The platform
CHECK & CORRECT COLOR
One published method (Machado 2009 + CIEDE2000), wherever color carries meaning.
If you're colorblind
If you design or build
The tests
TEST YOUR VISION
16 free, honest online vision tests. No account, computed on your device, and every one says what a screen can and can't measure.
Read the plain-English guides →
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.
