#663B7B
Closest named color: Rebecca Purple (#663399). oklch(43.2% 0.112 313.6), rgb(102, 59, 123).
Aa
White text reads best on this color (8.47:1).
About this color
#663B7B is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.112 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 0.055 away. White text reads best on it, at 8.47:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.112) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.47:1 |
| White text | 8.47:1 |
Values
| HEX | #663B7B |
| RGB | rgb(102, 59, 123) |
| HSL | hsl(280, 35%, 36%) |
| OKLCH | oklch(43.2% 0.112 313.6) |
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 #663B7B | 8.47:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #663B7B | 2.47:1 | Fails | Lc 15.1 | Dividers and decoration only |
| #663B7B text on white | 8.47:1 | AAA | Lc 88.9 | Fine for body text |
| #663B7B text on black | 2.47:1 | Fails | Lc -13.3 | 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
#F8F4FA
oklch(97.2% 0.009 314.8)
-
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
#D0B5DF
oklch(81% 0.065 313.5)
-
Step 400
400
#B88DCF
oklch(70.7% 0.105 313.4)
-
Step 500
500
#A66FC2
oklch(63.1% 0.134 313.5)
-
Step 600
600
#9156AE
oklch(55.6% 0.144 313.5)
-
Step 700
700
#7B4596
oklch(49% 0.136 313.2)
-
Step 800
800 (this color)
#663B7B
oklch(43.2% 0.112 313.6)
-
Step 900
900
#523262
oklch(37.7% 0.087 313.6)
-
Step 950
950
#301E39
oklch(27.1% 0.054 313.8)
#663B7B 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) | #2C4A7D | 0.095 |
| Deuteranopia (no green cones) | #394E79 | 0.086 |
| Tritanopia (no blue cones) | #644555 | 0.076 |
| Achromatopsia (no color) | #4D4D4D | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B7B
#663B7B
oklch(43.2% 0.112 313.6)
- #365D11
#365D11
oklch(43.3% 0.112 133.4)
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 #663B7B, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.055
- Dark Slate Blue #483D8B ΔE 0.061
- Twilight #4E518B ΔE 0.068
- Blueberry #464196 ΔE 0.072
- Dusk #4E5481 ΔE 0.074
- Light Eggplant #894585 ΔE 0.075
- Dusty Grape #545775 ΔE 0.083
- Brownish Purple #76424E ΔE 0.089
Use #663B7B 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.