#645FA4
Closest named color: Dusky Blue (#475F94). oklch(52.1% 0.107 285.4), rgb(100, 95, 164).
Aa
White text reads best on this color (5.65:1).
About this color
#645FA4 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.107 and its hue 285°. 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 5.65:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.107) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.71:1 |
| White text | 5.65:1 |
Values
| HEX | #645FA4 |
| RGB | rgb(100, 95, 164) |
| HSL | hsl(244, 27%, 51%) |
| OKLCH | oklch(52.1% 0.107 285.4) |
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 #645FA4 | 5.65:1 | AA | Lc -83.4 | Fine for body text |
| Black text on #645FA4 | 3.71:1 | AA large text | Lc 25.9 | Dividers and decoration only |
| #645FA4 text on white | 5.65:1 | AA | Lc 78.2 | Fine for body text |
| #645FA4 text on black | 3.71:1 | AA large text | Lc -23.6 | 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
#E8E9F4
oklch(93.6% 0.015 281.9)
-
Step 200
200
#D7D7EC
oklch(88.6% 0.029 285.8)
-
Step 300
300
#BDBCE1
oklch(80.8% 0.052 286.4)
-
Step 400
400
#9B99D3
oklch(70.6% 0.084 285.6)
-
Step 500
500
#8380C7
oklch(63.2% 0.106 284.9)
-
Step 600
600
#6D68B3
oklch(55.5% 0.114 285.1)
-
Step 700
700 (this color)
#645FA4
oklch(52.1% 0.107 285.4)
-
Step 800
800
#4B477D
oklch(42.8% 0.088 285.4)
-
Step 900
900
#3E3C65
oklch(37.8% 0.069 284.8)
-
Step 950
950
#24233B
oklch(26.9% 0.044 284.9)
#645FA4 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) | #4769A7 | 0.044 |
| Deuteranopia (no green cones) | #4665A2 | 0.042 |
| Tritanopia (no blue cones) | #526C79 | 0.091 |
| Achromatopsia (no color) | #676767 | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645FA4
#645FA4
oklch(52.1% 0.107 285.4)
- #736C0C
#736C0C
oklch(52.1% 0.107 104.9)
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 #645FA4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.050
- French Blue #436BAD ΔE 0.050
- Iris #6258C4 ΔE 0.056
- Muted Purple #805B87 ΔE 0.063
- Twilight #4E518B ΔE 0.064
- Dark Lavender #856798 ΔE 0.064
- Denim Blue #3B5B92 ΔE 0.066
- Dusty Purple #825F87 ΔE 0.067
Use #645FA4 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.