#B4372F
Closest named color: Dull Red (#BB3F3F). oklch(52.1% 0.163 27.8), rgb(180, 55, 47).
Aa
White text reads best on this color (5.95:1).
About this color
#B4372F is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.163 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.026 away. White text reads best on it, at 5.95:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.163) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.52:1 |
| White text | 5.95:1 |
Values
| HEX | #B4372F |
| RGB | rgb(180, 55, 47) |
| HSL | hsl(4, 59%, 45%) |
| OKLCH | oklch(52.1% 0.163 27.8) |
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 #B4372F | 5.95:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #B4372F | 3.52:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #B4372F text on white | 5.95:1 | AA | Lc 78.7 | Fine for body text |
| #B4372F text on black | 3.52:1 | AA large text | Lc -23.1 | 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
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F9E5E1
oklch(93.7% 0.023 31.1)
-
Step 200
200
#F5CFC9
oklch(88.5% 0.044 28.5)
-
Step 300
300
#EFAEA5
oklch(80.9% 0.078 27.8)
-
Step 400
400
#E48074
oklch(70.7% 0.126 27.9)
-
Step 500
500
#DA5B50
oklch(63.1% 0.162 27.6)
-
Step 600
600
#C53C34
oklch(55.6% 0.175 27.6)
-
Step 700
700 (this color)
#B4372F
oklch(52.1% 0.163 27.8)
-
Step 800
800
#8A2721
oklch(42.7% 0.135 27.8)
-
Step 900
900
#6F2620
oklch(37.7% 0.105 27.8)
-
Step 950
950
#411713
oklch(26.9% 0.066 27.8)
#B4372F 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) | #5B522D | 0.172 |
| Deuteranopia (no green cones) | #7A6E2B | 0.159 |
| Tritanopia (no blue cones) | #C60D36 | 0.051 |
| Achromatopsia (no color) | #646464 | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B4372F
#B4372F
oklch(52.1% 0.163 27.8)
- #007784
#007784
oklch(52.1% 0.09 208.1)
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 #B4372F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.026
- Rusty Red #AF2F0D ΔE 0.029
- Firebrick #B22222 ΔE 0.030
- Sinopia #BB3E03 ΔE 0.038
- Rufous #AE2012 ΔE 0.039
- Brown #A52A2A ΔE 0.041
- Rust Red #AA2704 ΔE 0.042
- Brick #A03623 ΔE 0.043
Use #B4372F 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.