Purple Screen
A plain purple screen. Go full screen, then press Esc to come back.
Look over the whole screen for dots that stay a different color.
Use your monitor or phone controls to raise the brightness. To come back, press Esc or click Exit full screen.
Ready.
Every test runs inside your browser. Nothing you type, say, show or press is uploaded.
How to use this test
A full-screen purple page for checking a display for stuck pixels and uneven tint, or for use as a backdrop.
Press Go full screen and inspect the display. Press Esc or click Exit full screen to return.
What the results mean
Purple uses the red and blue sub-pixels, so a dot that looks wrong here but is fine on green points to one of those two. Uneven purple across the panel is a tint or uniformity issue.
Common questions
Why would I use purple rather than red or blue?
Testing a mixed color checks two sub-pixels at once and shows how evenly the panel blends them, which pure colors can't.
The purple flickers slightly.
Some displays use pulsed backlights at low brightness. Raise the brightness; if the flicker stops, it's the backlight dimming method, not a fault.
Is this the same as the violet test in some monitor tools?
Close enough for a visual check. Both mix red and blue; the exact shade doesn't matter for spotting defects.