#C51818
Closest named color: Scarlet (#BE0119). oklch(52.6% 0.203 28), rgb(197, 24, 24).
Aa
White text reads best on this color (5.96:1).
About this color
#C51818 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.203 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Scarlet (#BE0119), ΔE 0.022 away. White text reads best on it, at 5.96:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.203) |
| Temperature | warm |
| Nearest name | Scarlet (#BE0119) |
| Black text | 3.51:1 |
| White text | 5.96:1 |
Values
| HEX | #C51818 |
| RGB | rgb(197, 24, 24) |
| HSL | hsl(0, 78%, 43%) |
| OKLCH | oklch(52.6% 0.203 28) |
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 #C51818 | 5.96:1 | AA | Lc -83.0 | Fine for body text |
| Black text on #C51818 | 3.51:1 | AA large text | Lc 26.4 | Dividers and decoration only |
| #C51818 text on white | 5.96:1 | AA | Lc 77.7 | Fine for body text |
| #C51818 text on black | 3.51:1 | AA large text | Lc -24.1 | 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
#FEF3F1
oklch(97.2% 0.012 29.9)
-
Step 100
100
#FBE4E0
oklch(93.6% 0.026 29.4)
-
Step 200
200
#F9CDC7
oklch(88.5% 0.051 27.2)
-
Step 300
300
#F6AAA0
oklch(80.8% 0.091 27.6)
-
Step 400
400
#EE796C
oklch(70.7% 0.147 27.9)
-
Step 500
500
#E44F44
oklch(63% 0.187 27.9)
-
Step 600
600 (this color)
#C51818
oklch(52.6% 0.203 28)
-
Step 700
700
#B31616
oklch(49% 0.189 27.9)
-
Step 800
800
#921815
oklch(42.7% 0.157 28)
-
Step 900
900
#751E18
oklch(37.7% 0.122 28.3)
-
Step 950
950
#45130F
oklch(26.9% 0.078 28)
#C51818 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) | #564C14 | 0.222 |
| Deuteranopia (no green cones) | #7F7009 | 0.199 |
| Tritanopia (no blue cones) | #DA001C | 0.042 |
| Achromatopsia (no color) | #636363 | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C51818
#C51818
oklch(52.6% 0.203 28)
- #007986
#007986
oklch(52.7% 0.091 207.9)
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 #C51818, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Scarlet #BE0119 ΔE 0.022
- Lipstick Red #C0022F ΔE 0.030
- Cherry #CF0234 ΔE 0.034
- Firebrick #B22222 ΔE 0.038
- Rose Red #BE013C ΔE 0.046
- Rufous #AE2012 ΔE 0.047
- Rusty Red #AF2F0D ΔE 0.047
- Dull Red #BB3F3F ΔE 0.049
Use #C51818 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.