#B15137
Closest named color: Sienna (#A0522D). oklch(55.1% 0.132 36.1), rgb(177, 81, 55).
Aa
White text reads best on this color (5.12:1).
About this color
#B15137 is a medium-dark, moderately saturated red. In OKLCH its lightness is 55%, its chroma 0.132 and its hue 36°. Its hue sits on the warm side of the wheel. The nearest named color is Sienna (#A0522D), ΔE 0.035 away. White text reads best on it, at 5.12:1.
| Hue family | Reds |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.132) |
| Temperature | warm |
| Nearest name | Sienna (#A0522D) |
| Black text | 4.10:1 |
| White text | 5.12:1 |
Values
| HEX | #B15137 |
| RGB | rgb(177, 81, 55) |
| HSL | hsl(13, 53%, 45%) |
| OKLCH | oklch(55.1% 0.132 36.1) |
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 #B15137 | 5.12:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #B15137 | 4.10:1 | AA large text | Lc 29.3 | Dividers and decoration only |
| #B15137 text on white | 5.12:1 | AA | Lc 74.7 | Content text, not long reading |
| #B15137 text on black | 4.10:1 | AA large text | Lc -27.0 | 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
#FBF4F2
oklch(97.2% 0.008 36.6)
-
Step 100
100
#F5E6E2
oklch(93.6% 0.017 35.3)
-
Step 200
200
#EED2CA
oklch(88.5% 0.033 36.5)
-
Step 300
300
#E4B4A6
oklch(80.9% 0.06 36.9)
-
Step 400
400
#D48B77
oklch(70.6% 0.095 36)
-
Step 500
500
#C76C54
oklch(63% 0.121 35.7)
-
Step 600
600 (this color)
#B15137
oklch(55.1% 0.132 36.1)
-
Step 700
700
#99422B
oklch(49% 0.122 35.8)
-
Step 800
800
#7D3724
oklch(42.7% 0.102 36.1)
-
Step 900
900
#653022
oklch(37.7% 0.08 35.8)
-
Step 950
950
#3B1D15
oklch(27% 0.049 35.8)
#B15137 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) | #6B6134 | 0.130 |
| Deuteranopia (no green cones) | #827635 | 0.121 |
| Tritanopia (no blue cones) | #C23E4B | 0.057 |
| Achromatopsia (no color) | #6E6E6E | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #B15137
#B15137
oklch(55.1% 0.132 36.1)
- #008096
#008096
oklch(55.2% 0.098 215.3)
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 #B15137, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sienna #A0522D ΔE 0.035
- Cinnamon #AC4F06 ΔE 0.036
- Burnt Siena #B75203 ΔE 0.036
- Brick Orange #C14A09 ΔE 0.039
- Burnt Orange #C04E01 ΔE 0.040
- Dusty Red #B9484E ΔE 0.042
- Sinopia #BB3E03 ΔE 0.042
- Dull Red #BB3F3F ΔE 0.042
Use #B15137 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.