#666C00
Closest named color: Browny Green (#6F6C0A). oklch(50.9% 0.114 113.5), rgb(102, 108, 0).
Aa
White text reads best on this color (5.66:1).
About this color
#666C00 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 51%, its chroma 0.114 and its hue 114°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Browny Green (#6F6C0A), ΔE 0.016 away. White text reads best on it, at 5.66:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.114) |
| Temperature | in between |
| Nearest name | Browny Green (#6F6C0A) |
| Black text | 3.70:1 |
| White text | 5.66:1 |
Values
| HEX | #666C00 |
| RGB | rgb(102, 108, 0) |
| HSL | hsl(63, 100%, 21%) |
| OKLCH | oklch(50.9% 0.114 113.5) |
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 #666C00 | 5.66:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #666C00 | 3.70:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #666C00 text on white | 5.66:1 | AA | Lc 78.1 | Fine for body text |
| #666C00 text on black | 3.70:1 | AA large text | Lc -23.6 | 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
#F5F6F0
oklch(97.1% 0.008 114.2)
-
Step 100
100
#E9EBDF
oklch(93.5% 0.016 114.4)
-
Step 200
200
#D9DCC5
oklch(88.6% 0.031 113.1)
-
Step 300
300
#C0C59C
oklch(80.9% 0.056 113.3)
-
Step 400
400
#A0A765
oklch(70.7% 0.089 113.6)
-
Step 500
500
#899138
oklch(63.2% 0.113 114)
-
Step 600
600
#747A07
oklch(55.6% 0.122 113.2)
-
Step 700
700 (this color)
#666C00
oklch(50.9% 0.114 113.5)
-
Step 800
800
#4F5403
oklch(42.7% 0.094 113.7)
-
Step 900
900
#424610
oklch(37.9% 0.074 113.6)
-
Step 950
950
#26290C
oklch(27% 0.046 114.5)
#666C00 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) | #756600 | 0.029 |
| Deuteranopia (no green cones) | #75680F | 0.028 |
| Tritanopia (no blue cones) | #6E655B | 0.101 |
| Achromatopsia (no color) | #676767 | 0.114 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666C00
#666C00
oklch(50.9% 0.114 113.5)
- #6A57A0
#6A57A0
oklch(50.9% 0.114 294)
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 #666C00, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Browny Green #6F6C0A ΔE 0.016
- Brown Green #706C11 ΔE 0.019
- Mud Green #606602 ΔE 0.021
- Muddy Green #657432 ΔE 0.033
- Dark Olive Green #556B2F ΔE 0.036
- Greeny Brown #696006 ΔE 0.036
- Dark Moss Green #606C38 ΔE 0.039
- Olive Green #677A04 ΔE 0.041
Use #666C00 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.