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Color vision test

Test your color perception with dot-pattern plates along real confusion lines - freshly generated each run. Not a medical eye exam.

Procedurally generated dot-pattern plates, constructed along real confusion lines - freshly generated every time you take the test.

Not a medical eye exam: the result is not a diagnosis of a color vision deficiency and does not replace an eye-care examination.

Honest note: display calibration, brightness and ambient light noticeably affect color perception - test on a well-calibrated screen in normal lighting.

In 3 steps

  1. Read the notes and start the test.
  2. For each plate, tap the digit you recognize or choose "nothing recognizable".
  3. At the end, review your result, save the result image or try a new pattern.

Your local statistics

Best score
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Runs
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Streak
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Everything stays on your device: no account, no server, exportable and deletable at any time.

Is my file uploaded?

No. Everything runs in your browser - your file never leaves your device. How this is verifiable

No upload100% local
Your content stays with youno third-party access
Hosted in GermanyGlobal Content Delivery
Independently auditedTLS A+ · HTTP headers A+

The color vision test shows you several plates made of colored dots, one after another, each hiding a digit. The plates are not colored randomly - they are constructed along real confusion lines in color space, the exact axes along which certain color vision deficiencies (protanopia, deuteranopia) genuinely cannot tell two colors apart. Every plate is freshly generated each time you take the test.

The underlying math comes from published color-vision-deficiency simulation models (Machado, Oliveira & Fernandes, 2009) - the same models professional color-blindness simulators use. Naive random red-green patterns without this construction would produce systematically wrong results, because they do not actually model a real color vision deficiency.

Display calibration, brightness and ambient light noticeably affect color perception - for a meaningful result, test on a well-calibrated screen in normal lighting. The result is a rough indicator, not an eye-care diagnosis.

Specifications

Specifications
Input formatsNo file (generator)
Batch processingNo
ProcessingLocally in your browser (JavaScript)
File uploadNone

Limitations: The test is a rough self-assessment indicator, not an eye-care diagnosis of a color vision deficiency. Display calibration, brightness and ambient light affect the result; a reliable assessment requires an eye-care examination.

FAQ

Is this a medical eye exam?

No. The result is not a diagnosis of a color vision deficiency and does not replace an eye-care examination.

Why are the plates different every time?

The digit, color pair and pattern are freshly generated every run using real randomness (crypto.getRandomValues) - there are no fixed plates you could memorize.

What are confusion lines?

These are directions in color space along which certain color vision deficiencies cannot tell two colors apart - derived from published simulation matrices (Machado et al. 2009). This test’s plates are constructed exactly along those lines.

Why not real Ishihara plates?

The original Ishihara plates are copyrighted. This tool generates its own, procedurally generated plates following the same scientific principle.

Are my results uploaded?

No. Your result is only stored locally in your browser - with an export and a delete button.

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