#C51F42
Closest named color: Ruby (#CA0147). oklch(53.5% 0.197 16.9), rgb(197, 31, 66).
Aa
White text reads best on this color (5.75:1).
About this color
#C51F42 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.197 and its hue 17°. Its hue sits on the warm side of the wheel. The nearest named color is Ruby (#CA0147), ΔE 0.020 away. White text reads best on it, at 5.75:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.197) |
| Temperature | warm |
| Nearest name | Ruby (#CA0147) |
| Black text | 3.64:1 |
| White text | 5.75:1 |
Values
| HEX | #C51F42 |
| RGB | rgb(197, 31, 66) |
| HSL | hsl(347, 73%, 45%) |
| OKLCH | oklch(53.5% 0.197 16.9) |
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 #C51F42 | 5.75:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #C51F42 | 3.64:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #C51F42 text on white | 5.75:1 | AA | Lc 77.0 | Fine for body text |
| #C51F42 text on black | 3.64:1 | AA large text | Lc -24.8 | 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
#FDF2F3
oklch(97% 0.012 11)
-
Step 100
100
#FBE3E4
oklch(93.6% 0.026 14.7)
-
Step 200
200
#F8CDCE
oklch(88.6% 0.049 16.5)
-
Step 300
300
#F5AAAC
oklch(81% 0.089 17.4)
-
Step 400
400
#EB7881
oklch(70.6% 0.142 16.5)
-
Step 500
500
#E14F61
oklch(63% 0.181 16.8)
-
Step 600
600 (this color)
#C51F42
oklch(53.5% 0.197 16.9)
-
Step 700
700
#B11839
oklch(49.2% 0.184 17.1)
-
Step 800
800
#8F1930
oklch(42.6% 0.152 16.6)
-
Step 900
900
#731E2A
oklch(37.7% 0.118 17)
-
Step 950
950
#441319
oklch(27% 0.075 16.6)
#C51F42 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) | #545042 | 0.219 |
| Deuteranopia (no green cones) | #7D723D | 0.200 |
| Tritanopia (no blue cones) | #D8002F | 0.041 |
| Achromatopsia (no color) | #666666 | 0.199 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C51F42
#C51F42
oklch(53.5% 0.197 16.9)
- #007D7F
#007D7F
oklch(53.5% 0.091 196.7)
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 #C51F42, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ruby #CA0147 ΔE 0.020
- Cherry #CF0234 ΔE 0.024
- Rose Red #BE013C ΔE 0.026
- Lipstick Red #C0022F ΔE 0.028
- Lipstick #D5174E ΔE 0.035
- Scarlet #BE0119 ΔE 0.044
- Dull Red #BB3F3F ΔE 0.044
- Crimson #DC143C ΔE 0.046
Use #C51F42 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.