#663899
Closest named color: Rebecca Purple (#663399). oklch(44.7% 0.153 302.4), rgb(102, 56, 153).
Aa
White text reads best on this color (8.10:1).
About this color
#663899 is a dark, vivid purple. In OKLCH its lightness is 45%, its chroma 0.153 and its hue 302°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.010 away. White text reads best on it, at 8.10:1.
| Hue family | Purples |
| Lightness | dark (45%) |
| Chroma | vivid (0.153) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.59:1 |
| White text | 8.10:1 |
Values
| HEX | #663899 |
| RGB | rgb(102, 56, 153) |
| HSL | hsl(268, 46%, 41%) |
| OKLCH | oklch(44.7% 0.153 302.4) |
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 #663899 | 8.10:1 | AAA | Lc -92.3 | Preferred for body text |
| Black text on #663899 | 2.59:1 | Fails | Lc 16.4 | Dividers and decoration only |
| #663899 text on white | 8.10:1 | AAA | Lc 87.6 | Fine for body text |
| #663899 text on black | 2.59:1 | Fails | Lc -14.5 | 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
#F7F4FC
oklch(97.2% 0.011 303.1)
-
Step 100
100
#EDE6F9
oklch(93.6% 0.026 302.6)
-
Step 200
200
#DFD2F5
oklch(88.5% 0.049 302.3)
-
Step 300
300
#CBB3F1
oklch(80.8% 0.09 302.2)
-
Step 400
400
#B289EA
oklch(70.7% 0.143 302.4)
-
Step 500
500
#A068E3
oklch(63.2% 0.182 302.5)
-
Step 600
600
#8B4BD1
oklch(55.6% 0.199 302.3)
-
Step 700
700
#773BB5
oklch(49.2% 0.185 302.7)
-
Step 800
800 (this color)
#663899
oklch(44.7% 0.153 302.4)
-
Step 900
900
#4E2D75
oklch(37.6% 0.12 302.1)
-
Step 950
950
#2E1B44
oklch(26.9% 0.076 303.1)
#663899 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) | #004F9C | 0.120 |
| Deuteranopia (no green cones) | #1A4F97 | 0.111 |
| Tritanopia (no blue cones) | #5C4D63 | 0.114 |
| Achromatopsia (no color) | #505050 | 0.154 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663899
#663899
oklch(44.7% 0.153 302.4)
- #4A5D00
#4A5D00
oklch(44.6% 0.109 122.4)
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 #663899, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.010
- Blueberry #464196 ΔE 0.058
- Dark Slate Blue #483D8B ΔE 0.059
- Grape #7209B7 ΔE 0.075
- Bluey Purple #6241C7 ΔE 0.076
- Twilight #4E518B ΔE 0.077
- Chrysanthemum #560BAD ΔE 0.081
- Blue With A Hint Of Purple #533CC6 ΔE 0.081
Use #663899 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.