#663F83
Closest named color: Rebecca Purple (#663399). oklch(44.4% 0.115 308.9), rgb(102, 63, 131).
Aa
White text reads best on this color (8.06:1).
About this color
#663F83 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.115 and its hue 309°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.048 away. White text reads best on it, at 8.06:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.115) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.60:1 |
| White text | 8.06:1 |
Values
| HEX | #663F83 |
| RGB | rgb(102, 63, 131) |
| HSL | hsl(274, 35%, 38%) |
| OKLCH | oklch(44.4% 0.115 308.9) |
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 #663F83 | 8.06:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #663F83 | 2.60:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #663F83 text on white | 8.06:1 | AAA | Lc 87.7 | Fine for body text |
| #663F83 text on black | 2.60:1 | Fails | Lc -14.4 | 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
#F7F4FA
oklch(97.1% 0.009 308.4)
-
Step 100
100
#EEE7F4
oklch(93.7% 0.019 309.8)
-
Step 200
200
#E0D3EC
oklch(88.5% 0.037 308.8)
-
Step 300
300
#CDB5E2
oklch(80.8% 0.067 309)
-
Step 400
400
#B48ED3
oklch(70.7% 0.106 309)
-
Step 500
500
#A270C8
oklch(63.1% 0.138 309.1)
-
Step 600
600
#8D57B4
oklch(55.7% 0.148 309.2)
-
Step 700
700
#77469B
oklch(49% 0.138 308.8)
-
Step 800
800 (this color)
#663F83
oklch(44.4% 0.115 308.9)
-
Step 900
900
#4F3365
oklch(37.7% 0.088 308.6)
-
Step 950
950
#2E1E3B
oklch(26.9% 0.056 308.5)
#663F83 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) | #2D4E85 | 0.091 |
| Deuteranopia (no green cones) | #385181 | 0.083 |
| Tritanopia (no blue cones) | #624A5B | 0.080 |
| Achromatopsia (no color) | #505050 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663F83
#663F83
oklch(44.4% 0.115 308.9)
- #3F5F06
#3F5F06
oklch(44.4% 0.115 129.2)
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 #663F83, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.048
- Dark Slate Blue #483D8B ΔE 0.057
- Twilight #4E518B ΔE 0.058
- Blueberry #464196 ΔE 0.064
- Dusk #4E5481 ΔE 0.067
- Light Eggplant #894585 ΔE 0.070
- Dusty Grape #545775 ΔE 0.079
- Muted Purple #805B87 ΔE 0.091
Use #663F83 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.