Color Blindness Simulator - Online Tool | ToolVault

1. How to use

1. Upload an image (UI screenshot, chart, infographic) or enter color codes.
2. Pick a simulation type: protanopia / deuteranopia / tritanopia / achromatopsia and preview the result.
3. Compare original and simulated side by side — is the information still distinguishable?

2. Practical accessibility tips

• Red-green deficiency is the most common (about 8% of men) — never rely on color alone for status (green=success, red=failure); add icons or text.
• Always check data visualizations: multi-line charts distinguished only by color may overlap entirely for color-deficient viewers.
• WCAG contrast ratios (4.5:1) are the baseline, but two high-contrast colors can still confuse under deficiency — the simulator catches this.
• Simulate during brand-color design phase — an order of magnitude cheaper than fixing visuals after launch.

3. Limitations and correct usage

The simulator is an approximate model, not real deficiency experience — actual color vision is a continuum, and simplified models (e.g. assuming full L-cone absence in protanopia) are representative approximations. Use it as a design aid, not an acceptance gate: it surfaces "color-only information" designs, but final validation needs real-user testing or established accessibility standards. One more application: simulation also helps non-UI contexts — chart palettes, choropleth map color scales, game UI rarity colors.