#645D6B
Closest named color: Slate (#516572). oklch(49% 0.024 307.9), rgb(100, 93, 107).
Aa
White text reads best on this color (6.32:1).
About this color
#645D6B is a medium-dark close to neutral grey. In OKLCH its lightness is 49%, its chroma 0.024. It has too little chroma to lean warm or cool. The nearest named color is Slate (#516572), ΔE 0.033 away. White text reads best on it, at 6.32:1.
| Hue family | Neutrals |
| Lightness | medium-dark (49%) |
| Chroma | close to neutral grey (0.024) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.31:1 |
| White text | 6.32:1 |
Values
| HEX | #645D6B |
| RGB | rgb(100, 93, 107) |
| HSL | hsl(270, 7%, 39%) |
| OKLCH | oklch(49% 0.024 307.9) |
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 #645D6B | 6.32:1 | AA | Lc -86.6 | Fine for body text |
| Black text on #645D6B | 3.31:1 | AA large text | Lc 22.6 | Dividers and decoration only |
| #645D6B text on white | 6.32:1 | AA | Lc 81.5 | Fine for body text |
| #645D6B text on black | 3.31:1 | AA large text | Lc -20.4 | 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
#C2BFC6
oklch(80.9% 0.01 305.4)
-
Step 400
400
#A49EAA
oklch(70.8% 0.018 308.2)
-
Step 500
500
#8D8695
oklch(63.1% 0.024 306.7)
-
Step 600
600
#77707F
oklch(55.7% 0.024 306.6)
-
Step 700
700 (this color)
#645D6B
oklch(49% 0.024 307.9)
-
Step 800
800
#524C57
oklch(42.6% 0.019 309.8)
-
Step 900
900
#444048
oklch(37.8% 0.014 308)
-
Step 950
950
#28252A
oklch(27% 0.01 312.1)
#645D6B 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) | #5B5F6C | 0.014 |
| Deuteranopia (no green cones) | #5C606B | 0.015 |
| Tritanopia (no blue cones) | #635F62 | 0.018 |
| Achromatopsia (no color) | #606060 | 0.024 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645D6B
#645D6B
oklch(49% 0.024 307.9)
- #5C6355
#5C6355
oklch(48.9% 0.023 129)
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 #645D6B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.033
- Dusty Grape #545775 ΔE 0.038
- Dim Gray #696969 ΔE 0.039
- YInMn Blue #415A77 ΔE 0.056
- Dusk #4E5481 ΔE 0.062
- Dull Purple #84597E ΔE 0.066
- Muted Purple #805B87 ΔE 0.068
- Dusty Purple #825F87 ΔE 0.069
Use #645D6B 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.