#B0371B
Closest named color: Rusty Red (#AF2F0D). oklch(51.2% 0.162 34.2), rgb(176, 55, 27).
Aa
White text reads best on this color (6.16:1).
About this color
#B0371B is a medium-dark, vivid red. In OKLCH its lightness is 51%, its chroma 0.162 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.014 away. White text reads best on it, at 6.16:1.
| Hue family | Reds |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.162) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.40:1 |
| White text | 6.16:1 |
Values
| HEX | #B0371B |
| RGB | rgb(176, 55, 27) |
| HSL | hsl(11, 73%, 40%) |
| OKLCH | oklch(51.2% 0.162 34.2) |
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 #B0371B | 6.16:1 | AA | Lc -84.8 | Fine for body text |
| Black text on #B0371B | 3.40:1 | AA large text | Lc 24.4 | Dividers and decoration only |
| #B0371B text on white | 6.16:1 | AA | Lc 79.6 | Fine for body text |
| #B0371B text on black | 3.40:1 | AA large text | Lc -22.2 | 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
#F9E5E0
oklch(93.7% 0.023 34.3)
-
Step 200
200
#F4D0C6
oklch(88.5% 0.043 36)
-
Step 300
300
#EFAF9F
oklch(81% 0.079 34.5)
-
Step 400
400
#E3826B
oklch(70.7% 0.125 34.3)
-
Step 500
500
#D85E42
oklch(63% 0.16 34.3)
-
Step 600
600
#C43F21
oklch(55.6% 0.175 34)
-
Step 700
700 (this color)
#B0371B
oklch(51.2% 0.162 34.2)
-
Step 800
800
#892913
oklch(42.6% 0.135 34.1)
-
Step 900
900
#6E2718
oklch(37.6% 0.105 33.6)
-
Step 950
950
#41180F
oklch(27% 0.066 33.9)
#B0371B 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) | #5B5016 | 0.167 |
| Deuteranopia (no green cones) | #796B14 | 0.152 |
| Tritanopia (no blue cones) | #C20A32 | 0.061 |
| Achromatopsia (no color) | #616161 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B0371B
#B0371B
oklch(51.2% 0.162 34.2)
- #007386
#007386
oklch(51.1% 0.09 214.4)
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 #B0371B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.014
- Rust Red #AA2704 ΔE 0.030
- Sinopia #BB3E03 ΔE 0.031
- Firebrick #B22222 ΔE 0.032
- Rufous #AE2012 ΔE 0.033
- Russet #A13905 ΔE 0.033
- Brick #A03623 ΔE 0.033
- Brown #A52A2A ΔE 0.040
Use #B0371B 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.