#666E40
Closest named color: Dark Moss Green (#606C38). oklch(52% 0.067 116.9), rgb(102, 110, 64).
Aa
White text reads best on this color (5.42:1).
About this color
#666E40 is a medium-dark, muted yellow. In OKLCH its lightness is 52%, its chroma 0.067 and its hue 117°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Moss Green (#606C38), ΔE 0.015 away. White text reads best on it, at 5.42:1.
| Hue family | Yellows |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.067) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.86:1 |
| White text | 5.42:1 |
Values
| HEX | #666E40 |
| RGB | rgb(102, 110, 64) |
| HSL | hsl(70, 26%, 34%) |
| OKLCH | oklch(52% 0.067 116.9) |
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 #666E40 | 5.42:1 | AA | Lc -82.4 | Fine for body text |
| Black text on #666E40 | 3.86:1 | AA large text | Lc 27.0 | Dividers and decoration only |
| #666E40 text on white | 5.42:1 | AA | Lc 77.1 | Fine for body text |
| #666E40 text on black | 3.86:1 | AA large text | Lc -24.7 | 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
#F5F6F3
oklch(97.2% 0.004 121.6)
-
Step 100
100
#E9EBE4
oklch(93.7% 0.01 119.6)
-
Step 200
200
#D8DBCE
oklch(88.6% 0.018 117.3)
-
Step 300
300
#BFC4AC
oklch(81% 0.033 116.7)
-
Step 400
400
#9EA580
oklch(70.6% 0.052 116.5)
-
Step 500
500
#868F60
oklch(63.1% 0.067 117.2)
-
Step 600
600
#707947
oklch(55.6% 0.072 117.1)
-
Step 700
700 (this color)
#666E40
oklch(52% 0.067 116.9)
-
Step 800
800
#4D532F
oklch(42.7% 0.055 116.5)
-
Step 900
900
#40452A
oklch(37.8% 0.043 117.1)
-
Step 950
950
#252819
oklch(26.9% 0.027 117.4)
#666E40 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) | #746A3C | 0.023 |
| Deuteranopia (no green cones) | #736A42 | 0.024 |
| Tritanopia (no blue cones) | #6B6963 | 0.059 |
| Achromatopsia (no color) | #6A6A6A | 0.068 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666E40
#666E40
oklch(52% 0.067 116.9)
- #6D618B
#6D618B
oklch(52.1% 0.067 297.2)
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 #666E40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.015
- Muddy Green #657432 ΔE 0.028
- Dark Olive Green #556B2F ΔE 0.035
- Brown Green #706C11 ΔE 0.040
- Browny Green #6F6C0A ΔE 0.043
- Military Green #667C3E ΔE 0.043
- Dirt Brown #836539 ΔE 0.050
- Grey Brown #7F7053 ΔE 0.050
Use #666E40 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.