#66573F
Closest named color: Milk Chocolate (#7F4E1E). oklch(46.5% 0.041 79.2), rgb(102, 87, 63).
Aa
White text reads best on this color (6.99:1).
About this color
#66573F is a medium-dark, muted brown. In OKLCH its lightness is 47%, its chroma 0.041 and its hue 79°. Its hue sits on the warm side of the wheel. The nearest named color is Milk Chocolate (#7F4E1E), ΔE 0.053 away. White text reads best on it, at 6.99:1.
| Hue family | Browns |
| Lightness | medium-dark (47%) |
| Chroma | muted (0.041) |
| Temperature | warm |
| Nearest name | Milk Chocolate (#7F4E1E) |
| Black text | 3.00:1 |
| White text | 6.99:1 |
Values
| HEX | #66573F |
| RGB | rgb(102, 87, 63) |
| HSL | hsl(37, 24%, 32%) |
| OKLCH | oklch(46.5% 0.041 79.2) |
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 #66573F | 6.99:1 | AA | Lc -89.2 | Fine for body text |
| Black text on #66573F | 3.00:1 | AA large text | Lc 19.8 | Dividers and decoration only |
| #66573F text on white | 6.99:1 | AA | Lc 84.2 | Fine for body text |
| #66573F text on black | 3.00:1 | AA large text | Lc -17.7 | 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
#F6F5F3
oklch(97% 0.003 84.6)
-
Step 100
100
#ECE9E6
oklch(93.6% 0.005 67.8)
-
Step 200
200
#DDD8D1
oklch(88.4% 0.011 76.6)
-
Step 300
300
#C8BFB3
oklch(80.9% 0.019 75.3)
-
Step 400
400
#AB9F8B
oklch(70.7% 0.032 80.6)
-
Step 500
500
#97876E
oklch(63.1% 0.041 78.9)
-
Step 600
600
#817156
oklch(55.6% 0.044 80.6)
-
Step 700
700 (this color)
#66573F
oklch(46.5% 0.041 79.2)
-
Step 800
800
#594D3A
oklch(42.7% 0.034 79)
-
Step 900
900
#494032
oklch(37.6% 0.026 78.7)
-
Step 950
950
#2B261D
oklch(27.1% 0.018 82.2)
#66573F 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) | #5D573D | 0.016 |
| Deuteranopia (no green cones) | #615B40 | 0.014 |
| Tritanopia (no blue cones) | #6C5351 | 0.036 |
| Achromatopsia (no color) | #595959 | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66573F
#66573F
oklch(46.5% 0.041 79.2)
- #4C5A71
#4C5A71
oklch(46.5% 0.041 260.3)
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 #66573F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Milk Chocolate #7F4E1E ΔE 0.053
- Olive Brown #645403 ΔE 0.055
- Mud #735C12 ΔE 0.055
- Medium Brown #7F5112 ΔE 0.057
- Mud Brown #60460F ΔE 0.064
- Cocoa #875F42 ΔE 0.065
- Greeny Brown #696006 ΔE 0.066
- Dark Moss Green #606C38 ΔE 0.068
Use #66573F 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.