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Detect Color Blindness

Free color vision screening

Free Color Blind Test

Read the number hidden in each plate. In about a minute you'll get an instant estimate of your colour-vision type and its strength.

100% free No sign-up Instant result Private, on your device
Plate 1 of 14

What number do you see?

No timer · answers stay on your device

Tip: view in good lighting at 100% screen brightness for the most reliable result.

Not a medical diagnosis. This is an educational screening tool, not a clinical exam. Screen brightness, colour settings and lighting all affect the result. For anything that matters, a driving or aviation medical, a job requirement, or a health concern, book a professional colour-vision test with an optometrist or ophthalmologist.

How it works

Three quick steps

  1. 1

    Look at each plate

    A number is hidden in a field of coloured dots. Typical and colour-deficient vision see them differently.

  2. 2

    Tap what you see

    Pick the number, or "I can't see a number." No timer, take your time in good lighting.

  3. 3

    Get your result

    We estimate the type and strength instantly, with links to learn more.

Coverage

What this test screens for

Most common

Red-green deficiency

Protan & deutan types, about 1 in 12 men. Reds and greens are hard to tell apart.

Take the red-green test → Rarer

Blue-yellow deficiency

Tritan type, affects men and women about equally. Blues/greens and yellows/pinks blur.

Take the blue-yellow test → Reference

All the types

Control plates also flag rare total colour blindness, or simply a display problem.

See every type →

Is it accurate?

How reliable is an online colour blind test?

This screening uses original, Ishihara-style pseudoisochromatic plates: figures are built from dots whose colours sit on the red-green or blue-yellow confusion axis, at matched brightness, so the number only stands out by hue. That's the same principle behind the paper plates optometrists use, a genuinely useful first check.

It is not a clinical diagnosis. Every screen and room is different, and monitors can't be trusted for absolute colour. Use it to decide whether to get a professional exam, especially if colour vision matters for your studies, licence or job.

By The Detect Color Blindness editorial team Last reviewed

Frequently asked questions

Is this color blind test accurate?
It is a reliable screening tool that uses Ishihara-style plates to flag red-green and blue-yellow deficiencies, but it is not a clinical diagnosis. Screen quality, brightness and lighting all affect online colour tests. If the result matters for work, driving or health, confirm it with an eye-care professional.
How long does the test take?
About one to two minutes. You'll see a short series of coloured plates and tap the number you can read on each one.
Is it really free and private?
Yes. There's no sign-up and no payment. The test runs entirely in your browser, your answers are scored on your device and never uploaded.
What types of color blindness does it screen for?
Red-green deficiency (protan and deutan types, the most common) and blue-yellow deficiency (tritan). Control plates also help flag total colour blindness or a display problem.
Can I test my child?
Yes, use the kids' version, which replaces numbers with simple shapes and larger plates so pre-readers can take part. It's a screen, not a diagnosis; see a paediatric optometrist if you have concerns.
Why do I need good lighting and full brightness?
The plates rely on subtle colour differences. Low brightness, night-mode colour shifts and dim rooms can wash those differences out and cause false results, so view at 100% brightness in daylight-like lighting.

Keep exploring

What next?

Take the color blind test 14 quick plates · instant type & severity · no sign-up. Start the test → See how you see colour Simulate protan, deutan, tritan & more on any image. Open the simulator → Do colour blind glasses work? Honest comparison of EnChroma, Pilestone & ColorLite. Read the guide →