#B10B29
Closest named color: Rouge (#AB1239). oklch(48.4% 0.19 21.7), rgb(177, 11, 41).
Aa
White text reads best on this color (7.12:1).
About this color
#B10B29 is a medium-dark, vivid red. In OKLCH its lightness is 48%, its chroma 0.190 and its hue 22°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.022 away. White text reads best on it, at 7.12:1.
| Hue family | Reds |
| Lightness | medium-dark (48%) |
| Chroma | vivid (0.190) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 2.94:1 |
| White text | 7.12:1 |
Values
| HEX | #B10B29 |
| RGB | rgb(177, 11, 41) |
| HSL | hsl(349, 88%, 37%) |
| OKLCH | oklch(48.4% 0.19 21.7) |
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 #B10B29 | 7.12:1 | AAA | Lc -87.5 | Fine for body text |
| Black text on #B10B29 | 2.94:1 | Fails | Lc 21.6 | Dividers and decoration only |
| #B10B29 text on white | 7.12:1 | AAA | Lc 82.4 | Fine for body text |
| #B10B29 text on black | 2.94:1 | Fails | Lc -19.5 | 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
#FBE3E2
oklch(93.5% 0.026 20.5)
-
Step 200
200
#F9CDCA
oklch(88.5% 0.05 22.7)
-
Step 300
300
#F6A9A6
oklch(80.8% 0.091 21.8)
-
Step 400
400
#EE7777
oklch(70.7% 0.147 21.5)
-
Step 500
500
#E54D54
oklch(63.2% 0.188 21.8)
-
Step 600
600
#D02439
oklch(55.6% 0.204 21.6)
-
Step 700
700 (this color)
#B10B29
oklch(48.4% 0.19 21.7)
-
Step 800
800
#921525
oklch(42.7% 0.158 21.5)
-
Step 900
900
#751C22
oklch(37.7% 0.123 21.9)
-
Step 950
950
#451315
oklch(27.1% 0.077 21.6)
#B10B29 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) | #494228 | 0.210 |
| Deuteranopia (no green cones) | #6F6423 | 0.192 |
| Tritanopia (no blue cones) | #C3001B | 0.039 |
| Achromatopsia (no color) | #585858 | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B10B29
#B10B29
oklch(48.4% 0.19 21.7)
- #006C72
#006C72
oklch(48.3% 0.082 201.5)
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 #B10B29, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.022
- Firebrick #B22222 ΔE 0.023
- Rufous #AE2012 ΔE 0.029
- Scarlet #BE0119 ΔE 0.030
- Lipstick Red #C0022F ΔE 0.031
- Brown #A52A2A ΔE 0.033
- Rose Red #BE013C ΔE 0.035
- Rust Red #AA2704 ΔE 0.042
Use #B10B29 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.