Preview how your colors or images appear to people with different types of color vision deficiency.
The most common are protanopia (no red cones, ~1% of males), deuteranopia (no green cones, ~1% of males), and tritanopia (no blue cones, very rare). Achromatopsia is total color blindness.
Don't rely on color alone to convey information. Use patterns, labels, and sufficient contrast. Test with a simulator like this one.
No. All processing happens in your browser. Images are never uploaded.