#645D9E
Closest named color: Dusky Blue (#475F94). oklch(51.4% 0.101 287.2), rgb(100, 93, 158).
Aa
White text reads best on this color (5.83:1).
About this color
#645D9E is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.101 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.045 away. White text reads best on it, at 5.83:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.101) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.60:1 |
| White text | 5.83:1 |
Values
| HEX | #645D9E |
| RGB | rgb(100, 93, 158) |
| HSL | hsl(246, 26%, 49%) |
| OKLCH | oklch(51.4% 0.101 287.2) |
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 #645D9E | 5.83:1 | AA | Lc -84.3 | Fine for body text |
| Black text on #645D9E | 3.60:1 | AA large text | Lc 25.0 | Dividers and decoration only |
| #645D9E text on white | 5.83:1 | AA | Lc 79.1 | Fine for body text |
| #645D9E text on black | 3.60:1 | AA large text | Lc -22.7 | 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
#F5F5FA
oklch(97.2% 0.007 286.3)
-
Step 100
100
#E9E9F3
oklch(93.7% 0.013 286.1)
-
Step 200
200
#D7D7EB
oklch(88.5% 0.027 285.8)
-
Step 300
300
#BEBCDF
oklch(80.8% 0.049 287.9)
-
Step 400
400
#9D99CF
oklch(70.6% 0.078 287.6)
-
Step 500
500
#8680C3
oklch(63.2% 0.1 287.3)
-
Step 600
600
#7068AF
oklch(55.6% 0.108 287.5)
-
Step 700
700 (this color)
#645D9E
oklch(51.4% 0.101 287.2)
-
Step 800
800
#4C477A
oklch(42.7% 0.083 286.8)
-
Step 900
900
#3F3C62
oklch(37.7% 0.064 286.5)
-
Step 950
950
#25233A
oklch(27% 0.042 287.2)
#645D9E 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) | #4867A0 | 0.044 |
| Deuteranopia (no green cones) | #47639C | 0.042 |
| Tritanopia (no blue cones) | #556976 | 0.085 |
| Achromatopsia (no color) | #656565 | 0.101 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645D9E
#645D9E
oklch(51.4% 0.101 287.2)
- #6E6B17
#6E6B17
oklch(51.5% 0.101 107.4)
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 #645D9E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.045
- French Blue #436BAD ΔE 0.055
- Twilight #4E518B ΔE 0.056
- Muted Purple #805B87 ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.061
- Dusk #4E5481 ΔE 0.062
- Dusty Purple #825F87 ΔE 0.063
- Iris #6258C4 ΔE 0.064
Use #645D9E 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.