#663A74
Closest named color: Rebecca Purple (#663399). oklch(42.7% 0.105 317.6), rgb(102, 58, 116).
Aa
White text reads best on this color (8.66:1).
About this color
#663A74 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.105 and its hue 318°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.065 away. White text reads best on it, at 8.66:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.105) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.42:1 |
| White text | 8.66:1 |
Values
| HEX | #663A74 |
| RGB | rgb(102, 58, 116) |
| HSL | hsl(286, 33%, 34%) |
| OKLCH | oklch(42.7% 0.105 317.6) |
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 #663A74 | 8.66:1 | AAA | Lc -94.0 | Preferred for body text |
| Black text on #663A74 | 2.42:1 | Fails | Lc 14.5 | Not readable |
| #663A74 text on white | 8.66:1 | AAA | Lc 89.5 | Fine for body text |
| #663A74 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
#E3D3E8
oklch(88.6% 0.033 318.1)
-
Step 300
300
#D1B5DB
oklch(80.9% 0.061 317.1)
-
Step 400
400
#BA8DC9
oklch(70.7% 0.099 317.5)
-
Step 500
500
#A870BB
oklch(63.1% 0.125 317.2)
-
Step 600
600
#9356A7
oklch(55.5% 0.137 317.3)
-
Step 700
700
#7E468F
oklch(49.1% 0.127 317.9)
-
Step 800
800 (this color)
#663A74
oklch(42.7% 0.105 317.6)
-
Step 900
900
#53325E
oklch(37.6% 0.083 317.3)
-
Step 950
950
#311E37
oklch(27.1% 0.052 317.8)
#663A74 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) | #304976 | 0.092 |
| Deuteranopia (no green cones) | #3C4D72 | 0.084 |
| Tritanopia (no blue cones) | #664251 | 0.069 |
| Achromatopsia (no color) | #4B4B4B | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A74
#663A74
oklch(42.7% 0.105 317.6)
- #305C1D
#305C1D
oklch(42.8% 0.105 137.6)
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 #663A74, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.065
- Dark Slate Blue #483D8B ΔE 0.066
- Twilight #4E518B ΔE 0.073
- Dusk #4E5481 ΔE 0.076
- Light Eggplant #894585 ΔE 0.079
- Blueberry #464196 ΔE 0.079
- Brownish Purple #76424E ΔE 0.080
- Dusty Grape #545775 ΔE 0.083
Use #663A74 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.