#B31E2D
Closest named color: Firebrick (#B22222). oklch(49.7% 0.182 22.7), rgb(179, 30, 45).
Aa
White text reads best on this color (6.68:1).
About this color
#B31E2D is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.182 and its hue 23°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.013 away. White text reads best on it, at 6.68:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.182) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.14:1 |
| White text | 6.68:1 |
Values
| HEX | #B31E2D |
| RGB | rgb(179, 30, 45) |
| HSL | hsl(354, 71%, 41%) |
| OKLCH | oklch(49.7% 0.182 22.7) |
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 #B31E2D | 6.68:1 | AA | Lc -86.4 | Fine for body text |
| Black text on #B31E2D | 3.14:1 | AA large text | Lc 22.8 | Dividers and decoration only |
| #B31E2D text on white | 6.68:1 | AA | Lc 81.3 | Fine for body text |
| #B31E2D text on black | 3.14:1 | AA large text | Lc -20.6 | 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
#FDF3F2
oklch(97.2% 0.011 24.3)
-
Step 100
100
#FBE4E2
oklch(93.7% 0.025 23.6)
-
Step 200
200
#F8CDCA
oklch(88.4% 0.049 22.8)
-
Step 300
300
#F5AAA6
oklch(80.9% 0.089 22.6)
-
Step 400
400
#EB7A77
oklch(70.7% 0.14 22.8)
-
Step 500
500
#E25154
oklch(63.2% 0.181 22.7)
-
Step 600
600
#CD2C39
oklch(55.6% 0.196 22.7)
-
Step 700
700 (this color)
#B31E2D
oklch(49.7% 0.182 22.7)
-
Step 800
800
#901B25
oklch(42.8% 0.151 22.6)
-
Step 900
900
#731F22
oklch(37.6% 0.117 22.9)
-
Step 950
950
#441415
oklch(27% 0.074 22.3)
#B31E2D 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) | #4E482C | 0.201 |
| Deuteranopia (no green cones) | #736727 | 0.182 |
| Tritanopia (no blue cones) | #C50026 | 0.035 |
| Achromatopsia (no color) | #5C5C5C | 0.184 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B31E2D
#B31E2D
oklch(49.7% 0.182 22.7)
- #007078
#007078
oklch(49.7% 0.085 203.5)
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 #B31E2D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.013
- Rufous #AE2012 ΔE 0.026
- Scarlet #BE0119 ΔE 0.026
- Lipstick Red #C0022F ΔE 0.027
- Brown #A52A2A ΔE 0.029
- Rouge #AB1239 ΔE 0.030
- Rose Red #BE013C ΔE 0.033
- Rusty Red #AF2F0D ΔE 0.038
Use #B31E2D 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.