#645688
Closest named color: Dusk (#4E5481). oklch(48.8% 0.08 296.2), rgb(100, 86, 136).
Aa
White text reads best on this color (6.50:1).
About this color
#645688 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.080 and its hue 296°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.038 away. White text reads best on it, at 6.50:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.080) |
| Temperature | in between |
| Nearest name | Dusk (#4E5481) |
| Black text | 3.22:1 |
| White text | 6.50:1 |
Values
| HEX | #645688 |
| RGB | rgb(100, 86, 136) |
| HSL | hsl(257, 23%, 44%) |
| OKLCH | oklch(48.8% 0.08 296.2) |
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 #645688 | 6.50:1 | AA | Lc -87.3 | Fine for body text |
| Black text on #645688 | 3.22:1 | AA large text | Lc 21.8 | Dividers and decoration only |
| #645688 text on white | 6.50:1 | AA | Lc 82.2 | Fine for body text |
| #645688 text on black | 3.22:1 | AA large text | Lc -19.7 | 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
#F6F5F9
oklch(97.2% 0.005 297.7)
-
Step 100
100
#EAE8F1
oklch(93.5% 0.012 296.3)
-
Step 200
200
#DAD6E6
oklch(88.4% 0.022 297.4)
-
Step 300
300
#C2BCD7
oklch(80.9% 0.038 295.7)
-
Step 400
400
#A499C3
oklch(70.7% 0.062 296.8)
-
Step 500
500
#8E80B4
oklch(63.2% 0.078 296.5)
-
Step 600
600
#7869A0
oklch(55.7% 0.085 296.1)
-
Step 700
700 (this color)
#645688
oklch(48.8% 0.08 296.2)
-
Step 800
800
#52476F
oklch(42.6% 0.066 296.1)
-
Step 900
900
#443C5A
oklch(37.7% 0.051 296.1)
-
Step 950
950
#282335
oklch(27% 0.034 296.8)
#645688 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) | #495E8A | 0.043 |
| Deuteranopia (no green cones) | #4B5D87 | 0.041 |
| Tritanopia (no blue cones) | #5D5E68 | 0.065 |
| Achromatopsia (no color) | #5E5E5E | 0.080 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645688
#645688
oklch(48.8% 0.08 296.2)
- #5D652D
#5D652D
oklch(48.7% 0.079 116.2)
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 #645688, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.038
- Twilight #4E518B ΔE 0.040
- Dusty Grape #545775 ΔE 0.042
- Dusky Blue #475F94 ΔE 0.047
- Muted Purple #805B87 ΔE 0.052
- Denim Blue #3B5B92 ΔE 0.058
- Dull Purple #84597E ΔE 0.059
- Dusty Purple #825F87 ΔE 0.060
Use #645688 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.