#663E85
Closest named color: Rebecca Purple (#663399). oklch(44.3% 0.119 308.3), rgb(102, 62, 133).
Aa
White text reads best on this color (8.09:1).
About this color
#663E85 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.119 and its hue 308°. 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 8.09:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.119) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.59:1 |
| White text | 8.09:1 |
Values
| HEX | #663E85 |
| RGB | rgb(102, 62, 133) |
| HSL | hsl(274, 36%, 38%) |
| OKLCH | oklch(44.3% 0.119 308.3) |
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 #663E85 | 8.09:1 | AAA | Lc -92.5 | Preferred for body text |
| Black text on #663E85 | 2.59:1 | Fails | Lc 16.2 | Dividers and decoration only |
| #663E85 text on white | 8.09:1 | AAA | Lc 87.8 | Fine for body text |
| #663E85 text on black | 2.59:1 | Fails | Lc -14.4 | 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
#EEE7F4
oklch(93.7% 0.019 309.8)
-
Step 200
200
#E0D3ED
oklch(88.5% 0.038 308)
-
Step 300
300
#CDB5E4
oklch(80.9% 0.07 308)
-
Step 400
400
#B48DD6
oklch(70.7% 0.112 308.2)
-
Step 500
500
#A26FCB
oklch(63.1% 0.143 308.4)
-
Step 600
600
#8D55B7
oklch(55.5% 0.155 308.6)
-
Step 700
700
#78459E
oklch(49.1% 0.144 308.5)
-
Step 800
800 (this color)
#663E85
oklch(44.3% 0.119 308.3)
-
Step 900
900
#4F3267
oklch(37.7% 0.093 307.8)
-
Step 950
950
#2E1E3C
oklch(27% 0.058 307.5)
#663E85 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) | #2A4E87 | 0.095 |
| Deuteranopia (no green cones) | #365083 | 0.085 |
| Tritanopia (no blue cones) | #624A5B | 0.085 |
| Achromatopsia (no color) | #505050 | 0.119 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E85
#663E85
oklch(44.3% 0.119 308.3)
- #405F00
#405F00
oklch(44.4% 0.117 128.3)
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 #663E85, 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 0.060
- Blueberry #464196 ΔE 0.062
- Dusk #4E5481 ΔE 0.070
- Light Eggplant #894585 ΔE 0.072
- Dusty Grape #545775 ΔE 0.083
- Muted Purple #805B87 ΔE 0.094
Use #663E85 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.