#645E8B
Closest named color: Dusky Blue (#475F94). oklch(50.6% 0.071 289.7), rgb(100, 94, 139).
Aa
White text reads best on this color (5.97:1).
About this color
#645E8B is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.071 and its hue 290°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.042 away. White text reads best on it, at 5.97:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.071) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.51:1 |
| White text | 5.97:1 |
Values
| HEX | #645E8B |
| RGB | rgb(100, 94, 139) |
| HSL | hsl(248, 19%, 46%) |
| OKLCH | oklch(50.6% 0.071 289.7) |
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 #645E8B | 5.97:1 | AA | Lc -85.0 | Fine for body text |
| Black text on #645E8B | 3.51:1 | AA large text | Lc 24.2 | Dividers and decoration only |
| #645E8B text on white | 5.97:1 | AA | Lc 79.8 | Fine for body text |
| #645E8B text on black | 3.51:1 | AA large text | Lc -22.0 | 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
#F5F5F8
oklch(97.1% 0.004 286.3)
-
Step 100
100
#E9E9F0
oklch(93.6% 0.009 286.2)
-
Step 200
200
#D8D7E5
oklch(88.4% 0.019 289.3)
-
Step 300
300
#C0BDD6
oklch(80.9% 0.035 291.1)
-
Step 400
400
#9F9BC1
oklch(70.6% 0.055 289.7)
-
Step 500
500
#8883B2
oklch(63.2% 0.07 289.1)
-
Step 600
600
#726C9D
oklch(55.6% 0.075 289.3)
-
Step 700
700 (this color)
#645E8B
oklch(50.6% 0.071 289.7)
-
Step 800
800
#4E496D
oklch(42.6% 0.059 290)
-
Step 900
900
#413E58
oklch(37.8% 0.044 289.4)
-
Step 950
950
#262434
oklch(27% 0.03 290)
#645E8B 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) | #52648D | 0.029 |
| Deuteranopia (no green cones) | #52628A | 0.028 |
| Tritanopia (no blue cones) | #5B666E | 0.061 |
| Achromatopsia (no color) | #636363 | 0.071 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645E8B
#645E8B
oklch(50.6% 0.071 289.7)
- #676937
#676937
oklch(50.7% 0.071 110.7)
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 #645E8B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.042
- Muted Purple #805B87 ΔE 0.046
- Dusty Grape #545775 ΔE 0.047
- Dusk #4E5481 ΔE 0.048
- Dusty Purple #825F87 ΔE 0.051
- Twilight #4E518B ΔE 0.053
- Denim #3B638C ΔE 0.055
- Dull Purple #84597E ΔE 0.056
Use #645E8B 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.