#663996
Closest named color: Rebecca Purple (#663399). oklch(44.7% 0.148 303.2), rgb(102, 57, 150).
Aa
White text reads best on this color (8.10:1).
About this color
#663996 is a dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.148 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.014 away. White text reads best on it, at 8.10:1.
| Hue family | Purples |
| Lightness | dark (45%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.59:1 |
| White text | 8.10:1 |
Values
| HEX | #663996 |
| RGB | rgb(102, 57, 150) |
| HSL | hsl(269, 45%, 41%) |
| OKLCH | oklch(44.7% 0.148 303.2) |
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 #663996 | 8.10:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #663996 | 2.59:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #663996 text on white | 8.10:1 | AAA | Lc 87.6 | Fine for body text |
| #663996 text on black | 2.59:1 | Fails | Lc -14.5 | Not readable |
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 800.
-
Step 50
50
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F8
oklch(93.6% 0.025 303.5)
-
Step 200
200
#DFD2F4
oklch(88.5% 0.048 302.8)
-
Step 300
300
#CCB3EF
oklch(80.8% 0.087 303.5)
-
Step 400
400
#B28AE7
oklch(70.7% 0.138 302.9)
-
Step 500
500
#A069E0
oklch(63.1% 0.177 303)
-
Step 600
600
#8C4DCD
oklch(55.7% 0.192 303.4)
-
Step 700
700
#773DB2
oklch(49.2% 0.179 303.2)
-
Step 800
800 (this color)
#663996
oklch(44.7% 0.148 303.2)
-
Step 900
900
#4F2E73
oklch(37.8% 0.116 303.4)
-
Step 950
950
#2E1C43
oklch(27% 0.072 303.2)
#663996 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) | #034F99 | 0.119 |
| Deuteranopia (no green cones) | #204F94 | 0.107 |
| Tritanopia (no blue cones) | #5D4C62 | 0.109 |
| Achromatopsia (no color) | #505050 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663996
#663996
oklch(44.7% 0.148 303.2)
- #495D00
#495D00
oklch(44.5% 0.109 122.9)
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 #663996, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.014
- Dark Slate Blue #483D8B ΔE 0.057
- Blueberry #464196 ΔE 0.057
- Twilight #4E518B ΔE 0.074
- Bluey Purple #6241C7 ΔE 0.080
- Grape #7209B7 ΔE 0.080
- Light Eggplant #894585 ΔE 0.084
- Chrysanthemum #560BAD ΔE 0.085
Use #663996 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.