Check your colour vision with 12 Ishihara-style dot plates and get a plain-language result in about two minutes. The plates are drawn in your browser and your answers stay on your device.
Color Blind Test Online
Check your colour vision with 12 Ishihara-style dot plates and get a plain-language result in about two minutes. The plates are drawn in your browser and your answers stay on your device.
The plates are generated on your device from a random seed and your answers are scored in your browser. Nothing you type or see is uploaded, and the test keeps nothing once you close the page.
The Color Blind Test shows twelve round plates of coloured dots, one at a time, and asks you to type the number you see or say that you cannot see one. Plate 1 is a demonstration that a red-green deficiency does not hide, so it confirms your screen is set up properly. Seven transformation plates make the number vanish for a red-green deficient viewer, or leave only one of its digits; three hidden-number plates are fainter, and a control plate closes the test. Dot sizes are random and every dot is a little lighter or darker, so only hue carries the number. Ten or more plates read like most people do means no sign of a red-green deficiency; six or fewer, with the typical pattern, means a possible one, graded mild, moderate or strong; anything between is inconclusive.
Features
Twelve plates in a fixed order: a demonstration plate, seven transformation plates, three hidden-number plates and a control plate
About 1,500 non-overlapping dots per plate, drawn in your browser from a random seed, so a retake brings new dots and a different set of numbers
Transformation plates on which the number vanishes for red-green deficiency, or only one of its digits stays visible
Blue and yellow demonstration and control plates that people with a red-green deficiency can still read, so a miss points to your setup
A numeric answer box that submits on Enter, an "I can't see a number" button, and no Back button, so plates cannot be compared
Three outcomes with a plain explanation: no sign, possible red-green deficiency (mild, moderate or strong), or inconclusive
An answer table beside what most people see and what red-green deficient viewers typically report on each plate
A one-click copy of the result line and a link to the Color Blindness Simulator
How to use the Color Blind Test
Switch off night mode, True Tone, blue-light and colour filters, set the brightness to about medium and put on your usual glasses
Press Start the test and type every digit you see on each plate, then press Enter; choose I can't see a number when none stands out
Answer from your first impression, because you cannot go back to an earlier plate
Read the result and the answer table, then retake with new plates, or see an optometrist if the result is possible or inconclusive
11 of 12 plates read as most people do → no sign of red-green colour vision deficiency
Test plates: 9 read like most people, 1 answered "nothing" · screening only, not a diagnosis
Plate 4 was a transformation plate, and one missed plate is within the two slips a typical result allows.
Common errors & troubleshooting
The first plate looks blank, or I cannot read it. — A red-green deficiency does not hide that plate, so the test cannot be interpreted without it. Turn off night mode and colour filters, set the brightness to about medium, wear your usual glasses and try again; if it stays unreadable, see an optometrist.
My result changed when I retook the test. — Every run uses new dots and a different set of numbers, and screen settings, room light and tiredness all shift colours a little. A result that flips between runs usually points to the setup, so retake with filters off in even light before drawing conclusions.
I answered every plate but the result says inconclusive. — That means your answers did not fit either typical pattern: the first plate was missed, 7 to 9 plates matched most people, or several answers were numbers a red-green deficient viewer rarely reports. Check that you typed what you saw, then retake.
The dots look washed out or tinted. — A night mode, a colour profile, a tinted screen protector or an accessibility colour filter changes every dot. Switch them off, return the display to its default profile and avoid coloured light falling on the screen.
Frequently asked questions
How accurate is the Color Blind Test compared with a test at the optometrist?
It is a screening, not a diagnosis. Screens differ in colour accuracy, brightness and filters, and the room light is not controlled, so a mild deficiency can pass and a normal viewer on a tinted screen can slip. An eye-care professional uses printed plates under standard light and tests such as an anomaloscope or hue-arrangement test, which also give the type and severity.
What do the Ishihara-style plates in the Color Blind Test actually measure?
Whether you can pick a number out of a field of dots by hue alone. Dot sizes are random and each dot is lighter or darker than its neighbours, so brightness is no clue; what separates the number from the background is a difference between reds and greens that a red-green deficient viewer largely cannot use. The plates are generated here and are not the original Ishihara plates.
What does red-green colour blindness look like in everyday life?
Reds, greens, browns and oranges can look alike, as can purple and blue or pink and grey. Ripe fruit among leaves, the doneness of meat, colour-coded charts and maps, and a lit traffic light without its position are typical trouble spots. Many people only find out when tested, because the world has always looked that way to them, and the effect ranges from slight to strong.
Can colour blindness be cured or corrected after taking the Color Blind Test?
Inherited red-green deficiency has no cure. Some tinted glasses and lenses raise colour contrast for some people with a mild or moderate deficiency, but they do not give normal colour vision and results vary. Colour changes caused by disease, a medicine or a clouded lens can improve when the cause is treated, and gene therapy is still experimental. Colour labels and friendly palettes help in the meantime.
Can the Color Blind Test tell protan, deutan and tritan deficiency apart?
No. Protan problems involve the red-sensitive cones, deutan problems the green-sensitive ones and tritan problems the blue-sensitive ones, and each can be an anomaly (shifted, milder) or an anopia (missing, stronger). Protan and deutan are the red-green kinds, deutan the most common, and tritan is very rare. This test screens for the red-green kinds only and does not separate protan from deutan.
What should I do after the Color Blind Test says a red-green deficiency is possible?
Retake it with every filter off, the brightness about medium and even light, because setup can cause the same pattern. If the result stays possible, ask an optometrist or eye doctor for a colour vision exam, and mention it to a child's school or to an employer when colour matters for the work. A possible result is a reason to get tested, not a conclusion.
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