#663E79
Closest named color: Rebecca Purple (#663399). oklch(43.6% 0.104 314), rgb(102, 62, 121).
Aa
White text reads best on this color (8.30:1).
About this color
#663E79 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.104 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 0.062 away. White text reads best on it, at 8.30:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.104) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.53:1 |
| White text | 8.30:1 |
Values
| HEX | #663E79 |
| RGB | rgb(102, 62, 121) |
| HSL | hsl(281, 32%, 36%) |
| OKLCH | oklch(43.6% 0.104 314) |
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 #663E79 | 8.30:1 | AAA | Lc -93.1 | Preferred for body text |
| Black text on #663E79 | 2.53:1 | Fails | Lc 15.6 | Dividers and decoration only |
| #663E79 text on white | 8.30:1 | AAA | Lc 88.4 | Fine for body text |
| #663E79 text on black | 2.53:1 | Fails | Lc -13.7 | 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
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EEE7F2
oklch(93.7% 0.016 313.6)
-
Step 200
200
#E1D3E9
oklch(88.5% 0.033 313.5)
-
Step 300
300
#CFB6DD
oklch(81% 0.06 313.5)
-
Step 400
400
#B78ECB
oklch(70.7% 0.098 314.4)
-
Step 500
500
#A571BE
oklch(63.1% 0.125 314.2)
-
Step 600
600
#9058AA
oklch(55.6% 0.136 314.2)
-
Step 700
700
#7A4892
oklch(49.1% 0.125 313.8)
-
Step 800
800 (this color)
#663E79
oklch(43.6% 0.104 314)
-
Step 900
900
#51335F
oklch(37.6% 0.081 314.4)
-
Step 950
950
#2F1E38
oklch(26.9% 0.052 313.3)
#663E79 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) | #324C7B | 0.087 |
| Deuteranopia (no green cones) | #3D4F77 | 0.078 |
| Tritanopia (no blue cones) | #654756 | 0.070 |
| Achromatopsia (no color) | #4E4E4E | 0.105 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E79
#663E79
oklch(43.6% 0.104 314)
- #385D1B
#385D1B
oklch(43.5% 0.104 134)
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 #663E79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.062
- Dark Slate Blue #483D8B ΔE 0.063
- Twilight #4E518B ΔE 0.063
- Dusk #4E5481 ΔE 0.067
- Light Eggplant #894585 ΔE 0.073
- Blueberry #464196 ΔE 0.073
- Dusty Grape #545775 ΔE 0.075
- Brownish Purple #76424E ΔE 0.082
Use #663E79 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.