#645F71
Closest named color: Slate (#516572). oklch(49.7% 0.029 298), rgb(100, 95, 113).
Aa
White text reads best on this color (6.14:1).
About this color
#645F71 is a medium-dark close to neutral grey. In OKLCH its lightness is 50%, its chroma 0.029. 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 6.14:1.
| Hue family | Neutrals |
| Lightness | medium-dark (50%) |
| Chroma | close to neutral grey (0.029) |
| Temperature | neutral |
| Nearest name | Slate (#516572) |
| Black text | 3.41:1 |
| White text | 6.14:1 |
Values
| HEX | #645F71 |
| RGB | rgb(100, 95, 113) |
| HSL | hsl(257, 9%, 41%) |
| OKLCH | oklch(49.7% 0.029 298) |
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 #645F71 | 6.14:1 | AA | Lc -85.8 | Fine for body text |
| Black text on #645F71 | 3.41:1 | AA large text | Lc 23.4 | Dividers and decoration only |
| #645F71 text on white | 6.14:1 | AA | Lc 80.7 | Fine for body text |
| #645F71 text on black | 3.41:1 | AA large text | Lc -21.2 | 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
#F5F5F6
oklch(97% 0.001 286.4)
-
Step 100
100
#EAE9EC
oklch(93.6% 0.004 301.4)
-
Step 200
200
#D9D8DE
oklch(88.5% 0.008 293.9)
-
Step 300
300
#C1BFC9
oklch(80.9% 0.014 295.3)
-
Step 400
400
#A29EAD
oklch(70.7% 0.022 298)
-
Step 500
500
#8B8699
oklch(63.1% 0.029 297.6)
-
Step 600
600
#757084
oklch(55.7% 0.031 296.8)
-
Step 700
700 (this color)
#645F71
oklch(49.7% 0.029 298)
-
Step 800
800
#504C5B
oklch(42.6% 0.025 297.5)
-
Step 900
900
#43404A
oklch(37.8% 0.017 299.3)
-
Step 950
950
#27252C
oklch(27% 0.013 298.6)
#645F71 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) | #5C6272 | 0.014 |
| Deuteranopia (no green cones) | #5C6170 | 0.014 |
| Tritanopia (no blue cones) | #626265 | 0.024 |
| Achromatopsia (no color) | #626262 | 0.029 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645F71
#645F71
oklch(49.7% 0.029 298)
- #606552
#606552
oklch(49.7% 0.03 119.5)
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 #645F71, 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 0.038
- Dusty Grape #545775 ΔE 0.038
- YInMn Blue #415A77 ΔE 0.055
- Dusk #4E5481 ΔE 0.060
- Dull Purple #84597E ΔE 0.062
- Muted Purple #805B87 ΔE 0.062
- Dusty Purple #825F87 ΔE 0.063
Use #645F71 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.