#666D5F
Closest named color: Dim Gray (#696969). oklch(52.4% 0.023 129), rgb(102, 109, 95).
Aa
White text reads best on this color (5.36:1).
About this color
#666D5F is a medium-dark close to neutral grey. In OKLCH its lightness is 52%, its chroma 0.023. It has too little chroma to lean warm or cool. The nearest named color is Dim Gray (#696969), ΔE 0.023 away. White text reads best on it, at 5.36:1.
| Hue family | Neutrals |
| Lightness | medium-dark (52%) |
| Chroma | close to neutral grey (0.023) |
| Temperature | neutral |
| Nearest name | Dim Gray (#696969) |
| Black text | 3.91:1 |
| White text | 5.36:1 |
Values
| HEX | #666D5F |
| RGB | rgb(102, 109, 95) |
| HSL | hsl(90, 7%, 40%) |
| OKLCH | oklch(52.4% 0.023 129) |
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 #666D5F | 5.36:1 | AA | Lc -82.0 | Fine for body text |
| Black text on #666D5F | 3.91:1 | AA large text | Lc 27.4 | Dividers and decoration only |
| #666D5F text on white | 5.36:1 | AA | Lc 76.7 | Fine for body text |
| #666D5F text on black | 3.91:1 | AA large text | Lc -25.0 | 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
#F5F6F5
oklch(97.2% 0.002 145.6)
-
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
#BEC2BB
oklch(80.9% 0.011 131.4)
-
Step 400
400
#9DA398
oklch(70.7% 0.017 130.5)
-
Step 500
500
#858C7F
oklch(63% 0.021 130.3)
-
Step 600
600 (this color)
#666D5F
oklch(52.4% 0.023 129)
-
Step 700
700
#5D6356
oklch(49% 0.022 127.5)
-
Step 800
800
#4C5147
oklch(42.7% 0.017 128.9)
-
Step 900
900
#3F433B
oklch(37.6% 0.014 128.9)
-
Step 950
950
#252723
oklch(26.9% 0.008 128.8)
#666D5F 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) | #6F6B5E | 0.014 |
| Deuteranopia (no green cones) | #6D6A60 | 0.014 |
| Tritanopia (no blue cones) | #676C69 | 0.017 |
| Achromatopsia (no color) | #6B6B6B | 0.023 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #666D5F
#666D5F
oklch(52.4% 0.023 129)
- #6E6775
#6E6775
oklch(52.5% 0.023 308)
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 #666D5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dim Gray #696969 ΔE 0.023
- Dark Taupe #7F684E ΔE 0.042
- Grey Brown #7F7053 ΔE 0.044
- Battleship Gray #6C757D ΔE 0.047
- Slate #516572 ΔE 0.053
- Dark Moss Green #606C38 ΔE 0.056
- Dull Brown #876E4B ΔE 0.057
- Dirt Brown #836539 ΔE 0.061
Use #666D5F 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.