#B73909
Closest named color: Sinopia (#BB3E03). oklch(52.5% 0.17 37.3), rgb(183, 57, 9).
Aa
White text reads best on this color (5.82:1).
About this color
#B73909 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.170 and its hue 37°. Its hue sits on the warm side of the wheel. The nearest named color is Sinopia (#BB3E03), ΔE 0.014 away. White text reads best on it, at 5.82:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.170) |
| Temperature | warm |
| Nearest name | Sinopia (#BB3E03) |
| Black text | 3.60:1 |
| White text | 5.82:1 |
Values
| HEX | #B73909 |
| RGB | rgb(183, 57, 9) |
| HSL | hsl(17, 91%, 38%) |
| OKLCH | oklch(52.5% 0.17 37.3) |
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 #B73909 | 5.82:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #B73909 | 3.60:1 | AA large text | Lc 26.1 | Dividers and decoration only |
| #B73909 text on white | 5.82:1 | AA | Lc 78.0 | Fine for body text |
| #B73909 text on black | 3.60:1 | AA large text | Lc -23.8 | 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
#F8E5E0
oklch(93.6% 0.022 35.1)
-
Step 200
200
#F3D0C6
oklch(88.4% 0.042 36.5)
-
Step 300
300
#EDB09E
oklch(80.9% 0.076 37.1)
-
Step 400
400
#E18468
oklch(70.7% 0.122 37.5)
-
Step 500
500
#D6613E
oklch(63.1% 0.156 37.3)
-
Step 600
600 (this color)
#B73909
oklch(52.5% 0.17 37.3)
-
Step 700
700
#A73409
oklch(49.2% 0.158 37.3)
-
Step 800
800
#872C0E
oklch(42.6% 0.131 37.1)
-
Step 900
900
#6D2915
oklch(37.7% 0.102 36.9)
-
Step 950
950
#40190D
oklch(27% 0.065 37.7)
#B73909 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) | #5F5300 | 0.173 |
| Deuteranopia (no green cones) | #7E6F00 | 0.155 |
| Tritanopia (no blue cones) | #CA0432 | 0.070 |
| Achromatopsia (no color) | #656565 | 0.171 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B73909
#B73909
oklch(52.5% 0.17 37.3)
- #00778E
#00778E
oklch(52.5% 0.094 217.5)
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 #B73909, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sinopia #BB3E03 ΔE 0.014
- Rusty Red #AF2F0D ΔE 0.026
- Brick Orange #C14A09 ΔE 0.040
- Rust Red #AA2704 ΔE 0.043
- Dull Red #BB3F3F ΔE 0.043
- Firebrick #B22222 ΔE 0.044
- Cinnamon #AC4F06 ΔE 0.045
- Russet #A13905 ΔE 0.045
Use #B73909 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.