#C43403
Closest named color: Sinopia (#BB3E03). oklch(54.3% 0.187 35.4), rgb(196, 52, 3).
Aa
White text reads best on this color (5.46:1).
About this color
#C43403 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.187 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 5.46:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.187) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.83:1 |
| White text | 5.46:1 |
Values
| HEX | #C43403 |
| RGB | rgb(196, 52, 3) |
| HSL | hsl(15, 97%, 39%) |
| OKLCH | oklch(54.3% 0.187 35.4) |
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 #C43403 | 5.46:1 | AA | Lc -81.2 | Fine for body text |
| Black text on #C43403 | 3.83:1 | AA large text | Lc 28.2 | Dividers and decoration only |
| #C43403 text on white | 5.46:1 | AA | Lc 75.8 | Fine for body text |
| #C43403 text on black | 3.83:1 | AA large text | Lc -25.9 | 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
#FDF3F0
oklch(97.1% 0.012 37.4)
-
Step 100
100
#FAE5DF
oklch(93.7% 0.025 36.5)
-
Step 200
200
#F6CFC4
oklch(88.5% 0.047 36.3)
-
Step 300
300
#F1AE9C
oklch(80.9% 0.083 35.6)
-
Step 400
400
#E77F65
oklch(70.6% 0.134 35)
-
Step 500
500
#DD5A38
oklch(63.1% 0.172 35.5)
-
Step 600
600 (this color)
#C43403
oklch(54.3% 0.187 35.4)
-
Step 700
700
#AC2B00
oklch(49.1% 0.171 35.3)
-
Step 800
800
#8C2505
oklch(42.6% 0.143 35.6)
-
Step 900
900
#712511
oklch(37.8% 0.112 35.4)
-
Step 950
950
#43170C
oklch(27.1% 0.071 35.2)
#C43403 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) | #615500 | 0.194 |
| Deuteranopia (no green cones) | #847500 | 0.174 |
| Tritanopia (no blue cones) | #D8002D | 0.060 |
| Achromatopsia (no color) | #696969 | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C43403
#C43403
oklch(54.3% 0.187 35.4)
- #007D93
#007D93
oklch(54.3% 0.096 215.8)
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 #C43403, 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 0.036
- Dull Red #BB3F3F ΔE 0.043
- Burnt Orange #C04E01 ΔE 0.044
- Rusty Red #AF2F0D ΔE 0.045
- Scarlet #BE0119 ΔE 0.053
- Firebrick #B22222 ΔE 0.054
- Burnt Siena #B75203 ΔE 0.055
Use #C43403 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.