#645DA5
Closest named color: Dusky Blue (#475F94). oklch(51.8% 0.112 286.3), rgb(100, 93, 165).
Aa
White text reads best on this color (5.75:1).
About this color
#645DA5 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.112 and its hue 286°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.051 away. White text reads best on it, at 5.75:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.65:1 |
| White text | 5.75:1 |
Values
| HEX | #645DA5 |
| RGB | rgb(100, 93, 165) |
| HSL | hsl(246, 29%, 51%) |
| OKLCH | oklch(51.8% 0.112 286.3) |
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 #645DA5 | 5.75:1 | AA | Lc -83.9 | Fine for body text |
| Black text on #645DA5 | 3.65:1 | AA large text | Lc 25.4 | Dividers and decoration only |
| #645DA5 text on white | 5.75:1 | AA | Lc 78.7 | Fine for body text |
| #645DA5 text on black | 3.65:1 | AA large text | Lc -23.1 | 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
#E9E9F4
oklch(93.7% 0.015 286.1)
-
Step 200
200
#D7D7ED
oklch(88.6% 0.03 285.8)
-
Step 300
300
#BDBCE3
oklch(80.9% 0.055 286.3)
-
Step 400
400
#9C99D4
oklch(70.7% 0.086 286.3)
-
Step 500
500
#847FC9
oklch(63.1% 0.11 285.9)
-
Step 600
600
#6F67B6
oklch(55.7% 0.12 286.4)
-
Step 700
700 (this color)
#645DA5
oklch(51.8% 0.112 286.3)
-
Step 800
800
#4C467F
oklch(42.8% 0.093 286.6)
-
Step 900
900
#3F3B66
oklch(37.7% 0.072 286.6)
-
Step 950
950
#25233C
oklch(27.1% 0.046 286.6)
#645DA5 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) | #4468A8 | 0.048 |
| Deuteranopia (no green cones) | #4264A3 | 0.048 |
| Tritanopia (no blue cones) | #526B79 | 0.094 |
| Achromatopsia (no color) | #666666 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645DA5
#645DA5
oklch(51.8% 0.112 286.3)
- #716C00
#716C00
oklch(51.9% 0.111 106.5)
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 #645DA5, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.051
- Iris #6258C4 ΔE 0.052
- French Blue #436BAD ΔE 0.053
- Twilight #4E518B ΔE 0.062
- Slate Blue #6A5ACD ΔE 0.065
- Muted Purple #805B87 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.066
- Dark Lavender #856798 ΔE 0.068
Use #645DA5 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.