#C63728
Closest named color: Dull Red (#BB3F3F). oklch(55.1% 0.182 29.9), rgb(198, 55, 40).
Aa
White text reads best on this color (5.27:1).
About this color
#C63728 is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.182 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.029 away. White text reads best on it, at 5.27:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.182) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.97:1 |
| White text | 5.27:1 |
Values
| HEX | #C63728 |
| RGB | rgb(198, 55, 40) |
| HSL | hsl(6, 66%, 47%) |
| OKLCH | oklch(55.1% 0.182 29.9) |
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 #C63728 | 5.27:1 | AA | Lc -80.3 | Fine for body text |
| Black text on #C63728 | 3.97:1 | AA large text | Lc 29.1 | Dividers and decoration only |
| #C63728 text on white | 5.27:1 | AA | Lc 74.9 | Content text, not long reading |
| #C63728 text on black | 3.97:1 | AA large text | Lc -26.8 | 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
#F9E4E1
oklch(93.5% 0.023 27.3)
-
Step 200
200
#F6CFC8
oklch(88.6% 0.045 29.9)
-
Step 300
300
#F1ADA1
oklch(80.9% 0.082 30.2)
-
Step 400
400
#E77F6F
oklch(70.8% 0.131 29.9)
-
Step 500
500
#DC5948
oklch(63% 0.168 29.9)
-
Step 600
600 (this color)
#C63728
oklch(55.1% 0.182 29.9)
-
Step 700
700
#AC291C
oklch(49.1% 0.169 30)
-
Step 800
800
#8C251A
oklch(42.8% 0.14 29.9)
-
Step 900
900
#70241B
oklch(37.6% 0.109 29.8)
-
Step 950
950
#421711
oklch(27% 0.068 30.2)
#C63728 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) | #625825 | 0.193 |
| Deuteranopia (no green cones) | #857721 | 0.177 |
| Tritanopia (no blue cones) | #DA0035 | 0.055 |
| Achromatopsia (no color) | #6C6C6C | 0.183 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C63728
#C63728
oklch(55.1% 0.182 29.9)
- #008191
#008191
oklch(55.3% 0.096 209.9)
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 #C63728, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.029
- Sinopia #BB3E03 ΔE 0.034
- Brick Orange #C14A09 ΔE 0.042
- Dusty Red #B9484E ΔE 0.046
- Cherry #CF0234 ΔE 0.049
- Burnt Orange #C04E01 ΔE 0.051
- Faded Red #D3494E ΔE 0.053
- Scarlet #BE0119 ΔE 0.053
Use #C63728 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.