#663371
Closest named color: Rebecca Purple (#663399). oklch(41.4% 0.114 320.3), rgb(102, 51, 113).
Aa
White text reads best on this color (9.22:1).
About this color
#663371 is a dark, moderately saturated purple. In OKLCH its lightness is 41%, its chroma 0.114 and its hue 320°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.066 away. White text reads best on it, at 9.22:1.
| Hue family | Purples |
| Lightness | dark (41%) |
| Chroma | moderately saturated (0.114) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.27:1 |
| White text | 9.22:1 |
Values
| HEX | #663371 |
| RGB | rgb(102, 51, 113) |
| HSL | hsl(289, 38%, 32%) |
| OKLCH | oklch(41.4% 0.114 320.3) |
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 #663371 | 9.22:1 | AAA | Lc -95.3 | Preferred for body text |
| Black text on #663371 | 2.27:1 | Fails | Lc 13.1 | Not readable |
| #663371 text on white | 9.22:1 | AAA | Lc 90.9 | Preferred for body text |
| #663371 text on black | 2.27:1 | Fails | Lc -11.4 | Not readable |
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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#F0E6F2
oklch(93.6% 0.019 320.6)
-
Step 200
200
#E5D2E9
oklch(88.6% 0.037 320.4)
-
Step 300
300
#D4B3DC
oklch(80.8% 0.067 319.6)
-
Step 400
400
#BE8ACA
oklch(70.6% 0.107 319.9)
-
Step 500
500
#AE6CBC
oklch(63.2% 0.136 320.4)
-
Step 600
600
#9952A8
oklch(55.7% 0.148 320.4)
-
Step 700
700
#824290
oklch(49.1% 0.137 320.2)
-
Step 800
800 (this color)
#663371
oklch(41.4% 0.114 320.3)
-
Step 900
900
#56305E
oklch(37.7% 0.089 320.5)
-
Step 950
950
#331D37
oklch(27.1% 0.055 321.3)
#663371 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) | #284473 | 0.106 |
| Deuteranopia (no green cones) | #38496F | 0.094 |
| Tritanopia (no blue cones) | #673C4D | 0.071 |
| Achromatopsia (no color) | #474747 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663371
#663371
oklch(41.4% 0.114 320.3)
- #235A16
#235A16
oklch(41.5% 0.115 140.2)
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 #663371, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.071
- Rich Purple #720058 ΔE 0.080
- Grape Purple #5D1451 ΔE 0.080
- Velvet #750851 ΔE 0.081
- Purple #800080 ΔE 0.082
- Blueberry #464196 ΔE 0.086
- Brownish Purple #76424E ΔE 0.088
Use #663371 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.