#663D84
Closest named color: Rebecca Purple (#663399). oklch(44.1% 0.119 309), rgb(102, 61, 132).
Aa
White text reads best on this color (8.18:1).
About this color
#663D84 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.119 and its hue 309°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.043 away. White text reads best on it, at 8.18:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.119) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.56:1 |
| White text | 8.18:1 |
Values
| HEX | #663D84 |
| RGB | rgb(102, 61, 132) |
| HSL | hsl(275, 37%, 38%) |
| OKLCH | oklch(44.1% 0.119 309) |
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 #663D84 | 8.18:1 | AAA | Lc -92.7 | Preferred for body text |
| Black text on #663D84 | 2.56:1 | Fails | Lc 16.0 | Dividers and decoration only |
| #663D84 text on white | 8.18:1 | AAA | Lc 88.0 | Fine for body text |
| #663D84 text on black | 2.56:1 | Fails | Lc -14.1 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE6F4
oklch(93.5% 0.021 311.1)
-
Step 200
200
#E1D3ED
oklch(88.6% 0.038 309.6)
-
Step 300
300
#CEB5E3
oklch(80.9% 0.069 309.4)
-
Step 400
400
#B58DD5
oklch(70.7% 0.111 309.2)
-
Step 500
500
#A36FCA
oklch(63.2% 0.142 309.2)
-
Step 600
600
#8E55B7
oklch(55.7% 0.155 309.1)
-
Step 700
700
#78459D
oklch(49.1% 0.143 308.8)
-
Step 800
800 (this color)
#663D84
oklch(44.1% 0.119 309)
-
Step 900
900
#503267
oklch(37.8% 0.093 308.7)
-
Step 950
950
#2F1E3C
oklch(27.1% 0.058 309.1)
#663D84 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) | #294D86 | 0.096 |
| Deuteranopia (no green cones) | #365082 | 0.087 |
| Tritanopia (no blue cones) | #62495A | 0.085 |
| Achromatopsia (no color) | #4F4F4F | 0.120 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663D84
#663D84
oklch(44.1% 0.119 309)
- #3E5E00
#3E5E00
oklch(44% 0.117 128.9)
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 #663D84, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.043
- Dark Slate Blue #483D8B ΔE 0.056
- Twilight #4E518B ΔE 0.062
- Blueberry #464196 ΔE 0.063
- Dusk #4E5481 ΔE 0.071
- Light Eggplant #894585 ΔE 0.072
- Dusty Grape #545775 ΔE 0.084
- Purple #800080 ΔE 0.092
Use #663D84 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.