How does this colour vision test work?

It shows 15 plates, each a circle of random dots in which a two-digit number is hidden by colour. Type the number you see and press "Next plate", or press "I see nothing". Two plates are obvious to everyone and check your screen and your understanding, one plate is empty, and the rest use colours that are hard to tell apart with red-green or blue-yellow colour vision differences. The plates are generated in your browser from a seeded random generator, so none of them are copied from any book.

How do I read my result?

Of the 9 red-green plates, missing 0 or 1 shows no sign of a difference, 2 or 3 is a possible difference, and 4 or more fits a red-green pattern, which leans protan or deutan depending on which plates you missed. Of the 3 blue-yellow plates, missing 2 is a possible difference and missing all 3 fits a blue-yellow (tritan) pattern. If you miss an obvious plate, the test says the result is not reliable. Press "Review every plate" to see each answer.

Is this a medical test? How accurate is it?

No. It is a screening for information only, not a medical diagnosis. Screen calibration, brightness, night mode and colour filters, tinted glasses and room lighting all change how the plates look, and a mild difference can be missed. If you are worried about your colour vision, see an optician or doctor for a clinical test.

Will I get the same plates again?

Only if you use the same test code. Leave "Test code (optional)" empty and you get a new six-digit code and new plates each time. Type a code, or press "Retake the same plates" on the result, and the plates, numbers and order are identical.

Are my answers saved or uploaded?

Your answers are checked in your browser and never uploaded. Only a short note of your last result (its test code, the headline and the date) is kept in this browser so the start page can show it, and nothing goes in the page address. Clear your browser data to remove it.

Yes. Every tool is free to use, with no account and no credit card. The work runs on your device rather than on our servers, which is what keeps it free to run.

Does it work on mobile?

Yes. It runs in current mobile browsers on iOS and Android, with nothing to install.

👁️

Free Color Vision Test

Take a 15-plate colour vision screening with dot patterns made on the spot, type the number you see, and get a careful summary of red-green or blue-yellow tendencies. Not a diagnosis.

Runs in your browserNo sign-up, no pop-upsNo login requiredFree forever15 plates made on the spotRed-green and blue-yellow checkNot a medical diagnosis

This is not a medical diagnosis. Screen calibration, brightness, colour filters and room lighting all change how the plates look, so results can differ from a clinical test. If you are worried about your colour vision, see an optician or doctor.

A 15-plate colour vision screening

Each plate is a circle of coloured dots with a two-digit number hidden in it, or nothing at all. Type the number you see, or press "I see nothing". Do not stop to study a plate: go with your first impression. The plates are generated in your browser, so they are new every time.

Turn off night mode, blue-light filters, dark-mode extensions and any colour filter, and do not zoom the page.
Set the screen to a medium or high brightness.
Use daylight or plain white room light, not coloured light.
Wear your usual glasses or lenses. Tinted lenses change the result.
Test with both eyes first. You can cover one eye and repeat to compare.

Test code (optional)

The same code always gives the same plates. Your result shows its code.

🔒 The plates are made and checked in your browser. Your answers are never uploaded, and only your last result is kept in this browser. Nothing goes in the page address.

How It Works

The page packs random dots into a circle, writes a number into them by colouring the dots along the number's strokes, and picks the two colours by searching for pairs that a simulated colour vision difference cannot tell apart while typical vision can. Everything runs on your device.

1
Set up your screen
Turn off night mode and colour filters, use medium or high brightness and daylight, then press "Start the test".
2
Read each plate
Type the two-digit number you see and press "Next plate", or press "I see nothing". There are 15 plates, including obvious ones and an empty one.
3
Get a careful summary
The result counts misses on the red-green and blue-yellow plates and says whether the pattern leans protan, deutan or neither. It is never a diagnosis.
4
Review or repeat
Press "Review every plate" to see the answers, or "Retake the same plates" to repeat the same test code.

Your answers stay in this browser. Only your last result is saved here, nothing goes in the page address, and nothing is uploaded.

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