#645E73
Closest named color: Slate (#516572). oklch(49.5% 0.034 298.2), rgb(100, 94, 115).
Aa
White text reads best on this color (6.19:1).
About this color
#645E73 is a medium-dark, muted purple. In OKLCH its lightness is 50%, its chroma 0.034 and its hue 298°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Slate (#516572), ΔE 0.034 away. White text reads best on it, at 6.19:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | muted (0.034) |
| Temperature | in between |
| Nearest name | Slate (#516572) |
| Black text | 3.39:1 |
| White text | 6.19:1 |
Values
| HEX | #645E73 |
| RGB | rgb(100, 94, 115) |
| HSL | hsl(257, 10%, 41%) |
| OKLCH | oklch(49.5% 0.034 298.2) |
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 #645E73 | 6.19:1 | AA | Lc -86.1 | Fine for body text |
| Black text on #645E73 | 3.39:1 | AA large text | Lc 23.1 | Dividers and decoration only |
| #645E73 text on white | 6.19:1 | AA | Lc 80.9 | Fine for body text |
| #645E73 text on black | 3.39:1 | AA large text | Lc -21.0 | 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
#F5F5F7
oklch(97.1% 0.003 286.4)
-
Step 100
100
#EAE9ED
oklch(93.6% 0.005 297.7)
-
Step 200
200
#DAD8DE
oklch(88.6% 0.008 301.3)
-
Step 300
300
#C2BECA
oklch(80.8% 0.017 301.2)
-
Step 400
400
#A29DAF
oklch(70.6% 0.026 298.4)
-
Step 500
500
#8C859C
oklch(63.1% 0.035 299.3)
-
Step 600
600
#766F86
oklch(55.6% 0.036 299.1)
-
Step 700
700 (this color)
#645E73
oklch(49.5% 0.034 298.2)
-
Step 800
800
#514C5D
oklch(42.8% 0.028 298.6)
-
Step 900
900
#433F4C
oklch(37.7% 0.022 299.4)
-
Step 950
950
#27252C
oklch(27% 0.013 298.6)
#645E73 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) | #5A6174 | 0.017 |
| Deuteranopia (no green cones) | #5B6172 | 0.016 |
| Tritanopia (no blue cones) | #616165 | 0.028 |
| Achromatopsia (no color) | #616161 | 0.034 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645E73
#645E73
oklch(49.5% 0.034 298.2)
- #60654F
#60654F
oklch(49.6% 0.034 118.1)
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 #645E73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Slate #516572 ΔE 0.034
- Dusty Grape #545775 ΔE 0.035
- Dim Gray #696969 ΔE 0.042
- YInMn Blue #415A77 ΔE 0.054
- Dusk #4E5481 ΔE 0.056
- Dull Purple #84597E ΔE 0.059
- Muted Purple #805B87 ΔE 0.060
- Dusty Purple #825F87 ΔE 0.061
Use #645E73 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.