#E4002B
Approximate name: Crimson
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
Crimson
Relative luminance
0.167
Hue H
349°
Saturation S
100%
Lightness L
45%
Value V
89%
Temperature
Warm
Brightness
Dark
Chroma
Vivid
Hue family
Red
Contrast on white: 4.85:1 (AA body Pass / AAA Fail)
Contrast on black: 4.33:1 (AA body Fail / AAA Fail)
Open full contrast tool →Color blindness simulator
Approximate appearance under common color-vision deficiencies (matrix simulation).
Normal vision
#e4002b
Protanopia
#817f21
Deuteranopia
#8fa01e
Tritanopia
#d91817
Achromatopsia
#494949
Creative pairings
Hue-wheel harmonies and 10% shade/tint steps — not AI-generated copy.