#663E9C
Closest named color: Rebecca Purple (#663399). oklch(45.9% 0.148 300.3), rgb(102, 62, 156).
Aa
White text reads best on this color (7.68:1).
About this color
#663E9C is a medium-dark, vivid purple. In OKLCH its lightness is 46%, its chroma 0.148 and its hue 300°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.024 away. White text reads best on it, at 7.68:1.
| Hue family | Purples |
| Lightness | medium-dark (46%) |
| Chroma | vivid (0.148) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.73:1 |
| White text | 7.68:1 |
Values
| HEX | #663E9C |
| RGB | rgb(102, 62, 156) |
| HSL | hsl(266, 43%, 43%) |
| OKLCH | oklch(45.9% 0.148 300.3) |
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 #663E9C | 7.68:1 | AAA | Lc -91.1 | Preferred for body text |
| Black text on #663E9C | 2.73:1 | Fails | Lc 17.7 | Dividers and decoration only |
| #663E9C text on white | 7.68:1 | AAA | Lc 86.3 | Fine for body text |
| #663E9C text on black | 2.73:1 | Fails | Lc -15.8 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#ECE6F9
oklch(93.5% 0.026 300.3)
-
Step 200
200
#DED3F5
oklch(88.6% 0.048 300.2)
-
Step 300
300
#C9B4F1
oklch(80.9% 0.087 300.2)
-
Step 400
400
#AF8BE9
oklch(70.7% 0.138 300.6)
-
Step 500
500
#9C6BE2
oklch(63.2% 0.176 300.5)
-
Step 600
600
#874FD0
oklch(55.6% 0.191 300.2)
-
Step 700
700
#733EB4
oklch(49% 0.179 300.5)
-
Step 800
800 (this color)
#663E9C
oklch(45.9% 0.148 300.3)
-
Step 900
900
#4C2F74
oklch(37.6% 0.115 300.4)
-
Step 950
950
#2C1C44
oklch(26.9% 0.073 300)
#663E9C 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) | #09539F | 0.112 |
| Deuteranopia (no green cones) | #20529A | 0.102 |
| Tritanopia (no blue cones) | #5B5267 | 0.113 |
| Achromatopsia (no color) | #535353 | 0.149 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E9C
#663E9C
oklch(45.9% 0.148 300.3)
- #506000
#506000
oklch(45.9% 0.109 120.3)
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 #663E9C, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.024
- Blueberry #464196 ΔE 0.056
- Dark Slate Blue #483D8B ΔE 0.060
- Twilight #4E518B ΔE 0.068
- Bluey Purple #6241C7 ΔE 0.069
- Blue With A Hint Of Purple #533CC6 ΔE 0.077
- Grape #7209B7 ΔE 0.082
- Light Eggplant #894585 ΔE 0.083
Use #663E9C 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.