#663A9D
Closest named color: Rebecca Purple (#663399). oklch(45.3% 0.155 300.8), rgb(102, 58, 157).
Aa
White text reads best on this color (7.90:1).
About this color
#663A9D is a medium-dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.155 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.016 away. White text reads best on it, at 7.90:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | vivid (0.155) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.65:1 |
| White text | 7.90:1 |
Values
| HEX | #663A9D |
| RGB | rgb(102, 58, 157) |
| HSL | hsl(267, 46%, 42%) |
| OKLCH | oklch(45.3% 0.155 300.8) |
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 #663A9D | 7.90:1 | AAA | Lc -91.7 | Preferred for body text |
| Black text on #663A9D | 2.65:1 | Fails | Lc 17.0 | Dividers and decoration only |
| #663A9D text on white | 7.90:1 | AAA | Lc 87.0 | Fine for body text |
| #663A9D text on black | 2.65:1 | Fails | Lc -15.1 | 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
#F7F4FD
oklch(97.2% 0.012 301.3)
-
Step 100
100
#ECE6F9
oklch(93.5% 0.026 300.3)
-
Step 200
200
#DED2F6
oklch(88.5% 0.051 300.6)
-
Step 300
300
#CAB3F3
oklch(80.8% 0.092 300.8)
-
Step 400
400
#B089EC
oklch(70.6% 0.145 300.9)
-
Step 500
500
#9E68E6
oklch(63.1% 0.185 301)
-
Step 600
600
#894BD4
oklch(55.6% 0.202 300.8)
-
Step 700
700
#753BB8
oklch(49.2% 0.188 300.9)
-
Step 800
800 (this color)
#663A9D
oklch(45.3% 0.155 300.8)
-
Step 900
900
#4D2D76
oklch(37.6% 0.121 300.9)
-
Step 950
950
#2D1B45
oklch(26.9% 0.077 301.2)
#663A9D 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) | #0051A0 | 0.118 |
| Deuteranopia (no green cones) | #17519B | 0.111 |
| Tritanopia (no blue cones) | #5A4F66 | 0.116 |
| Achromatopsia (no color) | #515151 | 0.156 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A9D
#663A9D
oklch(45.3% 0.155 300.8)
- #4E5E00
#4E5E00
oklch(45.2% 0.108 120.5)
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 #663A9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.016
- Blueberry #464196 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.061
- Bluey Purple #6241C7 ΔE 0.069
- Grape #7209B7 ΔE 0.074
- Blue With A Hint Of Purple #533CC6 ΔE 0.075
- Twilight #4E518B ΔE 0.076
- Chrysanthemum #560BAD ΔE 0.081
Use #663A9D 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.