#646399
Closest named color: Dusky Blue (#475F94). oklch(52.4% 0.084 283.9), rgb(100, 99, 153).
Aa
White text reads best on this color (5.54:1).
About this color
#646399 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 52%, its chroma 0.084 and its hue 284°. Its hue sits on the cool side of the wheel. The nearest named color is Dusky Blue (#475F94), ΔE 0.044 away. White text reads best on it, at 5.54:1.
| Hue family | Purples |
| Lightness | medium-dark (52%) |
| Chroma | moderately saturated (0.084) |
| Temperature | cool |
| Nearest name | Dusky Blue (#475F94) |
| Black text | 3.78:1 |
| White text | 5.54:1 |
Values
| HEX | #646399 |
| RGB | rgb(100, 99, 153) |
| HSL | hsl(241, 21%, 49%) |
| OKLCH | oklch(52.4% 0.084 283.9) |
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 #646399 | 5.54:1 | AA | Lc -83.0 | Fine for body text |
| Black text on #646399 | 3.78:1 | AA large text | Lc 26.4 | Dividers and decoration only |
| #646399 text on white | 5.54:1 | AA | Lc 77.7 | Fine for body text |
| #646399 text on black | 3.78:1 | AA large text | Lc -24.1 | 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 600.
-
Step 50
50
#F5F5F9
oklch(97.1% 0.005 286.3)
-
Step 100
100
#E9E9F1
oklch(93.6% 0.011 286.2)
-
Step 200
200
#D7D8E7
oklch(88.6% 0.02 282.9)
-
Step 300
300
#BDBED9
oklch(80.9% 0.038 283.8)
-
Step 400
400
#9B9CC6
oklch(70.7% 0.061 283.7)
-
Step 500
500
#8383B7
oklch(63% 0.078 283.9)
-
Step 600
600 (this color)
#646399
oklch(52.4% 0.084 283.9)
-
Step 700
700
#5B5A8C
oklch(49% 0.079 284)
-
Step 800
800
#4B4A71
oklch(42.7% 0.064 284.5)
-
Step 900
900
#3E3E5C
oklch(37.7% 0.051 283.7)
-
Step 950
950
#242436
oklch(26.9% 0.033 283.9)
#646399 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) | #536A9B | 0.028 |
| Deuteranopia (no green cones) | #516798 | 0.028 |
| Tritanopia (no blue cones) | #566D77 | 0.073 |
| Achromatopsia (no color) | #686868 | 0.085 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #646399
#646399
oklch(52.4% 0.084 283.9)
- #726C2D
#726C2D
oklch(52.3% 0.084 103.9)
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 #646399, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusky Blue #475F94 ΔE 0.044
- French Blue #436BAD ΔE 0.051
- Muted Purple #805B87 ΔE 0.053
- Dusty Purple #825F87 ΔE 0.054
- Dark Lavender #856798 ΔE 0.055
- Dull Blue #49759C ΔE 0.057
- Muted Blue #3B719F ΔE 0.058
- Metallic Blue #4F738E ΔE 0.059
Use #646399 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.