Color Blindness Test
A quick Ishihara-style color-vision screening. For fun and awareness.
Color Vision Screening
An Ishihara-style mini-test. You'll see 8 plates of colored dots, each hiding a number. Type the number you see — or tap Can't see one.
Your best so far:
What number do you see?
⚕️ This is an approximate, screen-based screening for fun and awareness only — colors vary by device. It is not a medical test. For a real diagnosis, see an optometrist or ophthalmologist.
Best score:
Why you’ll love Color Blindness Test
Instant & free
No signup, no paywall, no limits — Color Blindness Test works the moment the page loads.
Completely private
Everything runs in your browser. Nothing you enter is ever uploaded or stored on a server.
Works on any device
Fully responsive and touch-friendly — use it on your phone, tablet or desktop.
Uses your real device
Taps into your actual camera, mic or motion sensors — right in the browser.
How to use it
Open it
No download and no login — the tool is ready right at the top of this page.
Use it
Enter your details or start interacting. Everything updates live as you go.
Get your result
Copy, download or share your result in a single tap. That’s it.
About Color Blindness Test
This screening works the same way as the classic Ishihara plates used by eye doctors since 1917. Each plate is a circle of coloured dots hiding a number. The trick is that the number differs from the background only in hue — the dot sizes and lightness are deliberately randomised — so the digit is only readable if your eyes can separate those particular red and green hues. Typical (trichromatic) colour vision reads it instantly; red-green deficient vision sees a fairly uniform field of dots.
You get 8 plates: one control plate that everyone should read, plus seven red-green plates drawn fresh on a canvas each run, with the deck shuffled and every dot placed randomly. That means no two runs look identical and the answers cannot be memorised. Type the number you see, or tap "I can't see a number", and at the end you get a verdict based on how many red-green plates you read, along with a per-plate recap of your answers.
Red-green colour vision deficiency is by far the most common type, affecting roughly 1 in 12 men and 1 in 200 women because the responsible genes sit on the X chromosome. Most people who have it live perfectly normal lives — many only discover it through a screening like this. Remember this is a fun, screen-based awareness check, not a diagnosis: monitors reproduce colour differently, so a proper assessment needs an optometrist and printed plates under controlled lighting.
Popular uses
Frequently asked questions
The plates exploit the exact hues that red-green deficient eyes struggle to tell apart. The digit's dots and the background dots share the same range of brightness and dot size — only the hue differs. Typical vision has three well-separated cone types and sees the hue boundary clearly; if the red and green cone responses overlap too much, the boundary disappears and the plate looks like uniform noise.
Reading 85% or more of the red-green plates matches how typical colour vision performs — no deficiency is suggested. A mid-range score is ambiguous: a dim screen, night-mode filters or glare can hide plates from anyone, so retry at full brightness in good light. Missing most red-green plates is the pattern associated with red-green colour vision deficiency, and worth confirming with an eye-care professional.
It targets red-green deficiencies — deuteranomaly, deuteranopia, protanomaly and protanopia — which account for the vast majority of all colour vision deficiency. It does not test for the much rarer blue-yellow (tritan) deficiencies or complete colour blindness (achromatopsia), which need different plate designs.
Official Ishihara testing uses printed plates with precisely controlled inks, viewed under standardised daylight. Your screen's colour calibration, brightness, blue-light filters and room lighting all shift the hues this test can display, so borderline results here are less reliable in both directions. Treat this as a screening for awareness; an optometrist can run diagnostic tests that also grade the type and severity.
Each plate is generated live on your device: thousands of dots are placed at random positions and sizes, coloured with random variation around the target hues, and the seven scored plates are drawn from a shuffled deck. Retaking the test therefore genuinely re-tests your colour vision instead of your memory.
Color Blindness Test is 100% free — no signup, no watermarks and no usage limits. It’s one of 200+ free tools we build and give away.
No. All sensor data is processed live on your device and never leaves it or gets stored.
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