#663E94
Closest named color: Rebecca Purple (#663399). oklch(45.3% 0.138 302.7), rgb(102, 62, 148).
Aa
White text reads best on this color (7.83:1).
About this color
#663E94 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 45%, its chroma 0.138 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 0.026 away. White text reads best on it, at 7.83:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.138) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.68:1 |
| White text | 7.83:1 |
Values
| HEX | #663E94 |
| RGB | rgb(102, 62, 148) |
| HSL | hsl(268, 41%, 41%) |
| OKLCH | oklch(45.3% 0.138 302.7) |
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 #663E94 | 7.83:1 | AAA | Lc -91.6 | Preferred for body text |
| Black text on #663E94 | 2.68:1 | Fails | Lc 17.2 | Dividers and decoration only |
| #663E94 text on white | 7.83:1 | AAA | Lc 86.8 | Fine for body text |
| #663E94 text on black | 2.68:1 | Fails | Lc -15.2 | 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 800.
-
Step 50
50
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F7
oklch(93.5% 0.024 304.5)
-
Step 200
200
#DFD3F2
oklch(88.6% 0.044 303.1)
-
Step 300
300
#CBB5EC
oklch(81% 0.08 302.9)
-
Step 400
400
#B18CE3
oklch(70.8% 0.129 302.8)
-
Step 500
500
#9E6CDA
oklch(63% 0.165 303)
-
Step 600
600
#8951C8
oklch(55.6% 0.18 302.6)
-
Step 700
700
#7441AD
oklch(49.1% 0.167 302.4)
-
Step 800
800 (this color)
#663E94
oklch(45.3% 0.138 302.7)
-
Step 900
900
#4D3070
oklch(37.7% 0.108 302.4)
-
Step 950
950
#2D1D41
oklch(27% 0.067 302.7)
#663E94 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) | #1A5197 | 0.106 |
| Deuteranopia (no green cones) | #2A5292 | 0.096 |
| Tritanopia (no blue cones) | #5D4F63 | 0.103 |
| Achromatopsia (no color) | #525252 | 0.139 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E94
#663E94
oklch(45.3% 0.138 302.7)
- #4B5F00
#4B5F00
oklch(45.2% 0.111 122.7)
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 #663E94, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.026
- Blueberry #464196 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.056
- Twilight #4E518B ΔE 0.064
- Light Eggplant #894585 ΔE 0.077
- Dusk #4E5481 ΔE 0.078
- Bluey Purple #6241C7 ΔE 0.082
- Blue With A Hint Of Purple #533CC6 ΔE 0.088
Use #663E94 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.