#663BAB
Closest named color: Rebecca Purple (#663399). oklch(46.5% 0.171 296.9), rgb(102, 59, 171).
Aa
White text reads best on this color (7.55:1).
About this color
#663BAB is a medium-dark, vivid purple. In OKLCH its lightness is 47%, its chroma 0.171 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.033 away. White text reads best on it, at 7.55:1.
| Hue family | Purples |
| Lightness | medium-dark (47%) |
| Chroma | vivid (0.171) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.77:1 |
| White text | 7.55:1 |
Values
| HEX | #663BAB |
| RGB | rgb(102, 59, 171) |
| HSL | hsl(263, 49%, 45%) |
| OKLCH | oklch(46.5% 0.171 296.9) |
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 #663BAB | 7.55:1 | AAA | Lc -90.6 | Preferred for body text |
| Black text on #663BAB | 2.77:1 | Fails | Lc 18.3 | Dividers and decoration only |
| #663BAB text on white | 7.55:1 | AAA | Lc 85.7 | Fine for body text |
| #663BAB text on black | 2.77:1 | Fails | Lc -16.3 | 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
#F6F4FC
oklch(97.1% 0.011 297.6)
-
Step 100
100
#EBE7F8
oklch(93.6% 0.023 296.7)
-
Step 200
200
#DCD3F5
oklch(88.5% 0.047 297.5)
-
Step 300
300
#C6B6F0
oklch(80.9% 0.082 297.2)
-
Step 400
400
#A98EE9
oklch(70.7% 0.132 296.5)
-
Step 500
500
#966FE2
oklch(63.2% 0.169 297)
-
Step 600
600
#8154CF
oklch(55.6% 0.182 296.9)
-
Step 700
700 (this color)
#663BAB
oklch(46.5% 0.171 296.9)
-
Step 800
800
#593891
oklch(42.7% 0.141 297.1)
-
Step 900
900
#493274
oklch(37.8% 0.109 296.9)
-
Step 950
950
#2A1E44
oklch(27% 0.069 296)
#663BAB 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) | #0055AE | 0.115 |
| Deuteranopia (no green cones) | #0053A9 | 0.115 |
| Tritanopia (no blue cones) | #55556E | 0.131 |
| Achromatopsia (no color) | #545454 | 0.172 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663BAB
#663BAB
oklch(46.5% 0.171 296.9)
- #566000
#566000
oklch(46.4% 0.107 116.6)
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 #663BAB, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.033
- Bluey Purple #6241C7 ΔE 0.047
- Blue With A Hint Of Purple #533CC6 ΔE 0.056
- Blurple #5539CC ΔE 0.062
- Blueberry #464196 ΔE 0.065
- Grape #7209B7 ΔE 0.065
- Purple Blue #5D21D0 ΔE 0.073
- Iris #6258C4 ΔE 0.074
Use #663BAB 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.