#663787
Closest named color: Rebecca Purple (#663399). oklch(43.3% 0.133 309), rgb(102, 55, 135).
Aa
White text reads best on this color (8.53:1).
About this color
#663787 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.133 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 0.032 away. White text reads best on it, at 8.53:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.133) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.46:1 |
| White text | 8.53:1 |
Values
| HEX | #663787 |
| RGB | rgb(102, 55, 135) |
| HSL | hsl(275, 42%, 37%) |
| OKLCH | oklch(43.3% 0.133 309) |
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 #663787 | 8.53:1 | AAA | Lc -93.5 | Preferred for body text |
| Black text on #663787 | 2.46:1 | Fails | Lc 15.0 | Dividers and decoration only |
| #663787 text on white | 8.53:1 | AAA | Lc 89.0 | Fine for body text |
| #663787 text on black | 2.46:1 | Fails | Lc -13.2 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EEE6F6
oklch(93.6% 0.023 308.2)
-
Step 200
200
#E1D2EF
oklch(88.5% 0.042 308.6)
-
Step 300
300
#CFB3E7
oklch(80.8% 0.078 309)
-
Step 400
400
#B78ADB
oklch(70.6% 0.124 309)
-
Step 500
500
#A56BD1
oklch(63.1% 0.158 308.8)
-
Step 600
600
#9150BE
oklch(55.7% 0.172 309.2)
-
Step 700
700
#7B3FA4
oklch(49% 0.161 309)
-
Step 800
800 (this color)
#663787
oklch(43.3% 0.133 309)
-
Step 900
900
#522F6B
oklch(37.7% 0.105 309.2)
-
Step 950
950
#301C3E
oklch(27% 0.066 309.8)
#663787 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) | #1B4A8A | 0.112 |
| Deuteranopia (no green cones) | #2D4D85 | 0.100 |
| Tritanopia (no blue cones) | #614659 | 0.095 |
| Achromatopsia (no color) | #4C4C4C | 0.134 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663787
#663787
oklch(43.3% 0.133 309)
- #3C5C00
#3C5C00
oklch(43.3% 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 #663787, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.032
- Dark Slate Blue #483D8B ΔE 0.055
- Blueberry #464196 ΔE 0.063
- Twilight #4E518B ΔE 0.074
- Light Eggplant #894585 ΔE 0.080
- Purple #800080 ΔE 0.082
- Dusk #4E5481 ΔE 0.085
- Dark Magenta #8B008B ΔE 0.092
Use #663787 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.