#B10427
Closest named color: Rouge (#AB1239). oklch(48.2% 0.192 21.9), rgb(177, 4, 39).
Aa
White text reads best on this color (7.20:1).
About this color
#B10427 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.192 and its hue 22°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.023 away. White text reads best on it, at 7.20:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.192) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.91:1 |
| White text | 7.20:1 |
Values
| HEX | #B10427 |
| RGB | rgb(177, 4, 39) |
| HSL | hsl(348, 96%, 35%) |
| OKLCH | oklch(48.2% 0.192 21.9) |
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 #B10427 | 7.20:1 | AAA | Lc -87.6 | Fine for body text |
| Black text on #B10427 | 2.91:1 | Fails | Lc 21.5 | Dividers and decoration only |
| #B10427 text on white | 7.20:1 | AAA | Lc 82.5 | Fine for body text |
| #B10427 text on black | 2.91:1 | Fails | Lc -19.4 | 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
#FCE3E2
oklch(93.6% 0.028 20.4)
-
Step 200
200
#FACCCA
oklch(88.4% 0.052 21.1)
-
Step 300
300
#F7A9A6
oklch(80.9% 0.093 21.8)
-
Step 400
400
#EF7776
oklch(70.8% 0.148 22)
-
Step 500
500
#E64B53
oklch(63.1% 0.191 21.7)
-
Step 600
600
#D12137
oklch(55.6% 0.207 21.9)
-
Step 700
700 (this color)
#B10427
oklch(48.2% 0.192 21.9)
-
Step 800
800
#921324
oklch(42.6% 0.159 21.6)
-
Step 900
900
#761B22
oklch(37.7% 0.125 21.6)
-
Step 950
950
#451214
oklch(26.9% 0.078 21.9)
#B10427 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) | #484126 | 0.213 |
| Deuteranopia (no green cones) | #6F6320 | 0.193 |
| Tritanopia (no blue cones) | #C30018 | 0.040 |
| Achromatopsia (no color) | #575757 | 0.194 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B10427
#B10427
oklch(48.2% 0.192 21.9)
- #006B72
#006B72
oklch(48.1% 0.082 202.7)
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 #B10427, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.023
- Firebrick #B22222 ΔE 0.025
- Scarlet #BE0119 ΔE 0.030
- Rufous #AE2012 ΔE 0.030
- Lipstick Red #C0022F ΔE 0.033
- Brown #A52A2A ΔE 0.034
- Rose Red #BE013C ΔE 0.036
- Rust Red #AA2704 ΔE 0.043
Use #B10427 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.