#666C23
Closest named color: Brown Green (#706C11). oklch(51.1% 0.096 113.8), rgb(102, 108, 35).
Aa
White text reads best on this color (5.62:1).
About this color
#666C23 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 51%, its chroma 0.096 and its hue 114°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Brown Green (#706C11), ΔE 0.017 away. White text reads best on it, at 5.62:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.096) |
| Temperature | in between |
| Nearest name | Brown Green (#706C11) |
| Black text | 3.73:1 |
| White text | 5.62:1 |
Values
| HEX | #666C23 |
| RGB | rgb(102, 108, 35) |
| HSL | hsl(65, 51%, 28%) |
| OKLCH | oklch(51.1% 0.096 113.8) |
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 #666C23 | 5.62:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #666C23 | 3.73:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #666C23 text on white | 5.62:1 | AA | Lc 78.0 | Fine for body text |
| #666C23 text on black | 3.73:1 | AA large text | Lc -23.7 | 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
#F5F6F1
oklch(97.1% 0.007 115.7)
-
Step 100
100
#E9EBE1
oklch(93.6% 0.013 115.8)
-
Step 200
200
#D8DBC8
oklch(88.4% 0.026 114.2)
-
Step 300
300
#C0C4A3
oklch(80.8% 0.045 113)
-
Step 400
400
#A0A670
oklch(70.7% 0.074 113.5)
-
Step 500
500
#899049
oklch(63.1% 0.095 113.8)
-
Step 600
600
#737A2A
oklch(55.7% 0.103 114)
-
Step 700
700 (this color)
#666C23
oklch(51.1% 0.096 113.8)
-
Step 800
800
#4F531A
oklch(42.6% 0.078 113.1)
-
Step 900
900
#41451C
oklch(37.6% 0.061 114)
-
Step 950
950
#262911
oklch(27.1% 0.04 115)
#666C23 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) | #746719 | 0.024 |
| Deuteranopia (no green cones) | #746828 | 0.026 |
| Tritanopia (no blue cones) | #6D665D | 0.084 |
| Achromatopsia (no color) | #676767 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666C23
#666C23
oklch(51.1% 0.096 113.8)
- #695B98
#695B98
oklch(51.1% 0.096 293.3)
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 #666C23, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown Green #706C11 ΔE 0.017
- Browny Green #6F6C0A ΔE 0.018
- Dark Moss Green #606C38 ΔE 0.022
- Muddy Green #657432 ΔE 0.023
- Dark Olive Green #556B2F ΔE 0.026
- Mud Green #606602 ΔE 0.026
- Greeny Brown #696006 ΔE 0.034
- Camo Green #526525 ΔE 0.038
Use #666C23 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.