#663C7A
Closest named color: Rebecca Purple (#663399). oklch(43.4% 0.109 313.9), rgb(102, 60, 122).
Aa
White text reads best on this color (8.42:1).
About this color
#663C7A is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.109 and its hue 314°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.057 away. White text reads best on it, at 8.42:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.109) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.49:1 |
| White text | 8.42:1 |
Values
| HEX | #663C7A |
| RGB | rgb(102, 60, 122) |
| HSL | hsl(281, 34%, 36%) |
| OKLCH | oklch(43.4% 0.109 313.9) |
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 #663C7A | 8.42:1 | AAA | Lc -93.4 | Preferred for body text |
| Black text on #663C7A | 2.49:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #663C7A text on white | 8.42:1 | AAA | Lc 88.8 | Fine for body text |
| #663C7A text on black | 2.49:1 | Fails | Lc -13.4 | 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
#EEE6F3
oklch(93.5% 0.019 312.8)
-
Step 200
200
#E2D3EA
oklch(88.6% 0.035 314.1)
-
Step 300
300
#D0B5DE
oklch(80.9% 0.064 314.1)
-
Step 400
400
#B88DCD
oklch(70.7% 0.102 314.3)
-
Step 500
500
#A670C0
oklch(63.2% 0.13 314.1)
-
Step 600
600
#9157AC
oklch(55.7% 0.14 314.1)
-
Step 700
700
#7B4694
oklch(49.1% 0.132 313.9)
-
Step 800
800 (this color)
#663C7A
oklch(43.4% 0.109 313.9)
-
Step 900
900
#523261
oklch(37.7% 0.086 314.2)
-
Step 950
950
#301E39
oklch(27.1% 0.054 313.8)
#663C7A 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) | #2F4B7C | 0.092 |
| Deuteranopia (no green cones) | #3B4E78 | 0.082 |
| Tritanopia (no blue cones) | #644555 | 0.073 |
| Achromatopsia (no color) | #4D4D4D | 0.109 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663C7A
#663C7A
oklch(43.4% 0.109 313.9)
- #365D16
#365D16
oklch(43.4% 0.109 134.1)
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 #663C7A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.061
- Twilight #4E518B ΔE 0.066
- Dusk #4E5481 ΔE 0.072
- Blueberry #464196 ΔE 0.072
- Light Eggplant #894585 ΔE 0.074
- Dusty Grape #545775 ΔE 0.080
- Brownish Purple #76424E ΔE 0.086
Use #663C7A 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.