#645A63
Closest named color: Slate (#516572). oklch(48% 0.019 329), rgb(100, 90, 99).
Aa
White text reads best on this color (6.59:1).
About this color
#645A63 is a medium-dark close to neutral grey. In OKLCH its lightness is 48%, its chroma 0.019. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.041 away. White text reads best on it, at 6.59:1.
| Hue family | Neutrals |
| Lightness | medium-dark (48%) |
| Chroma | close to neutral grey (0.019) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.18:1 |
| White text | 6.59:1 |
Values
| HEX | #645A63 |
| RGB | rgb(100, 90, 99) |
| HSL | hsl(306, 5%, 37%) |
| OKLCH | oklch(48% 0.019 329) |
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 #645A63 | 6.59:1 | AA | Lc -87.7 | Fine for body text |
| Black text on #645A63 | 3.18:1 | AA large text | Lc 21.4 | Dividers and decoration only |
| #645A63 text on white | 6.59:1 | AA | Lc 82.6 | Fine for body text |
| #645A63 text on black | 3.18:1 | AA large text | Lc -19.3 | 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
#A69DA5
oklch(70.6% 0.015 329.2)
-
Step 500
500
#90868F
oklch(63.2% 0.018 328.9)
-
Step 600
600
#7A6F79
oklch(55.5% 0.02 328.7)
-
Step 700
700 (this color)
#645A63
oklch(48% 0.019 329)
-
Step 800
800
#544C53
oklch(42.7% 0.015 329.8)
-
Step 900
900
#453F45
oklch(37.6% 0.013 325.8)
-
Step 950
950
#292528
oklch(27% 0.008 334.4)
#645A63 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) | #5A5C63 | 0.016 |
| Deuteranopia (no green cones) | #5C5D63 | 0.015 |
| Tritanopia (no blue cones) | #655B5D | 0.011 |
| Achromatopsia (no color) | #5D5D5D | 0.019 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645A63
#645A63
oklch(48% 0.019 329)
- #576158
#576158
oklch(48.1% 0.019 148.1)
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 #645A63, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.041
- Dusty Grape #545775 ΔE 0.041
- Dim Gray #696969 ΔE 0.045
- YInMn Blue #415A77 ΔE 0.059
- Dusk #4E5481 ΔE 0.067
- Brownish Purple #76424E ΔE 0.069
- Dark Mauve #874C62 ΔE 0.069
- Dull Purple #84597E ΔE 0.072
Use #645A63 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.