#C63F42
Closest named color: Dull Red (#BB3F3F). oklch(56.3% 0.171 23.3), rgb(198, 63, 66).
Aa
White text reads best on this color (5.01:1).
About this color
#C63F42 is a medium-dark, vivid red. In OKLCH its lightness is 56%, its chroma 0.171 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.022 away. White text reads best on it, at 5.01:1.
| Hue family | Reds |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.171) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 4.19:1 |
| White text | 5.01:1 |
Values
| HEX | #C63F42 |
| RGB | rgb(198, 63, 66) |
| HSL | hsl(359, 54%, 51%) |
| OKLCH | oklch(56.3% 0.171 23.3) |
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 #C63F42 | 5.01:1 | AA | Lc -79.0 | Fine for body text |
| Black text on #C63F42 | 4.19:1 | AA large text | Lc 30.5 | Non-text elements, placeholder text |
| #C63F42 text on white | 5.01:1 | AA | Lc 73.6 | Content text, not long reading |
| #C63F42 text on black | 4.19:1 | AA large text | Lc -28.1 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F9E4E3
oklch(93.5% 0.023 20.9)
-
Step 200
200
#F4CFCC
oklch(88.5% 0.042 23.5)
-
Step 300
300
#EFAEA9
oklch(81% 0.077 23.9)
-
Step 400
400
#E3807B
oklch(70.7% 0.123 23.7)
-
Step 500
500
#D85C5A
oklch(63.1% 0.157 23.6)
-
Step 600
600 (this color)
#C63F42
oklch(56.3% 0.171 23.3)
-
Step 700
700
#A82D32
oklch(49% 0.159 23.2)
-
Step 800
800
#89272A
oklch(42.7% 0.133 23.2)
-
Step 900
900
#6E2626
oklch(37.7% 0.103 23.4)
-
Step 950
950
#411717
oklch(27% 0.066 22.5)
#C63F42 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) | #645D41 | 0.185 |
| Deuteranopia (no green cones) | #867A3E | 0.170 |
| Tritanopia (no blue cones) | #D91A41 | 0.048 |
| Achromatopsia (no color) | #6F6F6F | 0.173 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C63F42
#C63F42
oklch(56.3% 0.171 23.3)
- #00858F
#00858F
oklch(56.2% 0.096 204.1)
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 #C63F42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.022
- Dusty Red #B9484E ΔE 0.028
- Faded Red #D3494E ΔE 0.035
- Dark Coral #CF524E ΔE 0.041
- Dark Rose #B5485D ΔE 0.045
- Deep Rose #C74767 ΔE 0.047
- Cherry #CF0234 ΔE 0.051
- Crimson #DC143C ΔE 0.052
Use #C63F42 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.