#663B66
Closest named color: Brownish Purple (#76424E). oklch(42.1% 0.087 327), rgb(102, 59, 102).
Aa
White text reads best on this color (8.81:1).
About this color
#663B66 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.087 and its hue 327°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Brownish Purple (#76424E), ΔE 0.060 away. White text reads best on it, at 8.81:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.087) |
| Temperature | in between |
| Nearest name | Brownish Purple (#76424E) |
| Black text | 2.38:1 |
| White text | 8.81:1 |
Values
| HEX | #663B66 |
| RGB | rgb(102, 59, 102) |
| HSL | hsl(300, 27%, 32%) |
| OKLCH | oklch(42.1% 0.087 327) |
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 #663B66 | 8.81:1 | AAA | Lc -94.4 | Preferred for body text |
| Black text on #663B66 | 2.38:1 | Fails | Lc 14.0 | Not readable |
| #663B66 text on white | 8.81:1 | AAA | Lc 90.0 | Fine for body text |
| #663B66 text on black | 2.38:1 | Fails | Lc -12.3 | 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
#F8F4F8
oklch(97.1% 0.007 325.6)
-
Step 100
100
#EFE7EF
oklch(93.7% 0.014 325.7)
-
Step 200
200
#E4D3E3
oklch(88.5% 0.028 327.6)
-
Step 300
300
#D3B6D2
oklch(81% 0.05 327.1)
-
Step 400
400
#BC8FBB
oklch(70.7% 0.081 327.1)
-
Step 500
500
#AB72AA
oklch(63.1% 0.105 327.3)
-
Step 600
600
#965A96
oklch(55.7% 0.114 327)
-
Step 700
700
#804980
oklch(49.1% 0.107 327.1)
-
Step 800
800 (this color)
#663B66
oklch(42.1% 0.087 327)
-
Step 900
900
#543454
oklch(37.6% 0.067 326.8)
-
Step 950
950
#321F31
oklch(27.1% 0.042 328.5)
#663B66 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) | #384768 | 0.082 |
| Deuteranopia (no green cones) | #434C65 | 0.074 |
| Tritanopia (no blue cones) | #683F4B | 0.050 |
| Achromatopsia (no color) | #4A4A4A | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B66
#663B66
oklch(42.1% 0.087 327)
- #285A30
#285A30
oklch(42.1% 0.087 147.2)
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 #663B66, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Brownish Purple #76424E ΔE 0.060
- Purple Brown #673A3F ΔE 0.065
- Dusty Grape #545775 ΔE 0.079
- Dusk #4E5481 ΔE 0.079
- Twilight #4E518B ΔE 0.082
- Dark Slate Blue #483D8B ΔE 0.082
- Dark Mauve #874C62 ΔE 0.084
- Light Eggplant #894585 ΔE 0.087
Use #663B66 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.