#663596
Closest named color: Rebecca Purple (#663399). oklch(44.1% 0.154 304), rgb(102, 53, 150).
Aa
White text reads best on this color (8.35:1).
About this color
#663596 is a dark, vivid purple. In OKLCH its lightness is 44%, its chroma 0.154 and its hue 304°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.007 away. White text reads best on it, at 8.35:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | vivid (0.154) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.51:1 |
| White text | 8.35:1 |
Values
| HEX | #663596 |
| RGB | rgb(102, 53, 150) |
| HSL | hsl(270, 48%, 40%) |
| OKLCH | oklch(44.1% 0.154 304) |
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 #663596 | 8.35:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #663596 | 2.51:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #663596 text on white | 8.35:1 | AAA | Lc 88.3 | Fine for body text |
| #663596 text on black | 2.51:1 | Fails | Lc -13.9 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F8
oklch(93.6% 0.025 303.5)
-
Step 200
200
#E0D2F5
oklch(88.6% 0.05 303.5)
-
Step 300
300
#CDB3F0
oklch(81% 0.089 303.9)
-
Step 400
400
#B488E9
oklch(70.7% 0.144 303.9)
-
Step 500
500
#A266E2
oklch(63% 0.185 303.9)
-
Step 600
600
#8E4AD0
oklch(55.7% 0.2 303.9)
-
Step 700
700
#7939B4
oklch(49.1% 0.187 304.1)
-
Step 800
800 (this color)
#663596
oklch(44.1% 0.154 304)
-
Step 900
900
#502D74
oklch(37.8% 0.119 304)
-
Step 950
950
#2F1B44
oklch(27.1% 0.076 304.3)
#663596 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) | #004D99 | 0.123 |
| Deuteranopia (no green cones) | #194E94 | 0.115 |
| Tritanopia (no blue cones) | #5D4A60 | 0.114 |
| Achromatopsia (no color) | #4E4E4E | 0.155 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663596
#663596
oklch(44.1% 0.154 304)
- #465C00
#465C00
oklch(44% 0.11 124.2)
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 #663596, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.007
- Dark Slate Blue #483D8B ΔE 0.058
- Blueberry #464196 ΔE 0.060
- Grape #7209B7 ΔE 0.074
- Chrysanthemum #560BAD ΔE 0.079
- Twilight #4E518B ΔE 0.081
- Bluey Purple #6241C7 ΔE 0.082
- Purple #800080 ΔE 0.085
Use #663596 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.