#A66740
Closest named color: Earth (#A2653E). oklch(57.4% 0.097 51.5), rgb(166, 103, 64).
Aa
Black text reads best on this color (4.63:1).
About this color
#A66740 is a medium-dark, moderately saturated brown. In OKLCH its lightness is 57%, its chroma 0.097 and its hue 51°. Its hue sits on the warm side of the wheel. The nearest named color is Earth (#A2653E), ΔE 0.009 away. Black text reads best on it, at 4.63:1.
| Hue family | Browns |
| Lightness | medium-dark (57%) |
| Chroma | moderately saturated (0.097) |
| Temperature | warm |
| Nearest name | Earth (#A2653E) |
| Black text | 4.63:1 |
| White text | 4.53:1 |
Values
| HEX | #A66740 |
| RGB | rgb(166, 103, 64) |
| HSL | hsl(23, 44%, 45%) |
| OKLCH | oklch(57.4% 0.097 51.5) |
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 #A66740 | 4.53:1 | AA | Lc -76.7 | Fine for body text |
| Black text on #A66740 | 4.63:1 | AA | Lc 32.9 | Non-text elements, placeholder text |
| #A66740 text on white | 4.53:1 | AA | Lc 71.2 | Content text, not long reading |
| #A66740 text on black | 4.63:1 | AA | Lc -30.4 | Non-text elements, placeholder text |
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
#E7D5CB
oklch(88.5% 0.024 51.1)
-
Step 300
300
#D9B9A7
oklch(80.9% 0.045 51.1)
-
Step 400
400
#C59579
oklch(70.8% 0.07 51.5)
-
Step 500
500
#B57A56
oklch(63.2% 0.089 51.9)
-
Step 600
600 (this color)
#A66740
oklch(57.4% 0.097 51.5)
-
Step 700
700
#89502D
oklch(49% 0.091 50.8)
-
Step 800
800
#6F4226
oklch(42.6% 0.075 51.4)
-
Step 900
900
#5A3824
oklch(37.6% 0.058 50.7)
-
Step 950
950
#352115
oklch(27% 0.037 51.5)
#A66740 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) | #796E3D | 0.079 |
| Deuteranopia (no green cones) | #887C40 | 0.073 |
| Tritanopia (no blue cones) | #B45B5E | 0.062 |
| Achromatopsia (no color) | #767676 | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #A66740
#A66740
oklch(57.4% 0.097 51.5)
- #2F82A8
#2F82A8
oklch(57.4% 0.098 232)
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 #A66740, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Earth #A2653E ΔE 0.009
- Copper #B66325 ΔE 0.034
- Clay Brown #B2713D ΔE 0.036
- Clay #B66A50 ΔE 0.036
- Mocha #9D7651 ΔE 0.038
- Raw Umber #A75E09 ΔE 0.039
- Sepia #985E2B ΔE 0.040
- Orangey Brown #B16002 ΔE 0.041
Use #A66740 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.