#C63037
Closest named color: Dull Red (#BB3F3F). oklch(54.7% 0.186 23.7), rgb(198, 48, 55).
Aa
White text reads best on this color (5.41:1).
About this color
#C63037 is a medium-dark, vivid red. In OKLCH its lightness is 55%, its chroma 0.186 and its hue 24°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.026 away. White text reads best on it, at 5.41:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.186) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.87:1 |
| White text | 5.41:1 |
Values
| HEX | #C63037 |
| RGB | rgb(198, 48, 55) |
| HSL | hsl(357, 61%, 48%) |
| OKLCH | oklch(54.7% 0.186 23.7) |
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 #C63037 | 5.41:1 | AA | Lc -80.9 | Fine for body text |
| Black text on #C63037 | 3.87:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #C63037 text on white | 5.41:1 | AA | Lc 75.6 | Fine for body text |
| #C63037 text on black | 3.87:1 | AA large text | Lc -26.2 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FAE4E2
oklch(93.6% 0.024 23.9)
-
Step 200
200
#F7CECA
oklch(88.5% 0.047 24.6)
-
Step 300
300
#F2ACA7
oklch(80.9% 0.083 23.6)
-
Step 400
400
#E87C78
oklch(70.6% 0.134 23.3)
-
Step 500
500
#DE5655
oklch(63.2% 0.171 23.7)
-
Step 600
600 (this color)
#C63037
oklch(54.7% 0.186 23.7)
-
Step 700
700
#AE242C
oklch(49.2% 0.173 23.8)
-
Step 800
800
#8D2125
oklch(42.7% 0.143 23.9)
-
Step 900
900
#712223
oklch(37.6% 0.111 23.5)
-
Step 950
950
#431515
oklch(27% 0.072 23.2)
#C63037 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) | #5D5536 | 0.202 |
| Deuteranopia (no green cones) | #827632 | 0.186 |
| Tritanopia (no blue cones) | #DA0034 | 0.043 |
| Achromatopsia (no color) | #6A6A6A | 0.187 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C63037
#C63037
oklch(54.7% 0.186 23.7)
- #008089
#008089
oklch(54.7% 0.093 203.5)
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 #C63037, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.026
- Cherry #CF0234 ΔE 0.033
- Lipstick Red #C0022F ΔE 0.041
- Dusty Red #B9484E ΔE 0.042
- Crimson #DC143C ΔE 0.045
- Ruby #CA0147 ΔE 0.046
- Scarlet #BE0119 ΔE 0.047
- Lipstick #D5174E ΔE 0.048
Use #C63037 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.