How to use it
Follow the on-screen instructions several times and compare repeated attempts rather than one score.
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Tests
Color Vision Challenge
Find the subtly different tile and measure your color sensitivity.
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Find the different tile
TOOL GUIDE
When to use it
Content reviewed · 2026-07-23
Find the subtly different tile and measure your color sensitivity.
Before you rely on the result
Results can vary with the browser, operating system, display, and input device.
Data handling
Values are used only on the current screen and are not sent or stored separately.
Related tools
A few tools that fit naturally with this task.