#B3431A
Closest named color: Sinopia (#BB3E03). oklch(53.2% 0.155 38.7), rgb(179, 67, 26).
Aa
White text reads best on this color (5.62:1).
About this color
#B3431A is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.155 and its hue 39°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.017 away. White text reads best on it, at 5.62:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.155) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #B3431A |
| RGB | rgb(179, 67, 26) |
| HSL | hsl(16, 75%, 40%) |
| OKLCH | oklch(53.2% 0.155 38.7) |
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 #B3431A | 5.62:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #B3431A | 3.73:1 | AA large text | Lc 26.8 | Dividers and decoration only |
| #B3431A text on white | 5.62:1 | AA | Lc 77.2 | Fine for body text |
| #B3431A text on black | 3.73:1 | AA large text | Lc -24.5 | 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 600.
-
Step 50
50
#FBF3F1
oklch(97% 0.009 34.3)
-
Step 100
100
#F7E6E0
oklch(93.7% 0.02 40.5)
-
Step 200
200
#F1D1C7
oklch(88.5% 0.039 38.1)
-
Step 300
300
#E9B2A0
oklch(80.9% 0.069 38.9)
-
Step 400
400
#DC876C
oklch(70.7% 0.112 38.4)
-
Step 500
500
#D06644
oklch(63% 0.143 38.3)
-
Step 600
600 (this color)
#B3431A
oklch(53.2% 0.155 38.7)
-
Step 700
700
#A13B15
oklch(49.1% 0.144 38.8)
-
Step 800
800
#833215
oklch(42.8% 0.119 38.9)
-
Step 900
900
#692D18
oklch(37.7% 0.092 39.3)
-
Step 950
950
#3E1B0F
oklch(27% 0.059 39.4)
#B3431A 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) | #635813 | 0.155 |
| Deuteranopia (no green cones) | #7F7114 | 0.140 |
| Tritanopia (no blue cones) | #C5253B | 0.068 |
| Achromatopsia (no color) | #676767 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B3431A
#B3431A
oklch(53.2% 0.155 38.7)
- #007992
#007992
oklch(53.2% 0.096 218.9)
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 #B3431A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.017
- Cinnamon #AC4F06 ΔE 0.031
- Brick Orange #C14A09 ΔE 0.034
- Rusty Red #AF2F0D ΔE 0.036
- Burnt Siena #B75203 ΔE 0.037
- Burnt Umber #A0450E ΔE 0.039
- Burnt Orange #C04E01 ΔE 0.039
- Dull Red #BB3F3F ΔE 0.042
Use #B3431A 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.