About Seebility
Seebility is a free accessibility tool for seeing color the way other people see it. Around one in twelve men and one in two hundred women has some form of color vision deficiency, yet most of the web is designed as if everyone perceives color identically: red and green status dots, color-only charts, buttons that only differ by hue. Seebility lets anyone check that, on a real photo, a product screenshot, a live camera view, or a whole web page.
Upload an image or point your camera and you can view it simulated through protanopia, deuteranopia, tritanopia, their milder anomalous forms, and complete color blindness, at any strength, and even stack several deficiencies at once. Non-color conditions such as glaucoma, astigmatism, and severe vision impairment are simulated too. In the other direction, the correction mode pushes apart the colors a deficient viewer confuses, so a chart or a label becomes readable again. A short arrangement test modeled on the clinical Farnsworth D-15 builds your own profile, and one tap freezes the camera so you can identify any color by name and hex code. Every image is processed on your own device; nothing is uploaded.
It is built for two audiences. The first is people with color vision deficiency who want to know whether a form, a map, or a dashboard is actually usable for them, or who need to explain what they see to someone else with a shareable link. The second is the people who make those things: designers, developers, accessibility specialists, teachers, and product teams who need to test their work against something more concrete than a guideline. A public API and a Figma plugin bring the same simulation into a design file or a CI pipeline.
Seebility is built and maintained by a small independent team focused on practical accessibility tools. It is a self-check, not a medical device: the simulation math follows the published color vision deficiency research of Machado, Oliveira and Fernandes (2009) and the D-15 arrangement method, but only a qualified optometrist or ophthalmologist can diagnose a deficiency. The interface is designed to the same standard it preaches, with labels, names, and icons carrying meaning instead of color alone.
If Seebility helps you, or gets something wrong, we would like to hear about it.