#666B57
Closest named color: Dim Gray (#696969). oklch(51.8% 0.031 118.9), rgb(102, 107, 87).
Aa
White text reads best on this color (5.51:1).
About this color
#666B57 is a medium-dark, muted yellow. In OKLCH its lightness is 52%, its chroma 0.031 and its hue 119°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dim Gray (#696969), ΔE 0.031 away. White text reads best on it, at 5.51:1.
| Hue family | Yellows |
| Lightness | medium-dark (52%) |
| Chroma | muted (0.031) |
| Temperature | in between |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.80:1 |
| White text | 5.51:1 |
Values
| HEX | #666B57 |
| RGB | rgb(102, 107, 87) |
| HSL | hsl(75, 10%, 38%) |
| OKLCH | oklch(51.8% 0.031 118.9) |
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 #666B57 | 5.51:1 | AA | Lc -82.9 | Fine for body text |
| Black text on #666B57 | 3.80:1 | AA large text | Lc 26.5 | Dividers and decoration only |
| #666B57 text on white | 5.51:1 | AA | Lc 77.6 | Fine for body text |
| #666B57 text on black | 3.80:1 | AA large text | Lc -24.2 | 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
#F5F6F4
oklch(97.2% 0.003 128.5)
-
Step 100
100
#E9EAE7
oklch(93.5% 0.004 121.6)
-
Step 200
200
#D8DAD4
oklch(88.5% 0.008 121.6)
-
Step 300
300
#BFC2B7
oklch(80.9% 0.016 119.2)
-
Step 400
400
#9FA392
oklch(70.7% 0.025 117.8)
-
Step 500
500
#878C78
oklch(63% 0.03 118.7)
-
Step 600
600
#717660
oklch(55.5% 0.033 117.9)
-
Step 700
700 (this color)
#666B57
oklch(51.8% 0.031 118.9)
-
Step 800
800
#4D5141
oklch(42.6% 0.026 118.9)
-
Step 900
900
#404337
oklch(37.6% 0.02 118.8)
-
Step 950
950
#262720
oklch(26.9% 0.013 113.9)
#666B57 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) | #6E6956 | 0.013 |
| Deuteranopia (no green cones) | #6D6958 | 0.012 |
| Tritanopia (no blue cones) | #686965 | 0.025 |
| Achromatopsia (no color) | #696969 | 0.031 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666B57
#666B57
oklch(51.8% 0.031 118.9)
- #6A6578
#6A6578
oklch(51.8% 0.03 297.4)
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 #666B57, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.031
- Dark Taupe #7F684E ΔE 0.039
- Grey Brown #7F7053 ΔE 0.044
- Dark Moss Green #606C38 ΔE 0.046
- Dirt Brown #836539 ΔE 0.055
- Dull Brown #876E4B ΔE 0.056
- Slate #516572 ΔE 0.058
- Battleship Gray #6C757D ΔE 0.059
Use #666B57 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.