#646B4B
Closest named color: Dark Moss Green (#606C38). oklch(51.3% 0.049 118.2), rgb(100, 107, 75).
Aa
White text reads best on this color (5.60:1).
About this color
#646B4B is a medium-dark, muted yellow. In OKLCH its lightness is 51%, its chroma 0.049 and its hue 118°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Moss Green (#606C38), ΔE 0.028 away. White text reads best on it, at 5.60:1.
| Hue family | Yellows |
| Lightness | medium-dark (51%) |
| Chroma | muted (0.049) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.74:1 |
| White text | 5.60:1 |
Values
| HEX | #646B4B |
| RGB | rgb(100, 107, 75) |
| HSL | hsl(73, 18%, 36%) |
| OKLCH | oklch(51.3% 0.049 118.2) |
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 #646B4B | 5.60:1 | AA | Lc -83.3 | Fine for body text |
| Black text on #646B4B | 3.74:1 | AA large text | Lc 26.0 | Dividers and decoration only |
| #646B4B text on white | 5.60:1 | AA | Lc 78.0 | Fine for body text |
| #646B4B text on black | 3.74:1 | AA large text | Lc -23.8 | 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
#E9EAE5
oklch(93.5% 0.007 115.7)
-
Step 200
200
#D8DAD1
oklch(88.4% 0.012 116.8)
-
Step 300
300
#BFC3B2
oklch(80.9% 0.024 117.7)
-
Step 400
400
#9EA48A
oklch(70.7% 0.037 117.9)
-
Step 500
500
#868E6D
oklch(63.1% 0.048 118.9)
-
Step 600
600
#707855
oklch(55.6% 0.052 118.6)
-
Step 700
700 (this color)
#646B4B
oklch(51.3% 0.049 118.2)
-
Step 800
800
#4D5239
oklch(42.7% 0.04 117.3)
-
Step 900
900
#404431
oklch(37.7% 0.031 117.6)
-
Step 950
950
#25281D
oklch(27% 0.02 120.1)
#646B4B 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) | #6F6849 | 0.018 |
| Deuteranopia (no green cones) | #6E684C | 0.018 |
| Tritanopia (no blue cones) | #676863 | 0.041 |
| Achromatopsia (no color) | #686868 | 0.049 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646B4B
#646B4B
oklch(51.3% 0.049 118.2)
- #6A6180
#6A6180
oklch(51.3% 0.049 297.9)
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 #646B4B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.028
- Dark Taupe #7F684E ΔE 0.044
- Dark Olive Green #556B2F ΔE 0.045
- Muddy Green #657432 ΔE 0.048
- Grey Brown #7F7053 ΔE 0.048
- Dim Gray #696969 ΔE 0.049
- Dirt Brown #836539 ΔE 0.051
- Camo Green #526525 ΔE 0.057
Use #646B4B 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.