#663973
Closest named color: Rebecca Purple (#663399). oklch(42.4% 0.106 318.3), rgb(102, 57, 115).
Aa
White text reads best on this color (8.75:1).
About this color
#663973 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.106 and its hue 318°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.066 away. White text reads best on it, at 8.75:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.106) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.39:1 |
| White text | 8.75:1 |
Values
| HEX | #663973 |
| RGB | rgb(102, 57, 115) |
| HSL | hsl(287, 34%, 34%) |
| OKLCH | oklch(42.4% 0.106 318.3) |
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 #663973 | 8.75:1 | AAA | Lc -94.2 | Preferred for body text |
| Black text on #663973 | 2.39:1 | Fails | Lc 14.2 | Not readable |
| #663973 text on white | 8.75:1 | AAA | Lc 89.7 | Fine for body text |
| #663973 text on black | 2.39:1 | Fails | Lc -12.5 | 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
#EFE6F2
oklch(93.5% 0.019 317.7)
-
Step 200
200
#E3D2E8
oklch(88.4% 0.035 318.5)
-
Step 300
300
#D2B5DB
oklch(81% 0.061 318.1)
-
Step 400
400
#BB8DC8
oklch(70.7% 0.098 318.7)
-
Step 500
500
#A96FBA
oklch(63% 0.126 318.3)
-
Step 600
600
#9456A6
oklch(55.6% 0.137 318.3)
-
Step 700
700
#7E468F
oklch(49.1% 0.127 317.9)
-
Step 800
800 (this color)
#663973
oklch(42.4% 0.106 318.3)
-
Step 900
900
#54325D
oklch(37.7% 0.082 319)
-
Step 950
950
#311E37
oklch(27.1% 0.052 317.8)
#663973 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) | #2F4875 | 0.094 |
| Deuteranopia (no green cones) | #3C4C71 | 0.084 |
| Tritanopia (no blue cones) | #664150 | 0.069 |
| Achromatopsia (no color) | #4B4B4B | 0.106 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663973
#663973
oklch(42.4% 0.106 318.3)
- #2E5B1D
#2E5B1D
oklch(42.4% 0.105 138.2)
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 #663973, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.066
- Dark Slate Blue #483D8B ΔE 0.067
- Twilight #4E518B ΔE 0.076
- Dusk #4E5481 ΔE 0.079
- Light Eggplant #894585 ΔE 0.080
- Brownish Purple #76424E ΔE 0.081
- Blueberry #464196 ΔE 0.081
- Dusty Grape #545775 ΔE 0.085
Use #663973 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.