#666D40
Closest named color: Dark Moss Green (#606C38). oklch(51.7% 0.066 116), rgb(102, 109, 64).
Aa
White text reads best on this color (5.48:1).
About this color
#666D40 is a medium-dark, muted yellow. In OKLCH its lightness is 52%, its chroma 0.066 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 0.014 away. White text reads best on it, at 5.48:1.
| Hue family | Yellows |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.066) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.82:1 |
| White text | 5.48:1 |
Values
| HEX | #666D40 |
| RGB | rgb(102, 109, 64) |
| HSL | hsl(69, 26%, 34%) |
| OKLCH | oklch(51.7% 0.066 116) |
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 #666D40 | 5.48:1 | AA | Lc -82.7 | Fine for body text |
| Black text on #666D40 | 3.82:1 | AA large text | Lc 26.7 | Dividers and decoration only |
| #666D40 text on white | 5.48:1 | AA | Lc 77.4 | Fine for body text |
| #666D40 text on black | 3.82:1 | AA large text | Lc -24.4 | 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
#BFC4AD
oklch(81% 0.032 117.1)
-
Step 400
400
#9FA581
oklch(70.7% 0.051 115.4)
-
Step 500
500
#878F61
oklch(63.2% 0.066 116.3)
-
Step 600
600
#717947
oklch(55.7% 0.072 116.2)
-
Step 700
700 (this color)
#666D40
oklch(51.7% 0.066 116)
-
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
#262819
oklch(27% 0.026 114.4)
#666D40 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) | #73693D | 0.022 |
| Deuteranopia (no green cones) | #726942 | 0.022 |
| Tritanopia (no blue cones) | #6B6862 | 0.058 |
| Achromatopsia (no color) | #696969 | 0.066 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666D40
#666D40
oklch(51.7% 0.066 116)
- #6B608A
#6B608A
oklch(51.6% 0.066 296)
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 #666D40, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.014
- Muddy Green #657432 ΔE 0.031
- Dark Olive Green #556B2F ΔE 0.035
- Brown Green #706C11 ΔE 0.041
- Browny Green #6F6C0A ΔE 0.044
- Military Green #667C3E ΔE 0.046
- Dirt Brown #836539 ΔE 0.049
- Camo Green #526525 ΔE 0.050
Use #666D40 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.