Preparing tool
How to use Colour Blindness Simulator
- Upload or paste (Ctrl+V) a screenshot, chart or design, or try the sample chart.
- Pick a vision profile on the left (keys 1–8) and drag the split line to compare with typical vision, or view all profiles side by side.
- Read the findings on the right: each flagged colour pair shows how it looks to the affected people, and tapping it highlights where those colours are in the image. Check a palette by its hex codes, and export a PNG report or the findings as CSV.
What are the limits of Colour Blindness Simulator?
Uses the widely used Machado (2009) model of colour vision deficiency; real colour perception varies from person to person and with screens and lighting. It shows how colours may look, not a medical test. The image stays on your device.