#C23303
Closest named color: Sinopia (#BB3E03). oklch(53.8% 0.186 35.3), rgb(194, 51, 3).
Aa
White text reads best on this color (5.57:1).
About this color
#C23303 is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.186 and its hue 35°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.020 away. White text reads best on it, at 5.57:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.186) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.76:1 |
| White text | 5.57:1 |
Values
| HEX | #C23303 |
| RGB | rgb(194, 51, 3) |
| HSL | hsl(15, 97%, 39%) |
| OKLCH | oklch(53.8% 0.186 35.3) |
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 #C23303 | 5.57:1 | AA | Lc -81.7 | Fine for body text |
| Black text on #C23303 | 3.76:1 | AA large text | Lc 27.7 | Dividers and decoration only |
| #C23303 text on white | 5.57:1 | AA | Lc 76.4 | Fine for body text |
| #C23303 text on black | 3.76:1 | AA large text | Lc -25.3 | 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
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F6CFC5
oklch(88.5% 0.046 34.7)
-
Step 300
300
#F1AE9C
oklch(80.9% 0.083 35.6)
-
Step 400
400
#E78065
oklch(70.8% 0.133 35.6)
-
Step 500
500
#DD5A39
oklch(63.1% 0.171 35.2)
-
Step 600
600 (this color)
#C23303
oklch(53.8% 0.186 35.3)
-
Step 700
700
#AC2B00
oklch(49.1% 0.171 35.3)
-
Step 800
800
#8C2507
oklch(42.7% 0.143 35.2)
-
Step 900
900
#712511
oklch(37.8% 0.112 35.4)
-
Step 950
950
#42170C
oklch(27% 0.07 35.4)
#C23303 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) | #605400 | 0.193 |
| Deuteranopia (no green cones) | #837400 | 0.173 |
| Tritanopia (no blue cones) | #D6002D | 0.060 |
| Achromatopsia (no color) | #686868 | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C23303
#C23303
oklch(53.8% 0.186 35.3)
- #007C91
#007C91
oklch(54% 0.095 215)
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 #C23303, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.020
- Brick Orange #C14A09 ΔE 0.038
- Rusty Red #AF2F0D ΔE 0.041
- Dull Red #BB3F3F ΔE 0.043
- Burnt Orange #C04E01 ΔE 0.046
- Scarlet #BE0119 ΔE 0.050
- Firebrick #B22222 ΔE 0.050
- Rufous #AE2012 ΔE 0.055
Use #C23303 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.