#C43C18
Closest named color: Sinopia (#BB3E03). oklch(55.2% 0.179 34.9), rgb(196, 60, 24).
Aa
White text reads best on this color (5.24:1).
About this color
#C43C18 is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.179 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.021 away. White text reads best on it, at 5.24:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.179) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 4.00:1 |
| White text | 5.24:1 |
Values
| HEX | #C43C18 |
| RGB | rgb(196, 60, 24) |
| HSL | hsl(13, 78%, 43%) |
| OKLCH | oklch(55.2% 0.179 34.9) |
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 #C43C18 | 5.24:1 | AA | Lc -80.2 | Fine for body text |
| Black text on #C43C18 | 4.00:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #C43C18 text on white | 5.24:1 | AA | Lc 74.8 | Content text, not long reading |
| #C43C18 text on black | 4.00:1 | AA large text | Lc -26.9 | 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
#EFAE9E
oklch(80.8% 0.08 34.3)
-
Step 400
400
#E58168
oklch(70.7% 0.129 35)
-
Step 500
500
#DA5D3E
oklch(63.1% 0.164 35.1)
-
Step 600
600 (this color)
#C43C18
oklch(55.2% 0.179 34.9)
-
Step 700
700
#AA2E0A
oklch(49.1% 0.166 35)
-
Step 800
800
#8A280E
oklch(42.7% 0.137 35)
-
Step 900
900
#6F2715
oklch(37.7% 0.107 35.1)
-
Step 950
950
#41180E
oklch(27% 0.067 34.9)
#C43C18 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) | #655910 | 0.185 |
| Deuteranopia (no green cones) | #86770E | 0.167 |
| Tritanopia (no blue cones) | #D80036 | 0.068 |
| Achromatopsia (no color) | #6C6C6C | 0.180 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C43C18
#C43C18
oklch(55.2% 0.179 34.9)
- #008095
#008095
oklch(55.2% 0.097 214.5)
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 #C43C18, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.021
- Brick Orange #C14A09 ΔE 0.027
- Burnt Orange #C04E01 ΔE 0.036
- Dull Red #BB3F3F ΔE 0.038
- Burnt Siena #B75203 ΔE 0.048
- Rust Orange #C45508 ΔE 0.049
- Rusty Red #AF2F0D ΔE 0.052
- Dusty Red #B9484E ΔE 0.053
Use #C43C18 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.