Making the web
visible to everyone.
Deficiency View is a free, scientifically grounded accessibility platform that helps designers and developers understand how their work looks to the 300M+ people with color vision deficiency before it ships.
Our Mission
We believe digital accessibility shouldn't require expensive tools, enterprise contracts, or specialized expertise. Deficiency View exists to give every designer and developer - regardless of budget the tools to build inclusively.
Powered by the Machado et al. (2009) color transformation matrices the same methodology used in Adobe Photoshop.
Runs entirely in the browser. No installs, no accounts, no paywalls. Accessibility tooling should itself be accessible.
Aligns with WCAG 2.2 criteria 1.4.1 (Use of Color) and 1.4.3 (Contrast) giving designers a clear, actionable target.
Every feature starts with: "Does this help someone with CVD experience digital content better?" Full stop.
The Four Types We Simulate
Each type uses distinct color transformation matrices based on clinical research by Machado et al. (2009).
Reds appear dark or black. Red-green distinctions are lost. Affects ~1% of men.
Greens and reds blend into yellows. The most common CVD type, affecting ~6% of men.
Blues appear greenish, yellows shift pink. Affects men and women equally.
Full absence of color perception everything in grayscale. Rare but critical to design for.
No account required
Start testing your designs now.
Free. No account required. See your work through the eyes of people with color vision deficiency.