#666D00
Closest named color: Browny Green (#6F6C0A). oklch(51.1% 0.115 114.1), rgb(102, 109, 0).
Aa
White text reads best on this color (5.59:1).
About this color
#666D00 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 51%, its chroma 0.115 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 5.59:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.115) |
| Temperature | in between |
| Nearest name | Browny Green (#6F6C0A) |
| Black text | 3.75:1 |
| White text | 5.59:1 |
Values
| HEX | #666D00 |
| RGB | rgb(102, 109, 0) |
| HSL | hsl(64, 100%, 21%) |
| OKLCH | oklch(51.1% 0.115 114.1) |
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 #666D00 | 5.59:1 | AA | Lc -83.1 | Fine for body text |
| Black text on #666D00 | 3.75:1 | AA large text | Lc 26.3 | Dividers and decoration only |
| #666D00 text on white | 5.59:1 | AA | Lc 77.8 | Fine for body text |
| #666D00 text on black | 3.75:1 | AA large text | Lc -24.0 | 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
#D8DCC5
oklch(88.5% 0.031 115)
-
Step 300
300
#BFC59C
oklch(80.8% 0.056 114.4)
-
Step 400
400
#9FA765
oklch(70.6% 0.089 114.4)
-
Step 500
500
#899137
oklch(63.2% 0.114 114)
-
Step 600
600
#737B05
oklch(55.7% 0.124 114.3)
-
Step 700
700 (this color)
#666D00
oklch(51.1% 0.115 114.1)
-
Step 800
800
#4F5402
oklch(42.7% 0.095 113.7)
-
Step 900
900
#414610
oklch(37.8% 0.074 114.6)
-
Step 950
950
#26290B
oklch(27% 0.048 114.4)
#666D00 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) | #766700 | 0.030 |
| Deuteranopia (no green cones) | #766910 | 0.030 |
| Tritanopia (no blue cones) | #6E665C | 0.102 |
| Achromatopsia (no color) | #686868 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666D00
#666D00
oklch(51.1% 0.115 114.1)
- #6B57A1
#6B57A1
oklch(51% 0.115 294.4)
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 #666D00, 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 0.024
- Muddy Green #657432 ΔE 0.032
- Dark Olive Green #556B2F ΔE 0.037
- Olive Green #677A04 ΔE 0.038
- Greeny Brown #696006 ΔE 0.039
- Murky Green #6C7A0E ΔE 0.039
Use #666D00 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.