How to take the colour hue test
- Each row runs from a fixed colour on the left to a fixed colour on the right. The tiles in between are shuffled.
- Tap a tile, then another in the same row, to swap them. Arrange every row into a smooth gradient.
- Press Score my result. An error score of 0 is perfect; the hardest row shows where your colour discrimination is weakest. Share the result and challenge friends.
About hue discrimination
This test is inspired by the Farnsworth–Munsell 100 Hue test, used in industry and research to measure how finely people can tell similar colours apart. Your score depends on your eyes, but also heavily on your screen and surroundings: display calibration, brightness, night mode, blue-light filters and room lighting all change how colours look, so compare scores on the same device. Many people find the green to cyan and violet to red rows the hardest.
A high error score with a pattern concentrated in one part of the colour wheel can hint at colour vision deficiency, which affects around 1 in 12 men and 1 in 200 women, most commonly red–green. This page cannot diagnose it: if you are concerned, an optometrist can test you with calibrated equipment such as Ishihara plates or an anomaloscope. Everything runs in your browser.
What is a good score?
0 is perfect. Under 10 is excellent; most people score between 5 and 30 on a typical screen.
Can this test diagnose colour blindness?
No. Screens are not calibrated for clinical testing. See an optometrist for a proper assessment.
Why do my results change between devices?
Screens show colours differently. Brightness, colour profile and night-light settings all affect the result.