#B31031
Closest named color: Rouge (#AB1239). oklch(49.1% 0.189 19.6), rgb(179, 16, 49).
Aa
White text reads best on this color (6.91:1).
About this color
#B31031 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.189 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.020 away. White text reads best on it, at 6.91:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.189) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 3.03:1 |
| White text | 6.91:1 |
Values
| HEX | #B31031 |
| RGB | rgb(179, 16, 49) |
| HSL | hsl(348, 84%, 38%) |
| OKLCH | oklch(49.1% 0.189 19.6) |
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 #B31031 | 6.91:1 | AA | Lc -86.9 | Fine for body text |
| Black text on #B31031 | 3.03:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #B31031 text on white | 6.91:1 | AA | Lc 81.8 | Fine for body text |
| #B31031 text on black | 3.03:1 | AA large text | Lc -20.1 | 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 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
#EE777B
oklch(70.7% 0.147 19.5)
-
Step 500
500
#E44C59
oklch(63% 0.187 19.5)
-
Step 600
600
#D0233F
oklch(55.7% 0.204 19.5)
-
Step 700
700 (this color)
#B31031
oklch(49.1% 0.189 19.6)
-
Step 800
800
#911529
oklch(42.6% 0.156 19.6)
-
Step 900
900
#751C26
oklch(37.7% 0.122 19.3)
-
Step 950
950
#451216
oklch(27% 0.078 19.6)
#B31031 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) | #4A4531 | 0.210 |
| Deuteranopia (no green cones) | #70652B | 0.191 |
| Tritanopia (no blue cones) | #C50021 | 0.039 |
| Achromatopsia (no color) | #5A5A5A | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B31031
#B31031
oklch(49.1% 0.189 19.6)
- #006F73
#006F73
oklch(49.2% 0.084 199.2)
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 #B31031, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.020
- Lipstick Red #C0022F ΔE 0.026
- Firebrick #B22222 ΔE 0.026
- Rose Red #BE013C ΔE 0.026
- Scarlet #BE0119 ΔE 0.030
- Rufous #AE2012 ΔE 0.036
- Brown #A52A2A ΔE 0.036
- Raspberry #B00149 ΔE 0.038
Use #B31031 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.