#665B64
Closest named color: Slate (#516572). oklch(48.5% 0.02 331.9), rgb(102, 91, 100).
Aa
White text reads best on this color (6.47:1).
About this color
#665B64 is a medium-dark close to neutral grey. In OKLCH its lightness is 48%, its chroma 0.020. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.040 away. White text reads best on it, at 6.47:1.
| Hue family | Neutrals |
| Lightness | medium-dark (48%) |
| Chroma | close to neutral grey (0.020) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.24:1 |
| White text | 6.47:1 |
Values
| HEX | #665B64 |
| RGB | rgb(102, 91, 100) |
| HSL | hsl(311, 6%, 38%) |
| OKLCH | oklch(48.5% 0.02 331.9) |
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 #665B64 | 6.47:1 | AA | Lc -87.2 | Fine for body text |
| Black text on #665B64 | 3.24:1 | AA large text | Lc 21.9 | Dividers and decoration only |
| #665B64 text on white | 6.47:1 | AA | Lc 82.1 | Fine for body text |
| #665B64 text on black | 3.24:1 | AA large text | Lc -19.8 | 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
#F6F5F6
oklch(97.1% 0.002 325.6)
-
Step 100
100
#EBE9EB
oklch(93.6% 0.003 325.6)
-
Step 200
200
#DBD8DB
oklch(88.5% 0.005 325.6)
-
Step 300
300
#C4BEC3
oklch(80.8% 0.01 331)
-
Step 400
400
#A79DA5
oklch(70.7% 0.016 332.3)
-
Step 500
500
#91858F
oklch(63.1% 0.02 331.3)
-
Step 600
600
#7B6F79
oklch(55.6% 0.021 331.3)
-
Step 700
700 (this color)
#665B64
oklch(48.5% 0.02 331.9)
-
Step 800
800
#554C53
oklch(42.8% 0.016 333.4)
-
Step 900
900
#463F45
oklch(37.7% 0.014 330.5)
-
Step 950
950
#292528
oklch(27% 0.008 334.4)
#665B64 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) | #5B5D64 | 0.018 |
| Deuteranopia (no green cones) | #5D5F64 | 0.018 |
| Tritanopia (no blue cones) | #675B5E | 0.010 |
| Achromatopsia (no color) | #5E5E5E | 0.020 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665B64
#665B64
oklch(48.5% 0.02 331.9)
- #576259
#576259
oklch(48.4% 0.02 150.8)
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 #665B64, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.040
- Dim Gray #696969 ΔE 0.041
- Dusty Grape #545775 ΔE 0.044
- YInMn Blue #415A77 ΔE 0.061
- Dark Mauve #874C62 ΔE 0.067
- Dusk #4E5481 ΔE 0.069
- Dull Purple #84597E ΔE 0.069
- Brownish Purple #76424E ΔE 0.070
Use #665B64 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.