#C73309
Closest named color: Sinopia (#BB3E03). oklch(54.7% 0.19 34.4), rgb(199, 51, 9).
Aa
White text reads best on this color (5.37:1).
About this color
#C73309 is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.190 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.027 away. White text reads best on it, at 5.37:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.190) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.90:1 |
| White text | 5.37:1 |
Values
| HEX | #C73309 |
| RGB | rgb(199, 51, 9) |
| HSL | hsl(13, 91%, 41%) |
| OKLCH | oklch(54.7% 0.19 34.4) |
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 #C73309 | 5.37:1 | AA | Lc -80.7 | Fine for body text |
| Black text on #C73309 | 3.90:1 | AA large text | Lc 28.8 | Dividers and decoration only |
| #C73309 text on white | 5.37:1 | AA | Lc 75.3 | Fine for body text |
| #C73309 text on black | 3.90:1 | AA large text | Lc -26.4 | 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
#FAE4DF
oklch(93.5% 0.025 32.9)
-
Step 200
200
#F7CFC5
oklch(88.6% 0.047 34.3)
-
Step 300
300
#F2AD9C
oklch(80.9% 0.085 34.3)
-
Step 400
400
#E97E65
oklch(70.7% 0.138 34.2)
-
Step 500
500
#DF5839
oklch(63.2% 0.175 34.4)
-
Step 600
600 (this color)
#C73309
oklch(54.7% 0.19 34.4)
-
Step 700
700
#AE2800
oklch(49.2% 0.175 34.4)
-
Step 800
800
#8D2306
oklch(42.6% 0.146 34.6)
-
Step 900
900
#722411
oklch(37.8% 0.114 34.7)
-
Step 950
950
#43160C
oklch(27% 0.072 34.1)
#C73309 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) | #625500 | 0.198 |
| Deuteranopia (no green cones) | #867600 | 0.178 |
| Tritanopia (no blue cones) | #DC002D | 0.058 |
| Achromatopsia (no color) | #6A6A6A | 0.192 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C73309
#C73309
oklch(54.7% 0.19 34.4)
- #007F93
#007F93
oklch(54.8% 0.096 213.7)
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 #C73309, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.027
- Brick Orange #C14A09 ΔE 0.038
- Dull Red #BB3F3F ΔE 0.043
- Burnt Orange #C04E01 ΔE 0.046
- Rusty Red #AF2F0D ΔE 0.051
- Scarlet #BE0119 ΔE 0.053
- Cherry #CF0234 ΔE 0.056
- Firebrick #B22222 ΔE 0.057
Use #C73309 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.