#645A97
Closest named color: Dusky Blue (#475F94). oklch(50.4% 0.096 290.1), rgb(100, 90, 151).
Aa
White text reads best on this color (6.08:1).
About this color
#645A97 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 50%, its chroma 0.096 and its hue 290°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.043 away. White text reads best on it, at 6.08:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.096) |
| Temperature | in between |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.45:1 |
| White text | 6.08:1 |
Values
| HEX | #645A97 |
| RGB | rgb(100, 90, 151) |
| HSL | hsl(250, 25%, 47%) |
| OKLCH | oklch(50.4% 0.096 290.1) |
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 #645A97 | 6.08:1 | AA | Lc -85.5 | Fine for body text |
| Black text on #645A97 | 3.45:1 | AA large text | Lc 23.7 | Dividers and decoration only |
| #645A97 text on white | 6.08:1 | AA | Lc 80.3 | Fine for body text |
| #645A97 text on black | 3.45:1 | AA large text | Lc -21.5 | 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
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E8F2
oklch(93.5% 0.013 290.7)
-
Step 200
200
#D8D7E9
oklch(88.5% 0.025 288.4)
-
Step 300
300
#C0BCDD
oklch(80.9% 0.046 290.9)
-
Step 400
400
#9F99CC
oklch(70.6% 0.074 289.8)
-
Step 500
500
#897FBF
oklch(63.1% 0.095 290.6)
-
Step 600
600
#7368AB
oklch(55.6% 0.103 290.2)
-
Step 700
700 (this color)
#645A97
oklch(50.4% 0.096 290.1)
-
Step 800
800
#4F4777
oklch(42.8% 0.078 290.3)
-
Step 900
900
#413C60
oklch(37.8% 0.061 289.5)
-
Step 950
950
#262338
oklch(27% 0.039 290.1)
#645A97 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) | #476399 | 0.045 |
| Deuteranopia (no green cones) | #486195 | 0.043 |
| Tritanopia (no blue cones) | #586571 | 0.080 |
| Achromatopsia (no color) | #626262 | 0.096 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645A97
#645A97
oklch(50.4% 0.096 290.1)
- #68691E
#68691E
oklch(50.5% 0.095 110.1)
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 #645A97, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.043
- Twilight #4E518B ΔE 0.047
- Dusk #4E5481 ΔE 0.052
- Muted Purple #805B87 ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.058
- Dusty Purple #825F87 ΔE 0.061
- Dusty Grape #545775 ΔE 0.061
- French Blue #436BAD ΔE 0.063
Use #645A97 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.