How to use
- Upload an image by clicking the upload button.
- Select the colour vision deficiency type: Protanopia (red-blind), Deuteranopia (green-blind), or Tritanopia (blue-blind).
- Compare the simulated output image with the original to identify hard-to-distinguish colour pairs.
- Download the simulated PNG to share with teammates or include in accessibility reports.
- All processing runs in your browser and nothing is sent anywhere.
Examples
- Uploading a chart that uses red and green bars, then selecting Deuteranopia, shows both bars at nearly identical brightness — a strong signal to add patterns or labels.
- A UI screenshot run through Tritanopia simulation reveals that blue buttons and grey disabled states become visually indistinct.