#A1551B
Closest named color: Sienna (#A0522D). oklch(53.1% 0.121 53), rgb(161, 85, 27).
Aa
White text reads best on this color (5.48:1).
About this color
#A1551B is a medium-dark, moderately saturated brown. In OKLCH its lightness is 53%, its chroma 0.121 and its hue 53°. Its hue sits on the warm side of the wheel. The nearest named color is Sienna (#A0522D), ΔE 0.019 away. White text reads best on it, at 5.48:1.
| Hue family | Browns |
| Lightness | medium-dark (53%) |
| Chroma | moderately saturated (0.121) |
| Temperature | warm |
| Nearest name | Sienna (#A0522D) |
| Black text | 3.83:1 |
| White text | 5.48:1 |
Values
| HEX | #A1551B |
| RGB | rgb(161, 85, 27) |
| HSL | hsl(26, 71%, 37%) |
| OKLCH | oklch(53.1% 0.121 53) |
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 #A1551B | 5.48:1 | AA | Lc -82.2 | Fine for body text |
| Black text on #A1551B | 3.83:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #A1551B text on white | 5.48:1 | AA | Lc 76.9 | Fine for body text |
| #A1551B text on black | 3.83:1 | AA large text | Lc -24.8 | 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
#FAF4F1
oklch(97.1% 0.008 48.7)
-
Step 100
100
#F3E7E0
oklch(93.6% 0.016 52.6)
-
Step 200
200
#EAD4C7
oklch(88.4% 0.03 52.7)
-
Step 300
300
#DEB8A0
oklch(81% 0.055 54)
-
Step 400
400
#CC926D
oklch(70.8% 0.087 53.4)
-
Step 500
500
#BE7545
oklch(63.1% 0.112 52.7)
-
Step 600
600 (this color)
#A1551B
oklch(53.1% 0.121 53)
-
Step 700
700
#914C16
oklch(49.2% 0.113 53.4)
-
Step 800
800
#763E16
oklch(42.7% 0.094 52.3)
-
Step 900
900
#5F3619
oklch(37.8% 0.072 53.8)
-
Step 950
950
#382010
oklch(27.1% 0.046 53.3)
#A1551B 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) | #6B5F11 | 0.101 |
| Deuteranopia (no green cones) | #7D701A | 0.092 |
| Tritanopia (no blue cones) | #B1444A | 0.078 |
| Achromatopsia (no color) | #696969 | 0.122 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A1551B
#A1551B
oklch(53.1% 0.121 53)
- #0076A1
#0076A1
oklch(53.2% 0.11 232.8)
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 #A1551B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Sienna #A0522D ΔE 0.019
- Cinnamon #AC4F06 ΔE 0.022
- Sepia #985E2B ΔE 0.025
- Raw Umber #A75E09 ΔE 0.029
- Warm Brown #964E02 ΔE 0.030
- Burnt Umber #A0450E ΔE 0.036
- Raw Sienna #9A6200 ΔE 0.039
- Burnt Siena #B75203 ΔE 0.041
Use #A1551B 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.