#66571D
Closest named color: Olive Brown (#645403). oklch(46% 0.078 94.5), rgb(102, 87, 29).
Aa
White text reads best on this color (7.12:1).
About this color
#66571D is a medium-dark, moderately saturated brown. In OKLCH its lightness is 46%, its chroma 0.078 and its hue 94°. Its hue sits on the warm side of the wheel. The nearest named color is Olive Brown (#645403), ΔE 0.017 away. White text reads best on it, at 7.12:1.
| Hue family | Browns |
| Lightness | medium-dark (46%) |
| Chroma | moderately saturated (0.078) |
| Temperature | warm |
| Nearest name | Olive Brown (#645403) |
| Black text | 2.94:1 |
| White text | 7.12:1 |
Values
| HEX | #66571D |
| RGB | rgb(102, 87, 29) |
| HSL | hsl(48, 56%, 26%) |
| OKLCH | oklch(46% 0.078 94.5) |
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 #66571D | 7.12:1 | AAA | Lc -89.6 | Fine for body text |
| Black text on #66571D | 2.94:1 | Fails | Lc 19.4 | Dividers and decoration only |
| #66571D text on white | 7.12:1 | AAA | Lc 84.6 | Fine for body text |
| #66571D text on black | 2.94:1 | Fails | Lc -17.3 | 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
#F6F5F2
oklch(97% 0.004 91.4)
-
Step 100
100
#ECEAE2
oklch(93.6% 0.011 95.2)
-
Step 200
200
#DDD9CA
oklch(88.4% 0.021 94.5)
-
Step 300
300
#C8C1A6
oklch(80.9% 0.038 95.1)
-
Step 400
400
#ADA175
oklch(70.8% 0.062 94.7)
-
Step 500
500
#988951
oklch(63.1% 0.078 94.9)
-
Step 600
600
#837334
oklch(55.7% 0.085 95.2)
-
Step 700
700 (this color)
#66571D
oklch(46% 0.078 94.5)
-
Step 800
800
#5A4E22
oklch(42.6% 0.064 94.3)
-
Step 900
900
#4A4121
oklch(37.6% 0.05 94.1)
-
Step 950
950
#2B2614
oklch(26.9% 0.031 94.4)
#66571D 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) | #605516 | 0.014 |
| Deuteranopia (no green cones) | #645A20 | 0.009 |
| Tritanopia (no blue cones) | #6E504B | 0.072 |
| Achromatopsia (no color) | #585858 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66571D
#66571D
oklch(46% 0.078 94.5)
- #4B5484
#4B5484
oklch(46% 0.079 274.8)
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 #66571D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Olive Brown #645403 ΔE 0.017
- Mud #735C12 ΔE 0.029
- Greeny Brown #696006 ΔE 0.034
- Medium Brown #7F5112 ΔE 0.045
- Green Brown #544E03 ΔE 0.046
- Army Green #4B5D16 ΔE 0.048
- Camo Green #526525 ΔE 0.048
- Milk Chocolate #7F4E1E ΔE 0.051
Use #66571D 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.