About ColorBlindTests.net
Hi, I'm Katherine, and this is the story of why ColorBlindTests.net exists.
I live in the San Francisco Bay Area and work as a software engineer. For as long as I can remember I've had a quiet suspicion that something is a little off with how I see certain colors — the kind of mild confusion you brush off until a friend points out that your “green” sweater is actually brown. I never knew if I was actually color deficient or just bad at naming colors.
When I finally went looking for a way to check, every site I landed on was either buried in ads, locked behind an email signup, charged money for a basic screening, or felt sketchy enough that I closed the tab. I wanted something simple: a clean page, a real test, and an honest result.
So in early 2026, I started building this site. It began as a personal tool and grew into ColorBlindTests.net — a free collection of the most commonly used color vision screening tests (Ishihara, Farnsworth-Munsell D-15, Cambridge, and a few others), implemented digitally and explained in plain English. No paywalls, no email gates, no dark patterns.
A Few Honest Things
I am not an eye doctor. I have no medical training and no special expertise in ophthalmology or color vision science. I'm a curious software engineer who spent a lot of time reading public material from the National Eye Institute (NEI), the American Academy of Ophthalmology (AAO), the NHS, and peer-reviewed sources, and tried to translate what I learned into tests and explanations that an ordinary person can use.
This site is a screening tool, not a diagnosis. Online color vision tests, including the ones here, can never fully replace a proper exam by a licensed optometrist or ophthalmologist. Screen calibration, ambient lighting, and display technology all affect color rendering. If a result here surprises or worries you, please see a real eye care professional.
Every test page cites its sources. Where I describe how a test works, what the results mean, or any prevalence/genetics facts, I link to the original medical or scientific source rather than asking you to take my word for it.
What You'll Find Here
The site currently includes the Ishihara plates test, a Farnsworth-Munsell 100 Hue arrangement test, a D-15 test, a Cambridge-style test, a lantern test, a kids' version, a color blindness simulator, and a small blog where I write about specific questions I get asked — like color blindness in the military, driving with color vision deficiency, jobs to consider, and signs to look for in a child.
Get in Touch
I personally read every email. If you spot an error, have a suggestion, want to share your own story with color blindness, or just want to say hi, please reach me at support@colorblindtests.net. I try to respond within 48 hours.
— Katherine, ColorBlindTests.net