#BB431B
Closest named color: Sinopia (#BB3E03). oklch(54.5% 0.163 37.5), rgb(187, 67, 27).
Aa
White text reads best on this color (5.34:1).
About this color
#BB431B is a medium-dark, vivid red. In OKLCH its lightness is 54%, its chroma 0.163 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.011 away. White text reads best on it, at 5.34:1.
| Hue family | Reds |
| Lightness | medium-dark (54%) |
| Chroma | vivid (0.163) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.93:1 |
| White text | 5.34:1 |
Values
| HEX | #BB431B |
| RGB | rgb(187, 67, 27) |
| HSL | hsl(15, 75%, 42%) |
| OKLCH | oklch(54.5% 0.163 37.5) |
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 #BB431B | 5.34:1 | AA | Lc -81.0 | Fine for body text |
| Black text on #BB431B | 3.93:1 | AA large text | Lc 28.5 | Dividers and decoration only |
| #BB431B text on white | 5.34:1 | AA | Lc 75.6 | Fine for body text |
| #BB431B text on black | 3.93:1 | AA large text | Lc -26.1 | 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 600.
-
Step 50
50
#FCF3F1
oklch(97.1% 0.01 32.5)
-
Step 100
100
#F7E5E0
oklch(93.5% 0.021 36)
-
Step 200
200
#F2D1C6
oklch(88.5% 0.04 39.3)
-
Step 300
300
#EBB19F
oklch(80.9% 0.073 37.9)
-
Step 400
400
#DF856A
oklch(70.7% 0.118 37.5)
-
Step 500
500
#D36341
oklch(63% 0.15 37.5)
-
Step 600
600 (this color)
#BB431B
oklch(54.5% 0.163 37.5)
-
Step 700
700
#A43711
oklch(49.1% 0.151 37.5)
-
Step 800
800
#852F12
oklch(42.7% 0.125 37.8)
-
Step 900
900
#6B2B17
oklch(37.7% 0.097 37.7)
-
Step 950
950
#3F1A0F
oklch(27% 0.061 37.3)
#BB431B 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) | #665A14 | 0.164 |
| Deuteranopia (no green cones) | #837514 | 0.150 |
| Tritanopia (no blue cones) | #CE213C | 0.069 |
| Achromatopsia (no color) | #6B6B6B | 0.164 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #BB431B
#BB431B
oklch(54.5% 0.163 37.5)
- #007D95
#007D95
oklch(54.4% 0.097 217.5)
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 #BB431B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.011
- Brick Orange #C14A09 ΔE 0.022
- Burnt Orange #C04E01 ΔE 0.030
- Burnt Siena #B75203 ΔE 0.035
- Dull Red #BB3F3F ΔE 0.038
- Cinnamon #AC4F06 ΔE 0.039
- Rust Orange #C45508 ΔE 0.045
- Rusty Red #AF2F0D ΔE 0.045
Use #BB431B 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.