#A66537
Closest named color: Earth (#A2653E). oklch(57% 0.104 54.2), rgb(166, 101, 55).
Aa
White text reads best on this color (4.62:1).
About this color
#A66537 is a medium-dark, moderately saturated brown. In OKLCH its lightness is 57%, its chroma 0.104 and its hue 54°. Its hue sits on the warm side of the wheel. The nearest named color is Earth (#A2653E), ΔE 0.010 away. White text reads best on it, at 4.62:1.
| Hue family | Browns |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.104) |
| Temperature | warm |
| Nearest name | Earth (#A2653E) |
| Black text | 4.53:1 |
| White text | 4.62:1 |
Values
| HEX | #A66537 |
| RGB | rgb(166, 101, 55) |
| HSL | hsl(25, 50%, 43%) |
| OKLCH | oklch(57% 0.104 54.2) |
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 #A66537 | 4.62:1 | AA | Lc -77.3 | Fine for body text |
| Black text on #A66537 | 4.53:1 | AA | Lc 32.2 | Non-text elements, placeholder text |
| #A66537 text on white | 4.62:1 | AA | Lc 71.9 | Content text, not long reading |
| #A66537 text on black | 4.53:1 | AA | Lc -29.8 | 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
#F9F4F2
oklch(97% 0.006 43.3)
-
Step 100
100
#F1E8E2
oklch(93.6% 0.013 56.2)
-
Step 200
200
#E8D5C9
oklch(88.5% 0.027 54.5)
-
Step 300
300
#DAB9A5
oklch(80.9% 0.047 53)
-
Step 400
400
#C69474
oklch(70.7% 0.075 53.8)
-
Step 500
500
#B67950
oklch(63% 0.095 54)
-
Step 600
600 (this color)
#A66537
oklch(57% 0.104 54.2)
-
Step 700
700
#8A5025
oklch(49.1% 0.096 54.6)
-
Step 800
800
#704220
oklch(42.7% 0.08 55)
-
Step 900
900
#5B3820
oklch(37.7% 0.062 54.1)
-
Step 950
950
#352113
oklch(26.9% 0.039 55.2)
#A66537 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) | #786C32 | 0.082 |
| Deuteranopia (no green cones) | #877A37 | 0.074 |
| Tritanopia (no blue cones) | #B5585A | 0.068 |
| Achromatopsia (no color) | #757575 | 0.104 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A66537
#A66537
oklch(57% 0.104 54.2)
- #2980AB
#2980AB
oklch(56.9% 0.104 234.7)
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 #A66537, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Earth #A2653E ΔE 0.010
- Raw Umber #A75E09 ΔE 0.030
- Copper #B66325 ΔE 0.030
- Orangey Brown #B16002 ΔE 0.033
- Sepia #985E2B ΔE 0.034
- Umber #B26400 ΔE 0.036
- Clay Brown #B2713D ΔE 0.039
- Leather #AC7434 ΔE 0.042
Use #A66537 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.