#66543D
Closest named color: Milk Chocolate (#7F4E1E). oklch(45.8% 0.042 73.3), rgb(102, 84, 61).
Aa
White text reads best on this color (7.24:1).
About this color
#66543D is a medium-dark, muted brown. In OKLCH its lightness is 46%, its chroma 0.042 and its hue 73°. Its hue sits on the warm side of the wheel. The nearest named color is Milk Chocolate (#7F4E1E), ΔE 0.052 away. White text reads best on it, at 7.24:1.
| Hue family | Browns |
| Lightness | medium-dark (46%) |
| Chroma | muted (0.042) |
| Temperature | warm |
| Nearest name | Milk Chocolate (#7F4E1E) |
| Black text | 2.90:1 |
| White text | 7.24:1 |
Values
| HEX | #66543D |
| RGB | rgb(102, 84, 61) |
| HSL | hsl(34, 25%, 32%) |
| OKLCH | oklch(45.8% 0.042 73.3) |
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 #66543D | 7.24:1 | AAA | Lc -90.0 | Preferred for body text |
| Black text on #66543D | 2.90:1 | Fails | Lc 18.9 | Dividers and decoration only |
| #66543D text on white | 7.24:1 | AAA | Lc 85.1 | Fine for body text |
| #66543D text on black | 2.90:1 | Fails | Lc -16.9 | 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 800.
-
Step 50
50
#F7F5F3
oklch(97.1% 0.003 67.8)
-
Step 100
100
#EDE9E5
oklch(93.6% 0.007 67.7)
-
Step 200
200
#DFD8CF
oklch(88.5% 0.014 74.4)
-
Step 300
300
#CBBFB0
oklch(81% 0.025 73.6)
-
Step 400
400
#B09D86
oklch(70.6% 0.039 72.4)
-
Step 500
500
#9C8568
oklch(63% 0.05 73.2)
-
Step 600
600
#876F4F
oklch(55.7% 0.055 74.3)
-
Step 700
700
#735C40
oklch(49.1% 0.051 71.7)
-
Step 800
800 (this color)
#66543D
oklch(45.8% 0.042 73.3)
-
Step 900
900
#4C3F2E
oklch(37.6% 0.033 74)
-
Step 950
950
#2D251B
oklch(27% 0.021 72.9)
#66543D 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) | #5B543B | 0.019 |
| Deuteranopia (no green cones) | #5F593E | 0.018 |
| Tritanopia (no blue cones) | #6D4F4E | 0.037 |
| Achromatopsia (no color) | #575757 | 0.042 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66543D
#66543D
oklch(45.8% 0.042 73.3)
- #47596F
#47596F
oklch(45.8% 0.042 253.7)
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 #66543D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Milk Chocolate #7F4E1E ΔE 0.052
- Olive Brown #645403 ΔE 0.055
- Medium Brown #7F5112 ΔE 0.057
- Mud Brown #60460F ΔE 0.058
- Mud #735C12 ΔE 0.059
- Green Brown #544E03 ΔE 0.069
- Cocoa #875F42 ΔE 0.069
- Greeny Brown #696006 ΔE 0.070
Use #66543D 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.