#B73315
Closest named color: Rusty Red (#AF2F0D). oklch(52% 0.173 33.8), rgb(183, 51, 21).
Aa
White text reads best on this color (6.00:1).
About this color
#B73315 is a medium-dark, vivid red. In OKLCH its lightness is 52%, its chroma 0.173 and its hue 34°. Its hue sits on the warm side of the wheel. The nearest named color is Rusty Red (#AF2F0D), ΔE 0.019 away. White text reads best on it, at 6.00:1.
| Hue family | Reds |
| Lightness | medium-dark (52%) |
| Chroma | vivid (0.173) |
| Temperature | warm |
| Nearest name | Rusty Red (#AF2F0D) |
| Black text | 3.49:1 |
| White text | 6.00:1 |
Values
| HEX | #B73315 |
| RGB | rgb(183, 51, 21) |
| HSL | hsl(11, 79%, 40%) |
| OKLCH | oklch(52% 0.173 33.8) |
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 #B73315 | 6.00:1 | AA | Lc -84.0 | Fine for body text |
| Black text on #B73315 | 3.49:1 | AA large text | Lc 25.3 | Dividers and decoration only |
| #B73315 text on white | 6.00:1 | AA | Lc 78.7 | Fine for body text |
| #B73315 text on black | 3.49:1 | AA large text | Lc -23.1 | 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 700.
-
Step 50
50
#FDF3F1
oklch(97.1% 0.011 31.1)
-
Step 100
100
#FAE5DF
oklch(93.7% 0.025 36.5)
-
Step 200
200
#F6CFC5
oklch(88.5% 0.046 34.7)
-
Step 300
300
#F2AD9D
oklch(80.9% 0.085 33.5)
-
Step 400
400
#E87F67
oklch(70.8% 0.135 33.9)
-
Step 500
500
#DD593D
oklch(63% 0.171 33.6)
-
Step 600
600
#C93817
oklch(55.6% 0.187 33.7)
-
Step 700
700 (this color)
#B73315
oklch(52% 0.173 33.8)
-
Step 800
800
#8D240C
oklch(42.8% 0.144 33.7)
-
Step 900
900
#712414
oklch(37.7% 0.112 33.5)
-
Step 950
950
#43170D
oklch(27.2% 0.071 34.3)
#B73315 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) | #5B500E | 0.182 |
| Deuteranopia (no green cones) | #7C6E0A | 0.164 |
| Tritanopia (no blue cones) | #CA002E | 0.058 |
| Achromatopsia (no color) | #636363 | 0.175 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B73315
#B73315
oklch(52% 0.173 33.8)
- #007689
#007689
oklch(52% 0.091 214)
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 #B73315, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rusty Red #AF2F0D ΔE 0.019
- Sinopia #BB3E03 ΔE 0.025
- Firebrick #B22222 ΔE 0.032
- Rufous #AE2012 ΔE 0.035
- Rust Red #AA2704 ΔE 0.036
- Dull Red #BB3F3F ΔE 0.040
- Scarlet #BE0119 ΔE 0.043
- Russet #A13905 ΔE 0.045
Use #B73315 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.