#663E73
Closest named color: Twilight (#4E518B). oklch(43.3% 0.096 317.5), rgb(102, 62, 115).
Aa
White text reads best on this color (8.39:1).
About this color
#663E73 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.096 and its hue 317°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.067 away. White text reads best on it, at 8.39:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.096) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.50:1 |
| White text | 8.39:1 |
Values
| HEX | #663E73 |
| RGB | rgb(102, 62, 115) |
| HSL | hsl(285, 30%, 35%) |
| OKLCH | oklch(43.3% 0.096 317.5) |
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 #663E73 | 8.39:1 | AAA | Lc -93.3 | Preferred for body text |
| Black text on #663E73 | 2.50:1 | Fails | Lc 15.2 | Dividers and decoration only |
| #663E73 text on white | 8.39:1 | AAA | Lc 88.7 | Fine for body text |
| #663E73 text on black | 2.50:1 | Fails | Lc -13.5 | 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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#EEE7F1
oklch(93.6% 0.015 316)
-
Step 200
200
#E2D3E7
oklch(88.5% 0.031 317.7)
-
Step 300
300
#D0B6D9
oklch(80.9% 0.056 317.4)
-
Step 400
400
#B88FC6
oklch(70.7% 0.09 317.4)
-
Step 500
500
#A672B7
oklch(63.1% 0.116 317.6)
-
Step 600
600
#9159A3
oklch(55.5% 0.126 317.6)
-
Step 700
700
#7B498B
oklch(49% 0.116 317.6)
-
Step 800
800 (this color)
#663E73
oklch(43.3% 0.096 317.5)
-
Step 900
900
#52345C
oklch(37.8% 0.076 317.4)
-
Step 950
950
#301F36
oklch(27.1% 0.047 317)
#663E73 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) | #354B75 | 0.084 |
| Deuteranopia (no green cones) | #404F71 | 0.076 |
| Tritanopia (no blue cones) | #664553 | 0.062 |
| Achromatopsia (no color) | #4D4D4D | 0.097 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663E73
#663E73
oklch(43.3% 0.096 317.5)
- #355D24
#355D24
oklch(43.5% 0.097 137.4)
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 #663E73, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.067
- Dusk #4E5481 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.069
- Rebecca Purple #663399 ΔE 0.071
- Dusty Grape #545775 ΔE 0.073
- Brownish Purple #76424E ΔE 0.073
- Light Eggplant #894585 ΔE 0.075
- Blueberry #464196 ΔE 0.080
Use #663E73 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.