#645E9B
Closest named color: Dusky Blue (#475F94). oklch(51.4% 0.095 287.1), rgb(100, 94, 155).
Aa
White text reads best on this color (5.80:1).
About this color
#645E9B is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.095 and its hue 287°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.043 away. White text reads best on it, at 5.80:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.095) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.61:1 |
| White text | 5.80:1 |
Values
| HEX | #645E9B |
| RGB | rgb(100, 94, 155) |
| HSL | hsl(246, 24%, 49%) |
| OKLCH | oklch(51.4% 0.095 287.1) |
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 #645E9B | 5.80:1 | AA | Lc -84.2 | Fine for body text |
| Black text on #645E9B | 3.61:1 | AA large text | Lc 25.1 | Dividers and decoration only |
| #645E9B text on white | 5.80:1 | AA | Lc 79.0 | Fine for body text |
| #645E9B text on black | 3.61:1 | AA large text | Lc -22.8 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E9F3
oklch(93.7% 0.013 286.1)
-
Step 200
200
#D7D7EA
oklch(88.5% 0.026 285.9)
-
Step 300
300
#BEBDDE
oklch(81% 0.046 286.7)
-
Step 400
400
#9D9ACD
oklch(70.7% 0.074 287)
-
Step 500
500
#8680C0
oklch(63.1% 0.095 287.6)
-
Step 600
600
#7069AC
oklch(55.6% 0.102 287.4)
-
Step 700
700 (this color)
#645E9B
oklch(51.4% 0.095 287.1)
-
Step 800
800
#4C4878
oklch(42.8% 0.078 286.4)
-
Step 900
900
#3F3C61
oklch(37.6% 0.063 286.7)
-
Step 950
950
#252339
oklch(26.9% 0.041 287.5)
#645E9B 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) | #4B679D | 0.040 |
| Deuteranopia (no green cones) | #4A649A | 0.038 |
| Tritanopia (no blue cones) | #566975 | 0.080 |
| Achromatopsia (no color) | #656565 | 0.095 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645E9B
#645E9B
oklch(51.4% 0.095 287.1)
- #6E6B20
#6E6B20
oklch(51.5% 0.095 107.1)
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 #645E9B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.043
- Muted Purple #805B87 ΔE 0.054
- French Blue #436BAD ΔE 0.055
- Twilight #4E518B ΔE 0.056
- Dusty Purple #825F87 ΔE 0.059
- Dusk #4E5481 ΔE 0.060
- Denim Blue #3B5B92 ΔE 0.060
- Dark Lavender #856798 ΔE 0.062
Use #645E9B 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.