#666F4C
Closest named color: Dark Moss Green (#606C38). oklch(52.4% 0.053 120), rgb(102, 111, 76).
Aa
White text reads best on this color (5.32:1).
About this color
#666F4C is a medium-dark, muted yellow. In OKLCH its lightness is 52%, its chroma 0.053 and its hue 120°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Moss Green (#606C38), ΔE 0.028 away. White text reads best on it, at 5.32:1.
| Hue family | Yellows |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.053) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.94:1 |
| White text | 5.32:1 |
Values
| HEX | #666F4C |
| RGB | rgb(102, 111, 76) |
| HSL | hsl(75, 19%, 37%) |
| OKLCH | oklch(52.4% 0.053 120) |
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 #666F4C | 5.32:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #666F4C | 3.94:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #666F4C text on white | 5.32:1 | AA | Lc 76.5 | Fine for body text |
| #666F4C text on black | 3.94:1 | AA large text | Lc -25.2 | 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
#F5F6F3
oklch(97.2% 0.004 121.6)
-
Step 100
100
#E9EAE5
oklch(93.5% 0.007 115.7)
-
Step 200
200
#D8DAD1
oklch(88.4% 0.012 116.8)
-
Step 300
300
#BEC3B2
oklch(80.8% 0.024 120.3)
-
Step 400
400
#9DA48A
oklch(70.6% 0.038 119.6)
-
Step 500
500
#858E6D
oklch(63% 0.049 120.2)
-
Step 600
600 (this color)
#666F4C
oklch(52.4% 0.053 120)
-
Step 700
700
#5D6545
oklch(49.1% 0.049 119.7)
-
Step 800
800
#4C5239
oklch(42.6% 0.04 119.1)
-
Step 900
900
#3F4431
oklch(37.6% 0.032 119.9)
-
Step 950
950
#25281D
oklch(27% 0.02 120.1)
#666F4C 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) | #736B4A | 0.022 |
| Deuteranopia (no green cones) | #726B4E | 0.022 |
| Tritanopia (no blue cones) | #696B66 | 0.045 |
| Achromatopsia (no color) | #6B6B6B | 0.053 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666F4C
#666F4C
oklch(52.4% 0.053 120)
- #6F6385
#6F6385
oklch(52.4% 0.054 300.7)
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 #666F4C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.028
- Muddy Green #657432 ΔE 0.040
- Grey Brown #7F7053 ΔE 0.042
- Dark Taupe #7F684E ΔE 0.044
- Dark Olive Green #556B2F ΔE 0.047
- Military Green #667C3E ΔE 0.048
- Dirt Brown #836539 ΔE 0.050
- Dull Brown #876E4B ΔE 0.052
Use #666F4C 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.