#B4372A
Closest named color: Rusty Red (#AF2F0D). oklch(52% 0.164 29.6), rgb(180, 55, 42).
Aa
White text reads best on this color (5.96:1).
About this color
#B4372A is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.164 and its hue 30°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.025 away. White text reads best on it, at 5.96:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.164) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.52:1 |
| White text | 5.96:1 |
Values
| HEX | #B4372A |
| RGB | rgb(180, 55, 42) |
| HSL | hsl(6, 62%, 44%) |
| OKLCH | oklch(52% 0.164 29.6) |
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 #B4372A | 5.96:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #B4372A | 3.52:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #B4372A text on white | 5.96:1 | AA | Lc 78.7 | Fine for body text |
| #B4372A 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
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#F9E5E1
oklch(93.7% 0.023 31.1)
-
Step 200
200
#F5CFC8
oklch(88.5% 0.044 30.2)
-
Step 300
300
#EFAEA3
oklch(80.9% 0.078 29.7)
-
Step 400
400
#E58071
oklch(70.7% 0.127 29.5)
-
Step 500
500
#DA5C4C
oklch(63.2% 0.162 29.6)
-
Step 600
600
#C53C2E
oklch(55.5% 0.176 29.6)
-
Step 700
700 (this color)
#B4372A
oklch(52% 0.164 29.6)
-
Step 800
800
#8A271D
oklch(42.7% 0.136 29.5)
-
Step 900
900
#6F261D
oklch(37.7% 0.106 29.8)
-
Step 950
950
#411712
oklch(26.9% 0.067 29.1)
#B4372A 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) | #5B5227 | 0.173 |
| Deuteranopia (no green cones) | #7A6E25 | 0.159 |
| Tritanopia (no blue cones) | #C60B35 | 0.054 |
| Achromatopsia (no color) | #636363 | 0.165 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B4372A
#B4372A
oklch(52% 0.164 29.6)
- #007785
#007785
oklch(52.1% 0.09 209.1)
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 #B4372A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.025
- Dull Red #BB3F3F ΔE 0.029
- Firebrick #B22222 ΔE 0.030
- Sinopia #BB3E03 ΔE 0.033
- Rufous #AE2012 ΔE 0.037
- Rust Red #AA2704 ΔE 0.039
- Brown #A52A2A ΔE 0.042
- Brick #A03623 ΔE 0.042
Use #B4372A 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.