#B43909
Closest named color: Sinopia (#BB3E03). oklch(52% 0.167 37.6), rgb(180, 57, 9).
Aa
White text reads best on this color (5.94:1).
About this color
#B43909 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.167 and its hue 38°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.018 away. White text reads best on it, at 5.94:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.52:1 |
| White text | 5.94:1 |
Values
| HEX | #B43909 |
| RGB | rgb(180, 57, 9) |
| HSL | hsl(17, 90%, 37%) |
| OKLCH | oklch(52% 0.167 37.6) |
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 #B43909 | 5.94:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #B43909 | 3.52:1 | AA large text | Lc 25.5 | Dividers and decoration only |
| #B43909 text on white | 5.94:1 | AA | Lc 78.6 | Fine for body text |
| #B43909 text on black | 3.52:1 | AA large text | Lc -23.2 | 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
#FCF3F0
oklch(97% 0.011 39.4)
-
Step 100
100
#F9E5DF
oklch(93.6% 0.023 37.4)
-
Step 200
200
#F5D0C4
oklch(88.6% 0.045 38.8)
-
Step 300
300
#EFAF9B
oklch(80.9% 0.081 38.1)
-
Step 400
400
#E48264
oklch(70.7% 0.129 37.8)
-
Step 500
500
#DA5E37
oklch(63.2% 0.165 37.7)
-
Step 600
600
#C53F09
oklch(55.6% 0.179 37.7)
-
Step 700
700 (this color)
#B43909
oklch(52% 0.167 37.6)
-
Step 800
800
#8A2903
oklch(42.7% 0.138 37.8)
-
Step 900
900
#6F2710
oklch(37.7% 0.108 37.5)
-
Step 950
950
#41180B
oklch(26.9% 0.068 38)
#B43909 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) | #5E5200 | 0.169 |
| Deuteranopia (no green cones) | #7C6E00 | 0.153 |
| Tritanopia (no blue cones) | #C70931 | 0.069 |
| Achromatopsia (no color) | #646464 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B43909
#B43909
oklch(52% 0.167 37.6)
- #00758C
#00758C
oklch(51.9% 0.093 217.8)
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 #B43909, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.018
- Rusty Red #AF2F0D ΔE 0.022
- Rust Red #AA2704 ΔE 0.038
- Russet #A13905 ΔE 0.039
- Burnt Umber #A0450E ΔE 0.041
- Firebrick #B22222 ΔE 0.042
- Rufous #AE2012 ΔE 0.042
- Cinnamon #AC4F06 ΔE 0.044
Use #B43909 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.