Color Vision Plates

I'm colorblind. Every "color blind test" app I tried was either a marketing funnel, an ad farm, or scientifically wrong. So I built the one I wanted: the method written down, sources cited, nothing to sign up for. Color Vision Plates is a 14-plate screening for red-green and blue-yellow color vision differences. It tells you which groups of plates you missed. It does not name a type or a severity, because a phone screening can't establish either. HOW IT WORKS • Number plates and shape plates inspired by the Ishihara (1917) and HRR (1954) tests. These are original generated plates, not scans of the clinical sets • Plates are grouped into red-green, experimental protan-design and deutan-design, blue-yellow, and control sets • Plate colors are specified in CIELAB and checked with color-vision simulations (Brettel, Viénot & Mollon 1997) and the CIEDE2000 color difference. Those checks describe the math, not what any one person will see • A gray-patch check before the test starts, because a dimmed or Night-Shifted screen changes what you see. It does not calibrate your screen's colors • A brightness-contrast control plate. Miss it and the result is marked inconclusive instead of guessing • Plate order shuffles and dot patterns reroll on every retake WHAT YOU GET • A plain result that describes your answers, such as "Several red-green plates missed" or "Most or all plates matched" • What can affect your answers: display, brightness, color filters, lighting • A plate-by-plate review of every answer • Screening history saved on your device, so you can retest over time and compare • The method, its limits and full citations, one tap away THE HONEST PART This is an experimental screening, not a medical diagnosis. Its sensitivity, specificity and subtype accuracy have not been established. Phone screens vary; clinical tests use calibrated printed plates under standardized lighting. Matching every plate does not rule out a color vision difference. The app says this before the test, on your results and in your history, because a screening tool that oversells itself is worse than none. If your results suggest a color vision difference, see an eye care professional. PRIVACY No accounts. No tracking. No analytics. No ads. No network calls. The entire test is bundled with the app and runs offline. Your results stay on your device, and you can erase them anytime. OPEN SOURCE The app and its plate generator are MIT licensed. You can read exactly how every plate is made. REFERENCES Ishihara (1917); Hardy, Rand & Rittler (1954); Brettel, Viénot & Mollon (1997); Viénot, Brettel & Mollon (1999); Sharma, Wu & Dalal (2005) for CIEDE2000 color difference; Birch (2012) on prevalence. From the maker of What Color Is This?, the camera color-identifier built for colorblind people. About 1 in 12 men and 1 in 200 women have a color vision difference. Most found out by accident. Made by Luke Steuber. Published by Bridge City Lab LLC.