#B73728
Closest named color: Dull Red (#BB3F3F). oklch(52.5% 0.167 30.2), rgb(183, 55, 40).
Aa
White text reads best on this color (5.84:1).
About this color
#B73728 is a medium-dark, vivid red. In OKLCH its lightness is 53%, its chroma 0.167 and its hue 30°. 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 5.84:1.
| Hue family | Reds |
| Lightness | medium-dark (53%) |
| Chroma | vivid (0.167) |
| Temperature | warm |
| Nearest name | Dull Red (#BB3F3F) |
| Black text | 3.59:1 |
| White text | 5.84:1 |
Values
| HEX | #B73728 |
| RGB | rgb(183, 55, 40) |
| HSL | hsl(6, 64%, 44%) |
| OKLCH | oklch(52.5% 0.167 30.2) |
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 #B73728 | 5.84:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #B73728 | 3.59:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #B73728 text on white | 5.84:1 | AA | Lc 78.1 | Fine for body text |
| #B73728 text on black | 3.59:1 | AA large text | Lc -23.7 | 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
#F8E5E1
oklch(93.6% 0.022 31.8)
-
Step 200
200
#F4D0C9
oklch(88.6% 0.042 30.9)
-
Step 300
300
#EDAFA4
oklch(80.9% 0.075 30.1)
-
Step 400
400
#E18273
oklch(70.6% 0.12 29.9)
-
Step 500
500
#D65F4E
oklch(63% 0.154 30.2)
-
Step 600
600 (this color)
#B73728
oklch(52.5% 0.167 30.2)
-
Step 700
700
#A73224
oklch(49.2% 0.155 30.3)
-
Step 800
800
#872B1F
oklch(42.6% 0.128 30.5)
-
Step 900
900
#6D281F
oklch(37.7% 0.1 29.9)
-
Step 950
950
#401813
oklch(26.9% 0.064 29.2)
#B73728 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) | #5C5325 | 0.177 |
| Deuteranopia (no green cones) | #7C6F23 | 0.161 |
| Tritanopia (no blue cones) | #CA0535 | 0.057 |
| Achromatopsia (no color) | #656565 | 0.168 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B73728
#B73728
oklch(52.5% 0.167 30.2)
- #007887
#007887
oklch(52.5% 0.091 209.9)
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 #B73728, 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
- Sinopia #BB3E03 ΔE 0.029
- Firebrick #B22222 ΔE 0.033
- Rufous #AE2012 ΔE 0.041
- Rust Red #AA2704 ΔE 0.043
- Scarlet #BE0119 ΔE 0.045
- Dusty Red #B9484E ΔE 0.045
Use #B73728 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.