#645B8D
Closest named color: Dusky Blue (#475F94). oklch(50.1% 0.079 291.5), rgb(100, 91, 141).
Aa
White text reads best on this color (6.13:1).
About this color
#645B8D is a medium-dark, moderately saturated purple. In OKLCH its lightness is 50%, its chroma 0.079 and its hue 292°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.042 away. White text reads best on it, at 6.13:1.
| Hue family | Purples |
| Lightness | medium-dark (50%) |
| Chroma | moderately saturated (0.079) |
| Temperature | in between |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.42:1 |
| White text | 6.13:1 |
Values
| HEX | #645B8D |
| RGB | rgb(100, 91, 141) |
| HSL | hsl(251, 22%, 45%) |
| OKLCH | oklch(50.1% 0.079 291.5) |
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 #645B8D | 6.13:1 | AA | Lc -85.7 | Fine for body text |
| Black text on #645B8D | 3.42:1 | AA large text | Lc 23.5 | Dividers and decoration only |
| #645B8D text on white | 6.13:1 | AA | Lc 80.6 | Fine for body text |
| #645B8D text on black | 3.42:1 | AA large text | Lc -21.3 | 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
#EAE9F1
oklch(93.7% 0.011 291.9)
-
Step 200
200
#D9D7E6
oklch(88.5% 0.021 292.1)
-
Step 300
300
#C0BDD8
oklch(80.9% 0.038 290.6)
-
Step 400
400
#A09AC4
oklch(70.6% 0.061 291.3)
-
Step 500
500
#8A81B5
oklch(63.1% 0.078 292)
-
Step 600
600
#746AA1
oklch(55.6% 0.085 291.7)
-
Step 700
700 (this color)
#645B8D
oklch(50.1% 0.079 291.5)
-
Step 800
800
#4F4870
oklch(42.6% 0.066 291.4)
-
Step 900
900
#423D5B
oklch(37.8% 0.051 291.4)
-
Step 950
950
#262435
oklch(27% 0.031 289.5)
#645B8D 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) | #4D628F | 0.036 |
| Deuteranopia (no green cones) | #4E618C | 0.035 |
| Tritanopia (no blue cones) | #5B646D | 0.067 |
| Achromatopsia (no color) | #626262 | 0.079 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #645B8D
#645B8D
oklch(50.1% 0.079 291.5)
- #65682F
#65682F
oklch(50.1% 0.079 111.6)
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 #645B8D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.042
- Dusk #4E5481 ΔE 0.045
- Twilight #4E518B ΔE 0.047
- Dusty Grape #545775 ΔE 0.048
- Muted Purple #805B87 ΔE 0.048
- Dusty Purple #825F87 ΔE 0.054
- Denim Blue #3B5B92 ΔE 0.057
- Denim #3B638C ΔE 0.057
Use #645B8D 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.