#666F4F
Closest named color: Dark Moss Green (#606C38). oklch(52.5% 0.049 120.9), rgb(102, 111, 79).
Aa
White text reads best on this color (5.31:1).
About this color
#666F4F is a medium-dark, muted yellow. In OKLCH its lightness is 53%, its chroma 0.049 and its hue 121°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Moss Green (#606C38), ΔE 0.032 away. White text reads best on it, at 5.31:1.
| Hue family | Yellows |
| Lightness | medium-dark (53%) |
| Chroma | muted (0.049) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.95:1 |
| White text | 5.31:1 |
Values
| HEX | #666F4F |
| RGB | rgb(102, 111, 79) |
| HSL | hsl(77, 17%, 37%) |
| OKLCH | oklch(52.5% 0.049 120.9) |
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 #666F4F | 5.31:1 | AA | Lc -81.8 | Fine for body text |
| Black text on #666F4F | 3.95:1 | AA large text | Lc 27.6 | Dividers and decoration only |
| #666F4F text on white | 5.31:1 | AA | Lc 76.4 | Fine for body text |
| #666F4F text on black | 3.95:1 | AA large text | Lc -25.3 | 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 600.
-
Step 50
50
#F5F6F3
oklch(97.2% 0.004 121.6)
-
Step 100
100
#E9EAE6
oklch(93.5% 0.005 117.9)
-
Step 200
200
#D8DAD2
oklch(88.5% 0.011 118)
-
Step 300
300
#BEC3B3
oklch(80.9% 0.023 121.1)
-
Step 400
400
#9DA48C
oklch(70.6% 0.035 120.5)
-
Step 500
500
#858E70
oklch(63.1% 0.045 121.2)
-
Step 600
600 (this color)
#666F4F
oklch(52.5% 0.049 120.9)
-
Step 700
700
#5D6548
oklch(49.2% 0.045 120.6)
-
Step 800
800
#4C523B
oklch(42.6% 0.037 119.9)
-
Step 900
900
#3F4433
oklch(37.7% 0.029 121.1)
-
Step 950
950
#25281E
oklch(27% 0.018 121.2)
#666F4F 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) | #736B4D | 0.022 |
| Deuteranopia (no green cones) | #726B50 | 0.022 |
| Tritanopia (no blue cones) | #696C67 | 0.041 |
| Achromatopsia (no color) | #6B6B6B | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666F4F
#666F4F
oklch(52.5% 0.049 120.9)
- #6F6483
#6F6483
oklch(52.5% 0.05 300.9)
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 #666F4F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.032
- Grey Brown #7F7053 ΔE 0.040
- Dark Taupe #7F684E ΔE 0.043
- Muddy Green #657432 ΔE 0.044
- Dim Gray #696969 ΔE 0.049
- Dark Olive Green #556B2F ΔE 0.051
- Dirt Brown #836539 ΔE 0.051
- Military Green #667C3E ΔE 0.051
Use #666F4F 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.