#645C68
Closest named color: Slate (#516572). oklch(48.7% 0.021 314.6), rgb(100, 92, 104).
Aa
White text reads best on this color (6.41:1).
About this color
#645C68 is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.021. 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 6.41:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.021) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.27:1 |
| White text | 6.41:1 |
Values
| HEX | #645C68 |
| RGB | rgb(100, 92, 104) |
| HSL | hsl(280, 6%, 38%) |
| OKLCH | oklch(48.7% 0.021 314.6) |
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 #645C68 | 6.41:1 | AA | Lc -87.0 | Fine for body text |
| Black text on #645C68 | 3.27:1 | AA large text | Lc 22.2 | Dividers and decoration only |
| #645C68 text on white | 6.41:1 | AA | Lc 81.9 | Fine for body text |
| #645C68 text on black | 3.27:1 | AA large text | Lc -20.0 | 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 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
#DAD8DC
oklch(88.5% 0.006 308.4)
-
Step 300
300
#C3BFC5
oklch(81% 0.009 314.8)
-
Step 400
400
#A49EA8
oklch(70.7% 0.016 312.2)
-
Step 500
500
#8E8693
oklch(63.1% 0.021 312.7)
-
Step 600
600
#786F7D
oklch(55.5% 0.024 313.7)
-
Step 700
700 (this color)
#645C68
oklch(48.7% 0.021 314.6)
-
Step 800
800
#534C56
oklch(42.7% 0.019 315.9)
-
Step 900
900
#443F47
oklch(37.6% 0.015 313)
-
Step 950
950
#282529
oklch(26.9% 0.008 317.7)
#645C68 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) | #5B5E69 | 0.015 |
| Deuteranopia (no green cones) | #5C5F68 | 0.015 |
| Tritanopia (no blue cones) | #645D60 | 0.014 |
| Achromatopsia (no color) | #5F5F5F | 0.021 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645C68
#645C68
oklch(48.7% 0.021 314.6)
- #5A6256
#5A6256
oklch(48.5% 0.021 135)
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 #645C68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.036
- Dusty Grape #545775 ΔE 0.039
- Dim Gray #696969 ΔE 0.040
- YInMn Blue #415A77 ΔE 0.057
- Dusk #4E5481 ΔE 0.064
- Dull Purple #84597E ΔE 0.068
- Dark Mauve #874C62 ΔE 0.070
- Muted Purple #805B87 ΔE 0.071
Use #645C68 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.