#B12737
Closest named color: Firebrick (#B22222). oklch(50.2% 0.173 20.4), rgb(177, 39, 55).
Aa
White text reads best on this color (6.53:1).
About this color
#B12737 is a medium-dark, vivid red. In OKLCH its lightness is 50%, its chroma 0.173 and its hue 20°. Its hue sits on the warm side of the wheel. The nearest named color is Firebrick (#B22222), ΔE 0.021 away. White text reads best on it, at 6.53:1.
| Hue family | Reds |
| Lightness | medium-dark (50%) |
| Chroma | vivid (0.173) |
| Temperature | warm |
| Nearest name | Firebrick (#B22222) |
| Black text | 3.21:1 |
| White text | 6.53:1 |
Values
| HEX | #B12737 |
| RGB | rgb(177, 39, 55) |
| HSL | hsl(353, 64%, 42%) |
| OKLCH | oklch(50.2% 0.173 20.4) |
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 #B12737 | 6.53:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #B12737 | 3.21:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #B12737 text on white | 6.53:1 | AA | Lc 80.9 | Fine for body text |
| #B12737 text on black | 3.21:1 | AA large text | Lc -20.9 | 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
#FAE4E3
oklch(93.6% 0.024 20.7)
-
Step 200
200
#F7CECC
oklch(88.6% 0.047 21.4)
-
Step 300
300
#F2ABAA
oklch(80.8% 0.084 20)
-
Step 400
400
#E87C7D
oklch(70.7% 0.134 20.4)
-
Step 500
500
#DE555C
oklch(63.2% 0.171 20.5)
-
Step 600
600
#C93242
oklch(55.5% 0.187 20.3)
-
Step 700
700 (this color)
#B12737
oklch(50.2% 0.173 20.4)
-
Step 800
800
#8D202C
oklch(42.8% 0.144 20.1)
-
Step 900
900
#712227
oklch(37.7% 0.111 20.7)
-
Step 950
950
#431517
oklch(27% 0.071 20.7)
#B12737 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) | #504B36 | 0.191 |
| Deuteranopia (no green cones) | #736833 | 0.173 |
| Tritanopia (no blue cones) | #C3002E | 0.038 |
| Achromatopsia (no color) | #5E5E5E | 0.174 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B12737
#B12737
oklch(50.2% 0.173 20.4)
- #007277
#007277
oklch(50.2% 0.085 200.1)
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 #B12737, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Firebrick #B22222 ΔE 0.021
- Brown #A52A2A ΔE 0.029
- Rouge #AB1239 ΔE 0.030
- Lipstick Red #C0022F ΔE 0.033
- Rufous #AE2012 ΔE 0.034
- Rose Red #BE013C ΔE 0.034
- Scarlet #BE0119 ΔE 0.037
- Rusty Red #AF2F0D ΔE 0.042
Use #B12737 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.