#C03D1B
Closest named color: Sinopia (#BB3E03). oklch(54.6% 0.173 35), rgb(192, 61, 27).
Aa
White text reads best on this color (5.35:1).
About this color
#C03D1B is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.173 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.015 away. White text reads best on it, at 5.35:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.173) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.92:1 |
| White text | 5.35:1 |
Values
| HEX | #C03D1B |
| RGB | rgb(192, 61, 27) |
| HSL | hsl(12, 75%, 43%) |
| OKLCH | oklch(54.6% 0.173 35) |
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 #C03D1B | 5.35:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #C03D1B | 3.92:1 | AA large text | Lc 28.6 | Dividers and decoration only |
| #C03D1B text on white | 5.35:1 | AA | Lc 75.5 | Fine for body text |
| #C03D1B text on black | 3.92:1 | AA large text | Lc -26.2 | 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
#F8E5E0
oklch(93.6% 0.022 35.1)
-
Step 200
200
#F4D0C6
oklch(88.5% 0.043 36)
-
Step 300
300
#EEAF9F
oklch(80.9% 0.078 34.7)
-
Step 400
400
#E3826A
oklch(70.7% 0.125 34.8)
-
Step 500
500
#D85F41
oklch(63.1% 0.159 35.1)
-
Step 600
600 (this color)
#C03D1B
oklch(54.6% 0.173 35)
-
Step 700
700
#A83110
oklch(49.1% 0.161 35.1)
-
Step 800
800
#892A12
oklch(42.7% 0.134 34.9)
-
Step 900
900
#6E2817
oklch(37.7% 0.104 34.9)
-
Step 950
950
#41180E
oklch(27% 0.067 34.9)
#C03D1B 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) | #645814 | 0.178 |
| Deuteranopia (no green cones) | #847613 | 0.163 |
| Tritanopia (no blue cones) | #D40C37 | 0.067 |
| Achromatopsia (no color) | #6B6B6B | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C03D1B
#C03D1B
oklch(54.6% 0.173 35)
- #007E93
#007E93
oklch(54.6% 0.096 214.7)
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 #C03D1B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.015
- Brick Orange #C14A09 ΔE 0.028
- Dull Red #BB3F3F ΔE 0.034
- Burnt Orange #C04E01 ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.045
- Burnt Siena #B75203 ΔE 0.046
- Dusty Red #B9484E ΔE 0.050
- Rust Orange #C45508 ΔE 0.051
Use #C03D1B 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.