#E91616
Approximate name: Red
Technical formats
Color-space values for scientific work and cross-device comparison.
Practical formats
Ready to paste into CSS, Tailwind, iOS, Android, Flutter, and more.
Color analysis
Objective metrics: luminance, hue, saturation, temperature, and contrast.
Nearest name
Red
Relative luminance
0.18
Hue H
0°
Saturation S
83%
Lightness L
50%
Value V
91%
Temperature
Warm
Brightness
Dark
Chroma
Vivid
Hue family
Red
Contrast on white: 4.57:1 (AA body Pass / AAA Fail)
Contrast on black: 4.59:1 (AA body Pass / AAA Fail)
Open full contrast tool →Color blindness simulator
Approximate appearance under common color-vision deficiencies (matrix simulation).
Normal vision
#e91616
Protanopia
#8e8c16
Deuteranopia
#9aaa16
Tritanopia
#de1616
Achromatopsia
#555555
Creative pairings
Hue-wheel harmonies and 10% shade/tint steps — not AI-generated copy.