#666A37
Closest named color: Dark Moss Green (#606C38). oklch(50.8% 0.073 112.6), rgb(102, 106, 55).
Aa
White text reads best on this color (5.70:1).
About this color
#666A37 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 51%, its chroma 0.073 and its hue 113°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Moss Green (#606C38), ΔE 0.010 away. White text reads best on it, at 5.70:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.073) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.68:1 |
| White text | 5.70:1 |
Values
| HEX | #666A37 |
| RGB | rgb(102, 106, 55) |
| HSL | hsl(65, 32%, 32%) |
| OKLCH | oklch(50.8% 0.073 112.6) |
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 #666A37 | 5.70:1 | AA | Lc -83.8 | Fine for body text |
| Black text on #666A37 | 3.68:1 | AA large text | Lc 25.6 | Dividers and decoration only |
| #666A37 text on white | 5.70:1 | AA | Lc 78.5 | Fine for body text |
| #666A37 text on black | 3.68:1 | AA large text | Lc -23.3 | 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
#F5F6F2
oklch(97.1% 0.005 117.9)
-
Step 100
100
#EAEBE3
oklch(93.7% 0.011 112.4)
-
Step 200
200
#D9DBCC
oklch(88.6% 0.02 113)
-
Step 300
300
#C0C3AA
oklch(80.8% 0.034 112.7)
-
Step 400
400
#A1A57C
oklch(70.8% 0.057 112.4)
-
Step 500
500
#8A8E5B
oklch(63.1% 0.071 112.1)
-
Step 600
600
#747840
oklch(55.6% 0.078 112.3)
-
Step 700
700 (this color)
#666A37
oklch(50.8% 0.073 112.6)
-
Step 800
800
#4F522A
oklch(42.6% 0.06 112.4)
-
Step 900
900
#424426
oklch(37.7% 0.047 111.7)
-
Step 950
950
#262817
oklch(26.9% 0.03 113.9)
#666A37 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) | #716633 | 0.019 |
| Deuteranopia (no green cones) | #71673A | 0.020 |
| Tritanopia (no blue cones) | #6C655E | 0.064 |
| Achromatopsia (no color) | #666666 | 0.073 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666A37
#666A37
oklch(50.8% 0.073 112.6)
- #675E8C
#675E8C
oklch(50.9% 0.073 292.6)
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 #666A37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.010
- Dark Olive Green #556B2F ΔE 0.029
- Muddy Green #657432 ΔE 0.032
- Brown Green #706C11 ΔE 0.035
- Browny Green #6F6C0A ΔE 0.037
- Greeny Brown #696006 ΔE 0.040
- Camo Green #526525 ΔE 0.041
- Mud Green #606602 ΔE 0.041
Use #666A37 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.