Free · on-device · open-source · published method

SEE COLOR.
CHECK COLOR.
CORRECT COLOR.

OpticQuiz is two things built on one published color-vision method: free online vision tests, and a color-accessibility platform that checks a palette, fixes it, and corrects color in real time for people who can't tell it apart.

Explore the color tools Take a vision test
ONE PUBLISHED
METHOD

Everything above runs on the same open-access method — DOI 10.5281/zenodo.21310578, Machado (2009) color-vision simulation with CIEDE2000. It's a screening and correction aid, not a legal audit, and it says so. Published so you can check it. See the research →

WHY IT'S HONEST

One person, real tests, and a strict rule: every tool states exactly what a screen can and cannot measure. No fake precision, no diagnosis cosplay, and your answers and scores never leave your device. The honesty policy → · See every use case →

Keeping no analytics on you has a cost: it means this site cannot prove it helps anyone. So it asks instead. The Impact Archive is a consented, citable record of who these tools actually helped — published in full, including the people who said they didn't, and deletable by its authors at any time.

Important — read before using. OpticQuiz is an educational and accessibility tool, not a medical device or diagnostic instrument. The vision tests are screening estimates for personal, educational use and do not diagnose any condition; screen-based results are limited by display calibration, lighting, and viewing distance. The color-correction tools are aids that improve color distinguishability, not a cure, and are not a legal ADA/WCAG accessibility audit. If you're concerned about your vision or eye health, see a licensed optometrist or ophthalmologist.

PRODUCT EXAMPLES

DEUTAN
Palette checker

FIND THE CONFLICT

Paste a palette and see which pairs collapse into each other — with the CIEDE2000 difference before and after.
Browser extension

CORRECT ANY PAGE

Recolor the web as you browse, so color-coded charts and status dots stop being guesswork.
<script src="eye.js"> CVD ON
One-line widget

A COLORBLIND MODE

One script tag adds a color-vision mode to your own site. No build step, no account.
VIRIDIS ✓ JET ✗
Palette benchmark

SCORED COLORMAPS

viridis, jet, Tableau and more, measured on the same method — so you can pick one on evidence.
Phone camera

THE REAL WORLD

Point your camera at wiring, produce or a pill bottle and see the colors pulled apart live.
$ pip install cvdsafe >>> is_safe(palette) False 30 packages · PyPI + npm + MCP
Packages & API

IN YOUR PIPELINE

The same published method as a package, an API and an MCP server — so your build can fail on a bad palette.