#66439B
Closest named color: Rebecca Purple (#663399). oklch(46.6% 0.139 299.3), rgb(102, 67, 155).
Aa
White text reads best on this color (7.39:1).
About this color
#66439B is a medium-dark, moderately saturated purple. In OKLCH its lightness is 47%, its chroma 0.139 and its hue 299°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.035 away. White text reads best on it, at 7.39:1.
| Hue family | Purples |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.139) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.84:1 |
| White text | 7.39:1 |
Values
| HEX | #66439B |
| RGB | rgb(102, 67, 155) |
| HSL | hsl(264, 40%, 44%) |
| OKLCH | oklch(46.6% 0.139 299.3) |
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 #66439B | 7.39:1 | AAA | Lc -90.2 | Preferred for body text |
| Black text on #66439B | 2.84:1 | Fails | Lc 18.6 | Dividers and decoration only |
| #66439B text on white | 7.39:1 | AAA | Lc 85.4 | Fine for body text |
| #66439B text on black | 2.84:1 | Fails | Lc -16.6 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F5
oklch(93.5% 0.019 299.1)
-
Step 200
200
#DCD4EF
oklch(88.5% 0.038 299.2)
-
Step 300
300
#C6B8E7
oklch(81% 0.067 298.5)
-
Step 400
400
#AA91DA
oklch(70.6% 0.108 299.4)
-
Step 500
500
#9674D0
oklch(63.1% 0.138 299.5)
-
Step 600
600
#815BBD
oklch(55.6% 0.149 299.4)
-
Step 700
700 (this color)
#66439B
oklch(46.6% 0.139 299.3)
-
Step 800
800
#593D84
oklch(42.6% 0.116 299.7)
-
Step 900
900
#49356A
oklch(37.7% 0.09 299.5)
-
Step 950
950
#2B1F3E
oklch(27% 0.058 300.4)
#66439B 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) | #1D559E | 0.099 |
| Deuteranopia (no green cones) | #295599 | 0.092 |
| Tritanopia (no blue cones) | #5B5568 | 0.108 |
| Achromatopsia (no color) | #565656 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #66439B
#66439B
oklch(46.6% 0.139 299.3)
- #536200
#536200
oklch(46.7% 0.11 119.5)
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 #66439B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.035
- Blueberry #464196 ΔE 0.056
- Twilight #4E518B ΔE 0.060
- Dark Slate Blue #483D8B ΔE 0.062
- Bluey Purple #6241C7 ΔE 0.071
- Dusk #4E5481 ΔE 0.076
- Light Eggplant #894585 ΔE 0.077
- Iris #6258C4 ΔE 0.078
Use #66439B 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.