#663E7E
Closest named color: Rebecca Purple (#663399). oklch(43.9% 0.11 311.5), rgb(102, 62, 126).
Aa
White text reads best on this color (8.21:1).
About this color
#663E7E is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.110 and its hue 311°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.054 away. White text reads best on it, at 8.21:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.110) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.55:1 |
| White text | 8.21:1 |
Values
| HEX | #663E7E |
| RGB | rgb(102, 62, 126) |
| HSL | hsl(278, 34%, 37%) |
| OKLCH | oklch(43.9% 0.11 311.5) |
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 #663E7E | 8.21:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #663E7E | 2.55:1 | Fails | Lc 15.8 | Dividers and decoration only |
| #663E7E text on white | 8.21:1 | AAA | Lc 88.2 | Fine for body text |
| #663E7E text on black | 2.55:1 | Fails | Lc -14.0 | 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
#EEE7F3
oklch(93.7% 0.018 311.6)
-
Step 200
200
#E1D3EB
oklch(88.5% 0.036 311.4)
-
Step 300
300
#CEB5DF
oklch(80.8% 0.064 311.6)
-
Step 400
400
#B68ED0
oklch(70.8% 0.103 311.5)
-
Step 500
500
#A370C3
oklch(63% 0.132 311.4)
-
Step 600
600
#8E57AF
oklch(55.5% 0.142 311.4)
-
Step 700
700
#794797
oklch(49.1% 0.133 311.3)
-
Step 800
800 (this color)
#663E7E
oklch(43.9% 0.11 311.5)
-
Step 900
900
#503362
oklch(37.7% 0.085 311.4)
-
Step 950
950
#2F1E3A
oklch(27% 0.055 311.1)
#663E7E 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) | #2F4D80 | 0.090 |
| Deuteranopia (no green cones) | #3A507C | 0.082 |
| Tritanopia (no blue cones) | #634858 | 0.076 |
| Achromatopsia (no color) | #4F4F4F | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E7E
#663E7E
oklch(43.9% 0.11 311.5)
- #3B5E11
#3B5E11
oklch(43.9% 0.11 131.5)
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 #663E7E, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.054
- Dark Slate Blue #483D8B ΔE 0.059
- Twilight #4E518B ΔE 0.061
- Dusk #4E5481 ΔE 0.068
- Blueberry #464196 ΔE 0.068
- Light Eggplant #894585 ΔE 0.072
- Dusty Grape #545775 ΔE 0.078
- Brownish Purple #76424E ΔE 0.090
Use #663E7E 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.