#B31535
Closest named color: Rouge (#AB1239). oklch(49.3% 0.187 18.6), rgb(179, 21, 53).
Aa
White text reads best on this color (6.82:1).
About this color
#B31535 is a medium-dark, vivid red. In OKLCH its lightness is 49%, its chroma 0.187 and its hue 19°. Its hue sits on the warm side of the wheel. The nearest named color is Rouge (#AB1239), ΔE 0.019 away. White text reads best on it, at 6.82:1.
| Hue family | Reds |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.187) |
| Temperature | warm |
| Nearest name | Rouge (#AB1239) |
| Black text | 3.07:1 |
| White text | 6.82:1 |
Values
| HEX | #B31535 |
| RGB | rgb(179, 21, 53) |
| HSL | hsl(348, 79%, 39%) |
| OKLCH | oklch(49.3% 0.187 18.6) |
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 #B31535 | 6.82:1 | AA | Lc -86.7 | Fine for body text |
| Black text on #B31535 | 3.07:1 | AA large text | Lc 22.4 | Dividers and decoration only |
| #B31535 text on white | 6.82:1 | AA | Lc 81.6 | Fine for body text |
| #B31535 text on black | 3.07:1 | AA large text | Lc -20.3 | 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
#F9CDCC
oklch(88.6% 0.05 19.7)
-
Step 300
300
#F6A9AA
oklch(80.9% 0.091 18.4)
-
Step 400
400
#ED777D
oklch(70.6% 0.146 18.4)
-
Step 500
500
#E34D5C
oklch(63% 0.185 18.5)
-
Step 600
600
#CE2642
oklch(55.5% 0.2 18.7)
-
Step 700
700 (this color)
#B31535
oklch(49.3% 0.187 18.6)
-
Step 800
800
#91172C
oklch(42.8% 0.155 18.5)
-
Step 900
900
#741D27
oklch(37.7% 0.12 18.9)
-
Step 950
950
#451317
oklch(27.1% 0.077 19.3)
#B31535 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) | #4A4635 | 0.209 |
| Deuteranopia (no green cones) | #716630 | 0.189 |
| Tritanopia (no blue cones) | #C50025 | 0.039 |
| Achromatopsia (no color) | #5B5B5B | 0.188 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B31535
#B31535
oklch(49.3% 0.187 18.6)
- #007073
#007073
oklch(49.5% 0.084 198)
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 #B31535, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rouge #AB1239 ΔE 0.019
- Rose Red #BE013C ΔE 0.024
- Lipstick Red #C0022F ΔE 0.026
- Firebrick #B22222 ΔE 0.028
- Scarlet #BE0119 ΔE 0.033
- Raspberry #B00149 ΔE 0.035
- Brown #A52A2A ΔE 0.037
- Rufous #AE2012 ΔE 0.039
Use #B31535 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.