#C03611
Closest named color: Sinopia (#BB3E03). oklch(53.8% 0.18 34.7), rgb(192, 54, 17).
Aa
White text reads best on this color (5.55:1).
About this color
#C03611 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.180 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.017 away. White text reads best on it, at 5.55:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.180) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.77:1 |
| White text | 5.55:1 |
Values
| HEX | #C03611 |
| RGB | rgb(192, 54, 17) |
| HSL | hsl(13, 84%, 41%) |
| OKLCH | oklch(53.8% 0.18 34.7) |
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 #C03611 | 5.55:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #C03611 | 3.77:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #C03611 text on white | 5.55:1 | AA | Lc 76.5 | Fine for body text |
| #C03611 text on black | 3.77:1 | AA large text | Lc -25.3 | 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
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F5CFC6
oklch(88.4% 0.045 33.5)
-
Step 300
300
#F0AE9E
oklch(80.9% 0.081 34.1)
-
Step 400
400
#E58168
oklch(70.7% 0.129 35)
-
Step 500
500
#DB5C3E
oklch(63.1% 0.166 34.6)
-
Step 600
600 (this color)
#C03611
oklch(53.8% 0.18 34.7)
-
Step 700
700
#AB2D09
oklch(49.2% 0.168 34.7)
-
Step 800
800
#8B270E
oklch(42.7% 0.139 34.5)
-
Step 900
900
#702615
oklch(37.8% 0.109 34.3)
-
Step 950
950
#42170D
oklch(27% 0.07 34.5)
#C03611 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) | #605507 | 0.189 |
| Deuteranopia (no green cones) | #827303 | 0.169 |
| Tritanopia (no blue cones) | #D40030 | 0.062 |
| Achromatopsia (no color) | #686868 | 0.182 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C03611
#C03611
oklch(53.8% 0.18 34.7)
- #007C90
#007C90
oklch(53.9% 0.095 214.1)
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 #C03611, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.017
- Brick Orange #C14A09 ΔE 0.036
- Dull Red #BB3F3F ΔE 0.038
- Rusty Red #AF2F0D ΔE 0.039
- Burnt Orange #C04E01 ΔE 0.045
- Firebrick #B22222 ΔE 0.048
- Scarlet #BE0119 ΔE 0.051
- Burnt Siena #B75203 ΔE 0.053
Use #C03611 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.