#B3372F
Closest named color: Dull Red (#BB3F3F). oklch(51.9% 0.162 27.8), rgb(179, 55, 47).
Aa
White text reads best on this color (5.99:1).
About this color
#B3372F is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.162 and its hue 28°. Its hue sits on the warm side of the wheel. The nearest named color is Dull Red (#BB3F3F), ΔE 0.027 away. White text reads best on it, at 5.99:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.162) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.50:1 |
| White text | 5.99:1 |
Values
| HEX | #B3372F |
| RGB | rgb(179, 55, 47) |
| HSL | hsl(4, 58%, 44%) |
| OKLCH | oklch(51.9% 0.162 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 #B3372F | 5.99:1 | AA | Lc -84.1 | Fine for body text |
| Black text on #B3372F | 3.50:1 | AA large text | Lc 25.2 | Dividers and decoration only |
| #B3372F text on white | 5.99:1 | AA | Lc 78.9 | Fine for body text |
| #B3372F text on black | 3.50:1 | AA large text | Lc -22.9 | 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
#FCF3F2
oklch(97.1% 0.01 25.1)
-
Step 100
100
#F9E5E2
oklch(93.7% 0.022 27.8)
-
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
#D95C50
oklch(63.1% 0.16 28)
-
Step 600
600
#C43D34
oklch(55.5% 0.173 27.9)
-
Step 700
700 (this color)
#B3372F
oklch(51.9% 0.162 27.8)
-
Step 800
800
#892821
oklch(42.7% 0.133 28.2)
-
Step 900
900
#6F2620
oklch(37.7% 0.105 27.8)
-
Step 950
950
#411713
oklch(26.9% 0.066 27.8)
#B3372F 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) | #5A522D | 0.172 |
| Deuteranopia (no green cones) | #796D2B | 0.158 |
| Tritanopia (no blue cones) | #C50E36 | 0.051 |
| Achromatopsia (no color) | #636363 | 0.163 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B3372F
#B3372F
oklch(51.9% 0.162 27.8)
- #007783
#007783
oklch(52% 0.089 207.1)
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 #B3372F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dull Red #BB3F3F ΔE 0.027
- Rusty Red #AF2F0D ΔE 0.028
- Firebrick #B22222 ΔE 0.029
- Rufous #AE2012 ΔE 0.038
- Sinopia #BB3E03 ΔE 0.039
- Brown #A52A2A ΔE 0.039
- Rust Red #AA2704 ΔE 0.041
- Brick #A03623 ΔE 0.041
Use #B3372F 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.