#666B23
Closest named color: Brown Green (#706C11). oklch(50.8% 0.094 113.1), rgb(102, 107, 35).
Aa
White text reads best on this color (5.68:1).
About this color
#666B23 is a medium-dark, moderately saturated yellow. In OKLCH its lightness is 51%, its chroma 0.094 and its hue 113°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Brown Green (#706C11), ΔE 0.018 away. White text reads best on it, at 5.68:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.094) |
| Temperature | in between |
| Nearest name | Brown Green (#706C11) |
| Black text | 3.69:1 |
| White text | 5.68:1 |
Values
| HEX | #666B23 |
| RGB | rgb(102, 107, 35) |
| HSL | hsl(64, 51%, 28%) |
| OKLCH | oklch(50.8% 0.094 113.1) |
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 #666B23 | 5.68:1 | AA | Lc -83.6 | Fine for body text |
| Black text on #666B23 | 3.69:1 | AA large text | Lc 25.7 | Dividers and decoration only |
| #666B23 text on white | 5.68:1 | AA | Lc 78.4 | Fine for body text |
| #666B23 text on black | 3.69:1 | AA large text | Lc -23.4 | 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
#F5F6F1
oklch(97.1% 0.007 115.7)
-
Step 100
100
#EAEBE1
oklch(93.7% 0.013 111.3)
-
Step 200
200
#D9DBC8
oklch(88.5% 0.026 111.8)
-
Step 300
300
#C0C4A3
oklch(80.8% 0.045 113)
-
Step 400
400
#A0A671
oklch(70.7% 0.073 113.5)
-
Step 500
500
#8A904A
oklch(63.2% 0.094 113.1)
-
Step 600
600
#74792B
oklch(55.6% 0.101 112.7)
-
Step 700
700 (this color)
#666B23
oklch(50.8% 0.094 113.1)
-
Step 800
800
#4F531B
oklch(42.6% 0.078 113.1)
-
Step 900
900
#42451C
oklch(37.7% 0.061 112.8)
-
Step 950
950
#262811
oklch(26.8% 0.038 113.1)
#666B23 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) | #73661A | 0.023 |
| Deuteranopia (no green cones) | #736728 | 0.025 |
| Tritanopia (no blue cones) | #6D655C | 0.083 |
| Achromatopsia (no color) | #676767 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666B23
#666B23
oklch(50.8% 0.094 113.1)
- #685A97
#685A97
oklch(50.8% 0.096 293.2)
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 #666B23, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brown Green #706C11 ΔE 0.018
- Browny Green #6F6C0A ΔE 0.019
- Dark Moss Green #606C38 ΔE 0.021
- Mud Green #606602 ΔE 0.025
- Dark Olive Green #556B2F ΔE 0.025
- Muddy Green #657432 ΔE 0.026
- Greeny Brown #696006 ΔE 0.031
- Camo Green #526525 ΔE 0.036
Use #666B23 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.