Same shade?
Do grays on different backgrounds really match?
Reference
Adjust here
Match the shade, then reveal the answer
Global results
Submit to reveal everyone’s choices
How it works +
The left reference gray is 55%; the right side adjusts from 0–100%. Match them visually, then submit to reveal the error.
The global distribution shows chosen gray minus 55%. Background, display, ambient light and vision affect judgments. This is not a vision or color-perception diagnosis.
No registration. Everyone appears as “Anonymous”. Results update after successful submissions. Reloading does not erase shared history. The server stores participation records; the page shows recent entries.