Which deficiency modes are modelled?

Protanopia (L-cone), deuteranopia (M-cone), tritanopia (S-cone), and sometimes full achromatopsia — each shifts or removes channels differently.

Is simulation the same as lived experience?

No — it approximates photoreceptor response for empathy and QA. Always include user research and assistive-tech testing.

Why pair this with contrast checking?

Some pairs pass luminance ratios yet fail when hue is the only differentiator under colour-vision deficiency.

What design fixes help most?

Add text labels, patterns, icons, thickness variation, or position — never rely on red/green alone for status.

Can daltonisation fix screenshots?

Real-time daltonisation filters exist but can distort brand colours; prefer semantic redesign over automatic shifts for product UI.

Does upload leave my machine?

Simulation runs client-side if you load local images — nothing is sent for analysis.

Should videos be tested?

Yes — pause frames with colour-only cues and run them through the same modes.

WCAG references colour perception obliquely; industry-specific rules (transport, medical) may be stricter — treat simulation as one input, not certification.

Color Blindness Simulator

Color Live

Preview your design for protanopia, deuteranopia and tritanopia.

About this tool

Color Blindness Simulator — Preview your design for protanopia, deuteranopia and tritanopia. Free, fast and private. Runs entirely in your browser at Quick Ca

Examples

Common scenarios for the Color Blindness Simulator.

Status badges

mode: deuteranopia

Red vs green alerts may become hard to separate.

Line chart series

mode: protanopia

Hue-only legends collapse — dash patterns needed.

Who uses the Color Blindness Simulator?

Common scenarios and audiences for this tool.

Design QA

Gate releases where traffic-light semantics ship without text.

Data teams

Validate multi-series dashboards before executives view Monday metrics.

Game UX

Ensure collectibles remain visible for colour-deficient players.

Transit app teams

Check route lines that currently differ only by hue.

Educators

Teach inclusive palette habits with tangible previews.

Frequently asked questions

Everything you need to know about the Color Blindness Simulator.