HexaCalc
All tools
Pick Hex color pickerColor picker from imagePalette from imageCamera color identifierScreen color picker
Create Palette generatorColor wheelComplementary colorsTriadic colorsMonochromatic schemeColor mixerBrownBlueGreenPurplePinkOrangeGrayColor matcherGradient generatorTailwind color generatorShades and tintsRandom color generatorPaint color visualizerWebsite color schemesColor mixing chart
Check Contrast checkerColor blindness simulatorColor blind testTypes of color blindnessHue test
Convert HEX to RGBRGB to HEXRGB to CMYKCMYK to RGBHEX to CMYKHEX to HSLColor converterColor temperatureColor name finder
Personal color Color analysisSkin tone chartSeasonal color quizWinterAutumnSpringLight SpringTrue SpringBright SpringLight SummerTrue SummerSoft SummerSoft AutumnTrue AutumnDeep AutumnDeep WinterTrue WinterBright Winter
Color families Color codesBlueGreenSage greenMauveRedPinkPurplePastelNeutralDarkGoldGrayMint greenLight greenLight purpleLime greenPastel pinkNeonPastel greenPastel yellowPeachCrimsonCool colorsBurnt orangeOrangeGreigeBright colorsSpring colors
Hex math Hex calculatorHex to decimalDecimal to hexHex to binaryBinary to hexHex to textText to hex
More tools Minecraft color codesColor gameResistor color codeImage color changerColor by numberGrayscale image
↑ ↓ to moveEnter to openEsc to close

Color blind test

Read the number hidden in each dot plate, or say you cannot see one, and you get a screening result at the end. This is a screening exercise, not a medical diagnosis.

Screening only, not a diagnosis. Screens differ in color and brightness, and these plates are generated by HexaCalc, not the clinical Ishihara or HRR plates. If your result suggests a deficiency, or you are worried about your vision, see an optometrist or ophthalmologist.

  • Turn screen brightness up and switch off night mode, True Tone or blue-light filters.
  • Sit at a normal distance and give each plate about three seconds.
  • Wear your usual glasses, but not tinted or color-correcting lenses.

How the test works

You see eight dot plates, one at a time. Each hides a number made of dots that differ in color from the dots around them. Type the number you see, or press I don't see a number. At the end you get a summary, a table of your answers and a side-by-side view of each plate as people with different color vision see it.

The plates are of three kinds:

PlatesPurpose
1 controlReadable by almost everyone. Missing it points to a screen or setup problem.
5 red-greenColors that collapse for protan and deutan color vision.
2 blue-yellowColors that collapse for tritan color vision but stay clear for red-green types.

How the plates are generated

Unlike the printed Ishihara book, these plates are drawn fresh every time you start, so you cannot learn the answers. For each plate the tool:

  1. Picks a background color, then searches thousands of candidate figure colors.
  2. Keeps only pairs that differ clearly for typical vision (a CIEDE2000 difference of at least 18) while differing by less than about 4–6 when run through the Machado (2009) simulation of the targeted deficiency.
  3. Packs roughly a thousand dots of varied sizes into a disk and colors those inside the number with the figure color.
  4. Adds random lightness and saturation noise to every dot, so the number cannot be found from brightness alone.

That last step matters. Without it, a person with a red-green deficiency could often spot the figure because it is slightly lighter or darker.

Reading your result

  • No sign of a deficiency: you read the control and nearly all plates. One miss is common on screens.
  • Possible red-green deficiency: two or more red-green plates missed while the control was read. This is the most common pattern, found in about 1 in 12 men and 1 in 200 women.
  • Possible blue-yellow deficiency: both blue-yellow plates missed. Inherited tritan deficiency is rare, and blue-yellow changes can also come with eye conditions, so an eye exam is worthwhile.
  • Result unclear: the control was missed, or misses were spread across every type. That usually means screen brightness, a night-mode filter or viewing angle.

Why a screen test can only screen

Clinical plates are printed with controlled inks and viewed under a standard daylight lamp. A screen adds variables no website can control: the panel's color gamut, its calibration, brightness, filters such as Night Shift or True Tone, and room light. Your result points in a direction. Only an eye care professional can diagnose, using tests such as Ishihara or HRR plates, arrangement tests or an anomaloscope.

This test does not diagnose anything and is not medical advice.

Tips for a fair result

  1. Turn brightness up and disable night modes and blue-light filters.
  2. Look at the screen straight on. Laptop screens shift color when tilted.
  3. Give each plate about three seconds. Long staring does not help.
  4. Wear your usual glasses, but not tinted or "color-correcting" lenses, which shift colors and can make the test meaningless.

Living with a color vision deficiency

Most people with mild red-green deficiencies only find out by chance. A few practical aids help: phone camera apps such as the color identifier to name colors, labeling clothes, and asking for charts with patterns or labels. Some careers, such as aviation, rail or electrical work, have color vision standards, so a formal test is worth doing before applying.

The hue test checks how finely you can order closely related colors. The color blindness simulator shows how images and palettes look with each deficiency. The color game is a lighter way to practice judging colors.

FAQ

Can color blindness be cured or corrected?

Inherited color vision deficiency has no cure. Tinted glasses can increase the difference between some colors for some people, but they do not restore normal color vision and can make other colors harder to tell apart.

Can women be color blind?

Yes, though red-green types are much rarer in women, because the genes sit on the X chromosome and women usually have a second working copy.

Why do I get different results on my phone and laptop?

The screens show colors differently. Use the device with the brightest, most neutral screen, and treat any difference between devices as a reason to get a professional test.