#B10E31
Closest named color: Rouge (#AB1239). oklch(48.6% 0.188 19.2), rgb(177, 14, 49).
Aa
White text reads best on this color (7.05:1).
About this color
#B10E31 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.188 and its hue 19°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.016 away. White text reads best on it, at 7.05:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.188) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.97:1 |
| White text | 7.05:1 |
Values
| HEX | #B10E31 |
| RGB | rgb(177, 14, 49) |
| HSL | hsl(347, 85%, 37%) |
| OKLCH | oklch(48.6% 0.188 19.2) |
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 #B10E31 | 7.05:1 | AAA | Lc -87.4 | Fine for body text |
| Black text on #B10E31 | 2.97:1 | Fails | Lc 21.7 | Dividers and decoration only |
| #B10E31 text on white | 7.05:1 | AAA | Lc 82.3 | Fine for body text |
| #B10E31 text on black | 2.97:1 | Fails | Lc -19.6 | 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 700.
-
Step 50
50
#FEF2F2
oklch(97.1% 0.013 17.4)
-
Step 100
100
#FBE3E3
oklch(93.5% 0.026 17.6)
-
Step 200
200
#F9CCCC
oklch(88.4% 0.051 18.2)
-
Step 300
300
#F6A9A9
oklch(80.9% 0.091 19.2)
-
Step 400
400
#ED777C
oklch(70.6% 0.146 18.9)
-
Step 500
500
#E44D5A
oklch(63.2% 0.186 19.4)
-
Step 600
600
#CF2440
oklch(55.5% 0.203 19.2)
-
Step 700
700 (this color)
#B10E31
oklch(48.6% 0.188 19.2)
-
Step 800
800
#91162A
oklch(42.7% 0.156 19.3)
-
Step 900
900
#751C26
oklch(37.7% 0.122 19.3)
-
Step 950
950
#451317
oklch(27.1% 0.077 19.3)
#B10E31 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) | #484331 | 0.210 |
| Deuteranopia (no green cones) | #6F642C | 0.190 |
| Tritanopia (no blue cones) | #C30020 | 0.040 |
| Achromatopsia (no color) | #595959 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B10E31
#B10E31
oklch(48.6% 0.188 19.2)
- #006D71
#006D71
oklch(48.6% 0.083 199.2)
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 #B10E31, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.016
- Firebrick #B22222 ΔE 0.028
- Rose Red #BE013C ΔE 0.030
- Lipstick Red #C0022F ΔE 0.030
- Scarlet #BE0119 ΔE 0.034
- Brown #A52A2A ΔE 0.035
- Raspberry #B00149 ΔE 0.036
- Rufous #AE2012 ΔE 0.037
Use #B10E31 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.