge to edge
- Cast a cool blue glow for ambience
How it works
- 1. Customize. Open the Customize panel to set text, colors, theme, and animation speed to your liking.
- 2. Go fullscreen. Click Fullscreen for an immersive, distraction-free display on any screen.
- 3. Done. No login, no install, nothing to download — it runs instantly in your browser and your settings are remembered.
Frequently asked questions
What does a blue field reveal?+
Backlight bleed, IPS glow, and clouding tend to be most visible on a deep blue or black field, and dead blue subpixels stand out against it.
Can I change the shade of blue?+
Yes. Pick any exact blue, or any other color, with the color picker in the controls.
More display & light tools
White Screen
Fill your whole display with pure white in one click.
Black Screen
Turn your whole display solid black in one click.
Red Screen
Fill the display with solid red to test color and pixels.
Green Screen
Fill the display with solid green for color and pixel checks.
Gradient Background
A still, fullscreen color gradient from curated palettes.
Zoom Light
Use your screen as an adjustable key light for video calls.
Selfie Light
A bright, adjustable fullscreen light for selfies and makeup.
Warm Light
A soft, warm fullscreen light that's easy on the eyes.
Cool Light
A crisp, cool daylight fullscreen light for focus and photos.