#663A75
Closest named color: Rebecca Purple (#663399). oklch(42.7% 0.106 317), rgb(102, 58, 117).
Aa
White text reads best on this color (8.65:1).
About this color
#663A75 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.106 and its hue 317°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.064 away. White text reads best on it, at 8.65:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.106) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.42:1 |
| White text | 8.65:1 |
Values
| HEX | #663A75 |
| RGB | rgb(102, 58, 117) |
| HSL | hsl(285, 34%, 34%) |
| OKLCH | oklch(42.7% 0.106 317) |
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 #663A75 | 8.65:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #663A75 | 2.42:1 | Fails | Lc 14.5 | Not readable |
| #663A75 text on white | 8.65:1 | AAA | Lc 89.4 | Fine for body text |
| #663A75 text on black | 2.42:1 | Fails | Lc -12.8 | 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
#EFE6F2
oklch(93.5% 0.019 317.7)
-
Step 200
200
#E3D3E9
oklch(88.6% 0.034 316.9)
-
Step 300
300
#D1B5DC
oklch(80.9% 0.062 316.4)
-
Step 400
400
#BA8DCA
oklch(70.7% 0.1 317)
-
Step 500
500
#A86FBC
oklch(63% 0.128 316.9)
-
Step 600
600
#9356A8
oklch(55.6% 0.138 316.9)
-
Step 700
700
#7D4690
oklch(49.1% 0.128 316.9)
-
Step 800
800 (this color)
#663A75
oklch(42.7% 0.106 317)
-
Step 900
900
#53325E
oklch(37.6% 0.083 317.3)
-
Step 950
950
#311E37
oklch(27.1% 0.052 317.8)
#663A75 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) | #2F4977 | 0.093 |
| Deuteranopia (no green cones) | #3C4D73 | 0.084 |
| Tritanopia (no blue cones) | #664252 | 0.068 |
| Achromatopsia (no color) | #4C4C4C | 0.107 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A75
#663A75
oklch(42.7% 0.106 317)
- #305C1B
#305C1B
oklch(42.8% 0.107 137.2)
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 #663A75, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.064
- Dark Slate Blue #483D8B ΔE 0.066
- Twilight #4E518B ΔE 0.073
- Dusk #4E5481 ΔE 0.076
- Blueberry #464196 ΔE 0.078
- Light Eggplant #894585 ΔE 0.078
- Brownish Purple #76424E ΔE 0.082
- Dusty Grape #545775 ΔE 0.083
Use #663A75 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.