#645C65
Closest named color: Slate (#516572). oklch(48.5% 0.017 322.4), rgb(100, 92, 101).
Aa
White text reads best on this color (6.44:1).
About this color
#645C65 is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.017. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.036 away. White text reads best on it, at 6.44:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.017) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.26:1 |
| White text | 6.44:1 |
Values
| HEX | #645C65 |
| RGB | rgb(100, 92, 101) |
| HSL | hsl(293, 5%, 38%) |
| OKLCH | oklch(48.5% 0.017 322.4) |
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 #645C65 | 6.44:1 | AA | Lc -87.1 | Fine for body text |
| Black text on #645C65 | 3.26:1 | AA large text | Lc 22.0 | Dividers and decoration only |
| #645C65 text on white | 6.44:1 | AA | Lc 82.0 | Fine for body text |
| #645C65 text on black | 3.26:1 | AA large text | Lc -19.9 | 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
#EAE9EB
oklch(93.5% 0.003 308.4)
-
Step 200
200
#DBD8DB
oklch(88.5% 0.005 325.6)
-
Step 300
300
#C3BFC4
oklch(80.9% 0.008 319.4)
-
Step 400
400
#A59EA6
oklch(70.8% 0.014 321.9)
-
Step 500
500
#8F8690
oklch(63.1% 0.018 322.7)
-
Step 600
600
#79707A
oklch(55.7% 0.019 322.8)
-
Step 700
700 (this color)
#645C65
oklch(48.5% 0.017 322.4)
-
Step 800
800
#534C54
oklch(42.6% 0.016 322)
-
Step 900
900
#454045
oklch(37.8% 0.011 325.8)
-
Step 950
950
#282528
oklch(26.9% 0.007 325.8)
#645C65 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) | #5B5E65 | 0.015 |
| Deuteranopia (no green cones) | #5D5F65 | 0.014 |
| Tritanopia (no blue cones) | #645D5F | 0.011 |
| Achromatopsia (no color) | #5E5E5E | 0.018 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645C65
#645C65
oklch(48.5% 0.017 322.4)
- #5A6259
#5A6259
oklch(48.6% 0.017 142.2)
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 #645C65, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.036
- Dim Gray #696969 ΔE 0.039
- Dusty Grape #545775 ΔE 0.042
- YInMn Blue #415A77 ΔE 0.059
- Dusk #4E5481 ΔE 0.067
- Dark Mauve #874C62 ΔE 0.071
- Dull Purple #84597E ΔE 0.071
- Dark Taupe #7F684E ΔE 0.073
Use #645C65 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.