Lens Kit

The kit is a small floating toolbar. Five lenses simulate how this page reads with protanopia, deuteranopia, tritanopia, achromatopsia, and low vision. One button scans every visible text element for WCAG contrast and badges what fails.

No install, no store, no account, no hosting. The button below is a link that carries the entire engine inside itself. Once it sits in your bookmarks bar, one click opens the kit on whatever page you are looking at, your staging build, a client site, anything.

Honest limits. Backgrounds that are images or gradients are listed for manual review, never guessed. Sites with a strict content security policy can block injected scripts, which is exactly why a browser extension build of the same engine is the natural phase two. The toolbar itself keeps 44px targets, visible focus, and reduced-motion fallbacks. It has to pass its own scan.

The vision lenses subtract what normal vision has. That direction serves designers. The My vision section in the toolbar runs the same matrices in reverse: pick your own vision type, and the assist lens redistributes the color signal you miss into the channels you keep, so pairs that looked identical pull apart.

One honest limit stays. A protanope cannot be shown true red, no screen can add a cone. But red and green can stop lying. And the simulation lenses gain a second life in this direction: switch on your own vision type, take a screenshot, and show your team the world you actually work in.