#666E37
Closest named color: Dark Moss Green (#606C38). oklch(51.8% 0.078 116), rgb(102, 110, 55).
Aa
White text reads best on this color (5.45:1).
About this color
#666E37 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 52%, its chroma 0.078 and its hue 116°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Moss Green (#606C38), ΔE 0.011 away. White text reads best on it, at 5.45:1.
| Hue family | Yellows |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.078) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.85:1 |
| White text | 5.45:1 |
Values
| HEX | #666E37 |
| RGB | rgb(102, 110, 55) |
| HSL | hsl(69, 33%, 32%) |
| OKLCH | oklch(51.8% 0.078 116) |
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 #666E37 | 5.45:1 | AA | Lc -82.5 | Fine for body text |
| Black text on #666E37 | 3.85:1 | AA large text | Lc 26.9 | Dividers and decoration only |
| #666E37 text on white | 5.45:1 | AA | Lc 77.2 | Fine for body text |
| #666E37 text on black | 3.85:1 | AA large text | Lc -24.6 | 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
#E9EBE3
oklch(93.6% 0.011 118)
-
Step 200
200
#D8DBCC
oklch(88.5% 0.02 116)
-
Step 300
300
#BFC4A9
oklch(80.9% 0.037 115.8)
-
Step 400
400
#9EA67B
oklch(70.8% 0.06 116.5)
-
Step 500
500
#879058
oklch(63.2% 0.078 116.1)
-
Step 600
600
#71793D
oklch(55.5% 0.084 115.4)
-
Step 700
700 (this color)
#666E37
oklch(51.8% 0.078 116)
-
Step 800
800
#4D5328
oklch(42.6% 0.064 115.7)
-
Step 900
900
#404525
oklch(37.7% 0.05 116.1)
-
Step 950
950
#252816
oklch(26.8% 0.031 116.3)
#666E37 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) | #756932 | 0.025 |
| Deuteranopia (no green cones) | #746A3A | 0.025 |
| Tritanopia (no blue cones) | #6B6961 | 0.067 |
| Achromatopsia (no color) | #696969 | 0.078 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666E37
#666E37
oklch(51.8% 0.078 116)
- #6C5F90
#6C5F90
oklch(51.8% 0.077 295.8)
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 #666E37, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.011
- Muddy Green #657432 ΔE 0.021
- Dark Olive Green #556B2F ΔE 0.029
- Brown Green #706C11 ΔE 0.030
- Browny Green #6F6C0A ΔE 0.033
- Military Green #667C3E ΔE 0.040
- Mud Green #606602 ΔE 0.043
- Camo Green #526525 ΔE 0.046
Use #666E37 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.