#C51C3E
Closest named color: Ruby (#CA0147). oklch(53.2% 0.199 18), rgb(197, 28, 62).
Aa
White text reads best on this color (5.81:1).
About this color
#C51C3E is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.199 and its hue 18°. Its hue sits on the warm side of the wheel. The nearest named color is Ruby (#CA0147), ΔE 0.022 away. White text reads best on it, at 5.81:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.199) |
| Temperature | warm |
| Nearest name | Ruby (#CA0147) |
| Black text | 3.60:1 |
| White text | 5.81:1 |
Values
| HEX | #C51C3E |
| RGB | rgb(197, 28, 62) |
| HSL | hsl(348, 75%, 44%) |
| OKLCH | oklch(53.2% 0.199 18) |
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 #C51C3E | 5.81:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #C51C3E | 3.60:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #C51C3E text on white | 5.81:1 | AA | Lc 77.2 | Fine for body text |
| #C51C3E text on black | 3.60:1 | AA large text | Lc -24.6 | 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
#FDF2F2
oklch(97% 0.012 17.4)
-
Step 100
100
#FBE3E3
oklch(93.5% 0.026 17.6)
-
Step 200
200
#F9CDCD
oklch(88.6% 0.05 18.1)
-
Step 300
300
#F5A9AB
oklch(80.8% 0.09 17.5)
-
Step 400
400
#EC787E
oklch(70.7% 0.143 18.2)
-
Step 500
500
#E24E5E
oklch(63% 0.183 17.9)
-
Step 600
600 (this color)
#C51C3E
oklch(53.2% 0.199 18)
-
Step 700
700
#B11636
oklch(49% 0.185 18.1)
-
Step 800
800
#90182D
oklch(42.7% 0.153 18.1)
-
Step 900
900
#741D28
oklch(37.7% 0.12 18.2)
-
Step 950
950
#441318
oklch(26.9% 0.075 17.8)
#C51C3E 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) | #534F3E | 0.222 |
| Deuteranopia (no green cones) | #7D7139 | 0.200 |
| Tritanopia (no blue cones) | #D9002C | 0.042 |
| Achromatopsia (no color) | #656565 | 0.200 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C51C3E
#C51C3E
oklch(53.2% 0.199 18)
- #007C7F
#007C7F
oklch(53.2% 0.091 197.8)
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 #C51C3E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Ruby #CA0147 ΔE 0.022
- Cherry #CF0234 ΔE 0.022
- Lipstick Red #C0022F ΔE 0.024
- Rose Red #BE013C ΔE 0.024
- Lipstick #D5174E ΔE 0.038
- Scarlet #BE0119 ΔE 0.040
- Dull Red #BB3F3F ΔE 0.045
- Crimson #DC143C ΔE 0.046
Use #C51C3E 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.