#C03A1C
Closest named color: Sinopia (#BB3E03). oklch(54.3% 0.176 33.8), rgb(192, 58, 28).
Aa
White text reads best on this color (5.43:1).
About this color
#C03A1C is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.176 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.018 away. White text reads best on it, at 5.43:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.176) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.86:1 |
| White text | 5.43:1 |
Values
| HEX | #C03A1C |
| RGB | rgb(192, 58, 28) |
| HSL | hsl(11, 75%, 43%) |
| OKLCH | oklch(54.3% 0.176 33.8) |
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 #C03A1C | 5.43:1 | AA | Lc -81.3 | Fine for body text |
| Black text on #C03A1C | 3.86:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #C03A1C text on white | 5.43:1 | AA | Lc 75.9 | Fine for body text |
| #C03A1C text on black | 3.86:1 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
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
#EFAF9F
oklch(81% 0.079 34.5)
-
Step 400
400
#E4816B
oklch(70.6% 0.127 33.5)
-
Step 500
500
#D95D42
oklch(63% 0.162 33.8)
-
Step 600
600 (this color)
#C03A1C
oklch(54.3% 0.176 33.8)
-
Step 700
700
#A92F13
oklch(49.1% 0.163 33.8)
-
Step 800
800
#892913
oklch(42.6% 0.135 34.1)
-
Step 900
900
#6F2718
oklch(37.8% 0.106 33.5)
-
Step 950
950
#41180F
oklch(27% 0.066 33.9)
#C03A1C 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) | #625716 | 0.183 |
| Deuteranopia (no green cones) | #837514 | 0.167 |
| Tritanopia (no blue cones) | #D40035 | 0.065 |
| Achromatopsia (no color) | #6A6A6A | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C03A1C
#C03A1C
oklch(54.3% 0.176 33.8)
- #007D91
#007D91
oklch(54.2% 0.095 214)
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 #C03A1C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.018
- Dull Red #BB3F3F ΔE 0.032
- Brick Orange #C14A09 ΔE 0.033
- Burnt Orange #C04E01 ΔE 0.042
- Rusty Red #AF2F0D ΔE 0.043
- Dusty Red #B9484E ΔE 0.050
- Burnt Siena #B75203 ΔE 0.051
- Firebrick #B22222 ΔE 0.051
Use #C03A1C 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.