#666E54
Closest named color: Dark Moss Green (#606C38). oklch(52.4% 0.04 121.7), rgb(102, 110, 84).
Aa
White text reads best on this color (5.35:1).
About this color
#666E54 is a medium-dark, muted yellow. In OKLCH its lightness is 52%, its chroma 0.040 and its hue 122°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dark Moss Green (#606C38), ΔE 0.039 away. White text reads best on it, at 5.35:1.
| Hue family | Yellows |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.040) |
| Temperature | in between |
| Nearest name | Dark Moss Green (#606C38) |
| Black text | 3.92:1 |
| White text | 5.35:1 |
Values
| HEX | #666E54 |
| RGB | rgb(102, 110, 84) |
| HSL | hsl(78, 13%, 38%) |
| OKLCH | oklch(52.4% 0.04 121.7) |
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 #666E54 | 5.35:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #666E54 | 3.92:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #666E54 text on white | 5.35:1 | AA | Lc 76.7 | Fine for body text |
| #666E54 text on black | 3.92:1 | AA large text | Lc -25.1 | 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 600.
-
Step 50
50
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E9EAE7
oklch(93.5% 0.004 121.6)
-
Step 200
200
#D8DAD3
oklch(88.5% 0.01 119.6)
-
Step 300
300
#BEC3B6
oklch(81% 0.019 124)
-
Step 400
400
#9DA490
oklch(70.7% 0.029 122.9)
-
Step 500
500
#868D74
oklch(63.1% 0.037 120.2)
-
Step 600
600 (this color)
#666E54
oklch(52.4% 0.04 121.7)
-
Step 700
700
#5D644D
oklch(49% 0.036 121.5)
-
Step 800
800
#4C523F
oklch(42.7% 0.031 122)
-
Step 900
900
#3F4435
oklch(37.7% 0.026 122.6)
-
Step 950
950
#25281F
oklch(27.1% 0.017 122.5)
#666E54 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) | #716B52 | 0.018 |
| Deuteranopia (no green cones) | #706B55 | 0.018 |
| Tritanopia (no blue cones) | #686B67 | 0.034 |
| Achromatopsia (no color) | #6B6B6B | 0.041 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666E54
#666E54
oklch(52.4% 0.04 121.7)
- #6E657E
#6E657E
oklch(52.4% 0.04 301.5)
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 #666E54, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Moss Green #606C38 ΔE 0.039
- Grey Brown #7F7053 ΔE 0.040
- Dark Taupe #7F684E ΔE 0.040
- Dim Gray #696969 ΔE 0.041
- Dull Brown #876E4B ΔE 0.052
- Dirt Brown #836539 ΔE 0.053
- Muddy Green #657432 ΔE 0.053
- Dark Olive Green #556B2F ΔE 0.057
Use #666E54 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.