#C4331B
Closest named color: Sinopia (#BB3E03). oklch(54.3% 0.185 32), rgb(196, 51, 27).
Aa
White text reads best on this color (5.47:1).
About this color
#C4331B is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.185 and its hue 32°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.027 away. White text reads best on it, at 5.47:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.185) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.83:1 |
| White text | 5.47:1 |
Values
| HEX | #C4331B |
| RGB | rgb(196, 51, 27) |
| HSL | hsl(9, 76%, 44%) |
| OKLCH | oklch(54.3% 0.185 32) |
Contrast
WCAG 2 contrast ratios are the conformance target: AA needs 4.5:1 for body text and 3:1 for large text, AAA needs 7:1. APCA Lc values are supplementary guidance from the WCAG 3 drafts.
| Pair | WCAG 2 | Result | APCA | APCA guidance |
|---|---|---|---|---|
| White text on #C4331B | 5.47:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #C4331B | 3.83:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #C4331B text on white | 5.47:1 | AA | Lc 75.9 | Fine for body text |
| #C4331B text on black | 3.83:1 | AA large text | Lc -25.8 | Dividers and decoration only |
Tints and shades
A 50–950 scale built in OKLCH: the hue is held, lightness follows a Tailwind v4-like curve, and every step is kept inside the sRGB gamut. This color sits at step 600.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FAE4E0
oklch(93.6% 0.025 29.9)
-
Step 200
200
#F6CFC6
oklch(88.5% 0.046 33.2)
-
Step 300
300
#F2AD9F
oklch(80.9% 0.084 31.8)
-
Step 400
400
#E77F6B
oklch(70.7% 0.132 32)
-
Step 500
500
#DD5942
oklch(63.1% 0.17 32)
-
Step 600
600 (this color)
#C4331B
oklch(54.3% 0.185 32)
-
Step 700
700
#AD2812
oklch(49.1% 0.173 31.9)
-
Step 800
800
#8C2413
oklch(42.6% 0.142 32)
-
Step 900
900
#712417
oklch(37.7% 0.112 32)
-
Step 950
950
#43160F
oklch(27% 0.072 31.1)
#C4331B with color blindness
Simulated with the Machado et al. (2009) model. ΔE is how far the color moves: below about 0.02 you would not notice a change.
| Vision | Seen as | Shift (ΔE) |
|---|---|---|
| Protanopia (no red cones) | #605516 | 0.196 |
| Deuteranopia (no green cones) | #837511 | 0.178 |
| Tritanopia (no blue cones) | #D8002F | 0.054 |
| Achromatopsia (no color) | #696969 | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C4331B
#C4331B
oklch(54.3% 0.185 32)
- #007E8F
#007E8F
oklch(54.4% 0.094 211.2)
Analogous
Neighbouring hues, 30° either side.
Split complementary
The two hues beside the complement (150° and 210°).
Triadic
Three hues spaced 120° apart.
Palettes with this color
Curated palettes that contain a color within ΔE 0.04 (OKLab) of #C4331B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.027
- Dull Red #BB3F3F ΔE 0.035
- Brick Orange #C14A09 ΔE 0.042
- Rusty Red #AF2F0D ΔE 0.046
- Scarlet #BE0119 ΔE 0.047
- Firebrick #B22222 ΔE 0.049
- Burnt Orange #C04E01 ΔE 0.051
- Cherry #CF0234 ΔE 0.051
Use #C4331B in your product
Turn it into light and dark UI roles checked for contrast, then export to Tailwind v4, shadcn/ui, CSS or design tokens.