#C51B08
Closest named color: Scarlet (#BE0119). oklch(52.6% 0.203 30.4), rgb(197, 27, 8).
Aa
White text reads best on this color (5.94:1).
About this color
#C51B08 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.203 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Scarlet (#BE0119), ΔE 0.027 away. White text reads best on it, at 5.94:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.203) |
| Temperature | warm |
| Nearest name | Scarlet (#BE0119) |
| Black text | 3.53:1 |
| White text | 5.94:1 |
Values
| HEX | #C51B08 |
| RGB | rgb(197, 27, 8) |
| HSL | hsl(6, 92%, 40%) |
| OKLCH | oklch(52.6% 0.203 30.4) |
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 #C51B08 | 5.94:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #C51B08 | 3.53:1 | AA large text | Lc 26.4 | Dividers and decoration only |
| #C51B08 text on white | 5.94:1 | AA | Lc 77.6 | Fine for body text |
| #C51B08 text on black | 3.53:1 | 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
#FBE4DF
oklch(93.6% 0.026 32.2)
-
Step 200
200
#F9CDC5
oklch(88.4% 0.051 30.1)
-
Step 300
300
#F6AB9D
oklch(81% 0.091 30.9)
-
Step 400
400
#EE7A67
oklch(70.8% 0.147 30.7)
-
Step 500
500
#E4503D
oklch(63% 0.187 30.3)
-
Step 600
600 (this color)
#C51B08
oklch(52.6% 0.203 30.4)
-
Step 700
700
#B31807
oklch(49% 0.189 30.4)
-
Step 800
800
#911A0D
oklch(42.6% 0.156 30.5)
-
Step 900
900
#751F14
oklch(37.8% 0.122 30.7)
-
Step 950
950
#45140D
oklch(27.1% 0.077 30.8)
#C51B08 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) | #574C00 | 0.221 |
| Deuteranopia (no green cones) | #7F7100 | 0.197 |
| Tritanopia (no blue cones) | #DA001B | 0.043 |
| Achromatopsia (no color) | #646464 | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #C51B08
#C51B08
oklch(52.6% 0.203 30.4)
- #007888
#007888
oklch(52.5% 0.091 210.9)
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 #C51B08, closest first.
No curated palette has a color within ΔE 0.04 of #C51B08.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Scarlet #BE0119 ΔE 0.027
- Lipstick Red #C0022F ΔE 0.038
- Firebrick #B22222 ΔE 0.040
- Cherry #CF0234 ΔE 0.042
- Rusty Red #AF2F0D ΔE 0.044
- Sinopia #BB3E03 ΔE 0.045
- Rufous #AE2012 ΔE 0.047
- Dull Red #BB3F3F ΔE 0.051
Use #C51B08 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.