#645A5F
Closest named color: Slate (#516572). oklch(47.9% 0.015 345.9), rgb(100, 90, 95).
Aa
White text reads best on this color (6.62:1).
About this color
#645A5F is a medium-dark close to neutral grey. In OKLCH its lightness is 48%, its chroma 0.015. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.043 away. White text reads best on it, at 6.62:1.
| Hue family | Neutrals |
| Lightness | medium-dark (48%) |
| Chroma | close to neutral grey (0.015) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.16:1 |
| White text | 6.62:1 |
Values
| HEX | #645A5F |
| RGB | rgb(100, 90, 95) |
| HSL | hsl(330, 5%, 37%) |
| OKLCH | oklch(47.9% 0.015 345.9) |
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 #645A5F | 6.62:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #645A5F | 3.16:1 | AA large text | Lc 21.3 | Dividers and decoration only |
| #645A5F text on white | 6.62:1 | AA | Lc 82.8 | Fine for body text |
| #645A5F text on black | 3.16:1 | AA large text | Lc -19.1 | 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
#F6F5F5
oklch(97.1% 0.001 17.2)
-
Step 100
100
#EBE9EA
oklch(93.6% 0.003 345.2)
-
Step 200
200
#DBD8D9
oklch(88.5% 0.004 354.7)
-
Step 300
300
#C4BFC1
oklch(80.9% 0.006 350.8)
-
Step 400
400
#A69EA2
oklch(70.7% 0.011 345.5)
-
Step 500
500
#91868B
oklch(63.1% 0.015 348.2)
-
Step 600
600
#7B7075
oklch(55.7% 0.016 348.3)
-
Step 700
700 (this color)
#645A5F
oklch(47.9% 0.015 345.9)
-
Step 800
800
#544C50
oklch(42.6% 0.012 345.9)
-
Step 900
900
#464043
oklch(37.9% 0.01 345.8)
-
Step 950
950
#292527
oklch(27% 0.007 345.8)
#645A5F 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) | #5B5C5F | 0.015 |
| Deuteranopia (no green cones) | #5D5D5F | 0.014 |
| Tritanopia (no blue cones) | #665A5C | 0.006 |
| Achromatopsia (no color) | #5D5D5D | 0.015 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645A5F
#645A5F
oklch(47.9% 0.015 345.9)
- #56605B
#56605B
oklch(47.9% 0.015 164.3)
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 #645A5F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.043
- Dim Gray #696969 ΔE 0.045
- Dusty Grape #545775 ΔE 0.047
- YInMn Blue #415A77 ΔE 0.062
- Brownish Purple #76424E ΔE 0.068
- Dark Mauve #874C62 ΔE 0.071
- Dusk #4E5481 ΔE 0.072
- Dark Taupe #7F684E ΔE 0.073
Use #645A5F 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.