#663FA0
Closest named color: Rebecca Purple (#663399). oklch(46.3% 0.151 298.9), rgb(102, 63, 160).
Aa
White text reads best on this color (7.54:1).
About this color
#663FA0 is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.151 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 0.027 away. White text reads best on it, at 7.54:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.151) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.78:1 |
| White text | 7.54:1 |
Values
| HEX | #663FA0 |
| RGB | rgb(102, 63, 160) |
| HSL | hsl(264, 43%, 44%) |
| OKLCH | oklch(46.3% 0.151 298.9) |
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 #663FA0 | 7.54:1 | AAA | Lc -90.7 | Preferred for body text |
| Black text on #663FA0 | 2.78:1 | Fails | Lc 18.2 | Dividers and decoration only |
| #663FA0 text on white | 7.54:1 | AAA | Lc 85.8 | Fine for body text |
| #663FA0 text on black | 2.78:1 | Fails | Lc -16.2 | 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 700.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE7F6
oklch(93.5% 0.021 298.2)
-
Step 200
200
#DCD4F1
oklch(88.5% 0.04 298.2)
-
Step 300
300
#C7B7EA
oklch(81% 0.073 299.1)
-
Step 400
400
#AB90DF
oklch(70.8% 0.116 299.1)
-
Step 500
500
#9772D6
oklch(63.1% 0.149 299.2)
-
Step 600
600
#8258C4
oklch(55.6% 0.163 299)
-
Step 700
700 (this color)
#663FA0
oklch(46.3% 0.151 298.9)
-
Step 800
800
#593B89
oklch(42.6% 0.126 298.7)
-
Step 900
900
#49346E
oklch(37.8% 0.097 298.3)
-
Step 950
950
#2B1F40
oklch(27.1% 0.061 299.1)
#663FA0 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) | #0254A3 | 0.113 |
| Deuteranopia (no green cones) | #1C539E | 0.103 |
| Tritanopia (no blue cones) | #595469 | 0.117 |
| Achromatopsia (no color) | #545454 | 0.152 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663FA0
#663FA0
oklch(46.3% 0.151 298.9)
- #536100
#536100
oklch(46.4% 0.109 119)
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 #663FA0, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.027
- Blueberry #464196 ΔE 0.057
- Bluey Purple #6241C7 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.063
- Twilight #4E518B ΔE 0.070
- Blue With A Hint Of Purple #533CC6 ΔE 0.071
- Iris #6258C4 ΔE 0.078
- Blurple #5539CC ΔE 0.079
Use #663FA0 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.