#645F68
Closest named color: Slate (#516572). oklch(49.3% 0.015 310.4), rgb(100, 95, 104).
Aa
White text reads best on this color (6.21:1).
About this color
#645F68 is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.031 away. White text reads best on it, at 6.21:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.37:1 |
| White text | 6.21:1 |
Values
| HEX | #645F68 |
| RGB | rgb(100, 95, 104) |
| HSL | hsl(273, 5%, 39%) |
| OKLCH | oklch(49.3% 0.015 310.4) |
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 #645F68 | 6.21:1 | AA | Lc -86.2 | Fine for body text |
| Black text on #645F68 | 3.37:1 | AA large text | Lc 23.0 | Dividers and decoration only |
| #645F68 text on white | 6.21:1 | AA | Lc 81.0 | Fine for body text |
| #645F68 text on black | 3.37:1 | AA large text | Lc -20.8 | 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
#EAE9EB
oklch(93.5% 0.003 308.4)
-
Step 200
200
#DAD8DB
oklch(88.5% 0.005 314.8)
-
Step 300
300
#C2BFC4
oklch(80.9% 0.008 312.3)
-
Step 400
400
#A39FA6
oklch(70.8% 0.011 311.1)
-
Step 500
500
#8C8790
oklch(63.1% 0.014 310.4)
-
Step 600
600
#76717B
oklch(55.6% 0.016 308.1)
-
Step 700
700 (this color)
#645F68
oklch(49.3% 0.015 310.4)
-
Step 800
800
#514D54
oklch(42.7% 0.012 311)
-
Step 900
900
#434046
oklch(37.7% 0.011 308.1)
-
Step 950
950
#272629
oklch(27.1% 0.006 301.2)
#645F68 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) | #5E6168 | 0.011 |
| Deuteranopia (no green cones) | #5F6168 | 0.009 |
| Tritanopia (no blue cones) | #646062 | 0.011 |
| Achromatopsia (no color) | #616161 | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645F68
#645F68
oklch(49.3% 0.015 310.4)
- #5E635A
#5E635A
oklch(49.2% 0.015 130.9)
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 #645F68, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.031
- Dim Gray #696969 ΔE 0.032
- Dusty Grape #545775 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.060
- Battleship Gray #6C757D ΔE 0.067
- Dusk #4E5481 ΔE 0.069
- Dark Taupe #7F684E ΔE 0.070
- Dull Purple #84597E ΔE 0.070
Use #645F68 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.