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Free Color Blind Test: Colorblind Check in 2 Minutes

Take this free online color blind check with 12 dot plates. You get an instant result in plain words. No sign-up, no email, nothing saved.

Short answer: Color blindness is reduced ability to tell certain colors apart, most often red from green. The National Eye Institute says about 1 in 12 men are affected. This free test shows 12 dot plates and gives a plain-words result in about two minutes. It can show signs, but only an eye doctor can diagnose color blindness.

This is a screening tool, not a medical diagnosis. Results depend on your screen, brightness and lighting. See an eye doctor for a proper exam. Medical disclaimer

Color blind test

Last updated: . Based on the sources listed below.

How does this color blind test work?

You see 12 round plates made of colored dots. On each plate, dots of one color family form a two-digit number against dots of another family. Type the number you see, or choose “I see nothing”. People with normal color vision read nearly all of them. People with a color vision deficiency may not see the number on some plates.

  • 2 check plates. Almost everyone can read these. They show that your screen and eyes are working for this test.
  • 6 red-green plates. The most common kind of color vision deficiency makes it hard to tell red and green apart (National Eye Institute: Color Blindness).
  • 2 blue-yellow plates. A rarer type affects blue and yellow (NEI: Types of Color Vision Deficiency).
  • 2 plates that hint at the red-green type. They are built so that a protan-type and a deutan-type viewer are likely to read them differently. A screen cannot tell the types apart reliably, so treat the hint as a hint.

Every plate is drawn by our own code, with new random numbers and dot patterns each time you start, so answers cannot be memorized. We did not copy any published test plates. Dot colors were chosen with a standard computer model of color blind vision (Machado et al., 2009) so that the number cannot be read from brightness alone.

What do the results mean?

Possible results
ResultWhat it meansWhat to do
Typical for normal color visionYou read the plates as most people do.Nothing, unless you notice color problems in daily life.
Possible mild signsYou missed a few red-green plates.Retest with full brightness and no night mode, then see an optometrist if it repeats.
Signs of red-green deficiencyYou missed several red-green plates.Ask an eye doctor for a proper color vision test.
Signs of blue-yellow difficultyYou missed both blue-yellow plates.See an eye doctor; this type can also come from eye conditions.
No clear resultYou missed a check plate.Fix screen settings and retest.

This is how our test groups answers. It is not a clinical scale.

Is a free online color blind test accurate?

Partly. The NHS says tests are available online but it is important to get checked at an optician if you have concerns, and that color vision testing is not part of the routine NHS eye test, so you have to ask for it. Screens differ in brightness and color, and your room light and any night mode change what you see. Our test is a screening tool: it can point out signs, and it can miss mild ones. It is not a diagnosis.

What is color blindness?

Color blindness, or color vision deficiency, means you see colors differently from most people. Usually it runs in families, and most people with it have no problem with everyday activities. Symptoms are often so mild that many people do not know they have it (National Eye Institute: Color Blindness). Read about the types of color blindness, or try the shorter red-green color blind test.

Get the best result

  1. Set the screen to full brightness and switch off night mode and blue-light filters.
  2. Use your normal glasses or contact lenses, but no tinted glasses.
  3. Sit in normal room light, and avoid glare on the screen.
  4. Answer from your first impression. Do not tilt the screen or zoom the page.

Frequently asked questions

Is an online color blind test accurate?

Not fully. An online test can show signs, but screens differ in brightness and color, so results vary. The NHS says tests are available online but it is important to get checked at an optician if you have concerns. Only an eye care professional can diagnose color blindness.

What is color blindness?

Color blindness, also called color vision deficiency, means you see colors differently from most people and may find it hard to tell some colors apart. It usually runs in families, and most people with it manage everyday activities. According to the National Eye Institute, there is no cure for the inherited kind.

How common is color blindness?

The National Eye Institute says about 1 in 12 men have color vision deficiency. MedlinePlus Genetics reports red-green types in about 1 in 12 males and 1 in 200 females among people of Northern European ancestry, with lower rates in almost all other populations studied.

What is the most common type of color blindness?

Red-green color vision deficiency is the most common kind. The National Eye Institute names deuteranomaly as the most common red-green type. It makes certain shades of green look more red, is usually mild, and does not usually get in the way of normal activities.

Can you become color blind later in life?

Yes. Most people are born with it, but color vision deficiency can also come from eye diseases such as glaucoma, brain and nervous system diseases, some medicines, or injuries. Color vision may also get worse with age, especially with cataracts. See an eye doctor if your color vision changes.

Should I see an eye doctor if I fail an online test?

Yes, if you have concerns. The NHS says to go to an optician if you or your child have signs of color vision deficiency, and notes that color vision testing is not part of the routine NHS eye test, so you need to ask for it. A screen test is not a diagnosis.

Sources

  1. National Eye Institute (NIH). Color Blindness. Last updated November 5, 2025. https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness
  2. National Eye Institute (NIH). Types of Color Vision Deficiency. Last updated August 7, 2023. https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness/types-color-vision-deficiency
  3. NHS. Colour vision deficiency (colour blindness). Page last reviewed March 17, 2023. https://www.nhs.uk/conditions/colour-vision-deficiency/
  4. Machado GM, Oliveira MM, Fernandes LAF. A Physiologically-Based Model for Simulation of Color Vision Deficiency. IEEE Trans Vis Comput Graph. 2009;15(6):1291-1298. https://doi.org/10.1109/TVCG.2009.113
  5. MedlinePlus Genetics (U.S. National Library of Medicine). Color vision deficiency. https://medlineplus.gov/genetics/condition/color-vision-deficiency/
  6. National Eye Institute (NIH). Causes of Color Vision Deficiency. Last updated January 30, 2025. https://www.nei.nih.gov/learn-about-eye-health/eye-conditions-and-diseases/color-blindness/causes-color-vision-deficiency
  7. American Academy of Ophthalmology. What Is Color Blindness? Published July 2, 2026; reviewed by Cesar A Briceno, MD. https://www.aao.org/eye-health/diseases/what-is-color-blindness

All sources were read on October 11, 2026. We only state what the sources say, and we do not invent numbers. These pages have not been reviewed by an eye care professional. Spot a mistake? Email info@colorblindcheck.app.

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