#645BA3
Closest named color: Dusky Blue (#475F94). oklch(51.3% 0.112 287.5), rgb(100, 91, 163).
Aa
White text reads best on this color (5.88:1).
About this color
#645BA3 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 51%, its chroma 0.112 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.050 away. White text reads best on it, at 5.88:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | moderately saturated (0.112) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.56:1 |
| White text | 5.88:1 |
Values
| HEX | #645BA3 |
| RGB | rgb(100, 91, 163) |
| HSL | hsl(248, 28%, 50%) |
| OKLCH | oklch(51.3% 0.112 287.5) |
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 #645BA3 | 5.88:1 | AA | Lc -84.6 | Fine for body text |
| Black text on #645BA3 | 3.56:1 | AA large text | Lc 24.7 | Dividers and decoration only |
| #645BA3 text on white | 5.88:1 | AA | Lc 79.3 | Fine for body text |
| #645BA3 text on black | 3.56:1 | AA large text | Lc -22.5 | 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
#E9E8F4
oklch(93.5% 0.016 289.9)
-
Step 200
200
#D7D7ED
oklch(88.6% 0.03 285.8)
-
Step 300
300
#BEBCE2
oklch(80.9% 0.053 287.6)
-
Step 400
400
#9D98D4
oklch(70.6% 0.087 287.8)
-
Step 500
500
#867EC9
oklch(63.1% 0.111 287.7)
-
Step 600
600
#7066B5
oklch(55.5% 0.12 287.6)
-
Step 700
700 (this color)
#645BA3
oklch(51.3% 0.112 287.5)
-
Step 800
800
#4D467E
oklch(42.8% 0.091 287.6)
-
Step 900
900
#403B66
oklch(37.8% 0.072 287.7)
-
Step 950
950
#25233C
oklch(27.1% 0.046 286.6)
#645BA3 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) | #4266A6 | 0.051 |
| Deuteranopia (no green cones) | #4162A1 | 0.049 |
| Tritanopia (no blue cones) | #536977 | 0.094 |
| Achromatopsia (no color) | #646464 | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645BA3
#645BA3
oklch(51.3% 0.112 287.5)
- #6E6B00
#6E6B00
oklch(51.4% 0.111 107.8)
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 #645BA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.050
- Iris #6258C4 ΔE 0.054
- French Blue #436BAD ΔE 0.056
- Twilight #4E518B ΔE 0.058
- Denim Blue #3B5B92 ΔE 0.064
- Muted Purple #805B87 ΔE 0.064
- Dusk #4E5481 ΔE 0.067
- Slate Blue #6A5ACD ΔE 0.067
Use #645BA3 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.