#666C61
Closest named color: Dim Gray (#696969). oklch(52.3% 0.018 130.6), rgb(102, 108, 97).
Aa
White text reads best on this color (5.40:1).
About this color
#666C61 is a medium-dark close to neutral grey. In OKLCH its lightness is 52%, its chroma 0.018. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.019 away. White text reads best on it, at 5.40:1.
| Hue family | Neutrals |
| Lightness | medium-dark (52%) |
| Chroma | close to neutral grey (0.018) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.88:1 |
| White text | 5.40:1 |
Values
| HEX | #666C61 |
| RGB | rgb(102, 108, 97) |
| HSL | hsl(93, 5%, 40%) |
| OKLCH | oklch(52.3% 0.018 130.6) |
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 #666C61 | 5.40:1 | AA | Lc -82.3 | Fine for body text |
| Black text on #666C61 | 3.88:1 | AA large text | Lc 27.1 | Dividers and decoration only |
| #666C61 text on white | 5.40:1 | AA | Lc 77.0 | Fine for body text |
| #666C61 text on black | 3.88:1 | AA large text | Lc -24.8 | 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
#F5F5F5
oklch(97% 0 0)
-
Step 100
100
#E9EAE8
oklch(93.6% 0.003 128.5)
-
Step 200
200
#D8DAD6
oklch(88.6% 0.006 128.5)
-
Step 300
300
#BEC2BC
oklch(80.9% 0.009 134.9)
-
Step 400
400
#9DA299
oklch(70.6% 0.014 130.8)
-
Step 500
500
#868C80
oklch(63.2% 0.019 128.8)
-
Step 600
600
#6F766A
oklch(55.6% 0.02 132)
-
Step 700
700 (this color)
#666C61
oklch(52.3% 0.018 130.6)
-
Step 800
800
#4C5148
oklch(42.7% 0.016 131)
-
Step 900
900
#3F433C
oklch(37.7% 0.013 131.6)
-
Step 950
950
#252723
oklch(26.9% 0.008 128.8)
#666C61 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) | #6D6A60 | 0.011 |
| Deuteranopia (no green cones) | #6C6A61 | 0.010 |
| Tritanopia (no blue cones) | #666B69 | 0.014 |
| Achromatopsia (no color) | #6A6A6A | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666C61
#666C61
oklch(52.3% 0.018 130.6)
- #6D6772
#6D6772
oklch(52.3% 0.018 309.9)
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 #666C61, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.019
- Dark Taupe #7F684E ΔE 0.044
- Battleship Gray #6C757D ΔE 0.046
- Grey Brown #7F7053 ΔE 0.046
- Slate #516572 ΔE 0.049
- Dull Brown #876E4B ΔE 0.060
- Dark Moss Green #606C38 ΔE 0.060
- Battleship Grey #6B7C85 ΔE 0.062
Use #666C61 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.