#663A89
Closest named color: Rebecca Purple (#663399). oklch(43.9% 0.131 307.6), rgb(102, 58, 137).
Aa
White text reads best on this color (8.29:1).
About this color
#663A89 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.131 and its hue 308°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.032 away. White text reads best on it, at 8.29:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.53:1 |
| White text | 8.29:1 |
Values
| HEX | #663A89 |
| RGB | rgb(102, 58, 137) |
| HSL | hsl(273, 41%, 38%) |
| OKLCH | oklch(43.9% 0.131 307.6) |
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 #663A89 | 8.29:1 | AAA | Lc -92.9 | Preferred for body text |
| Black text on #663A89 | 2.53:1 | Fails | Lc 15.7 | Dividers and decoration only |
| #663A89 text on white | 8.29:1 | AAA | Lc 88.3 | Fine for body text |
| #663A89 text on black | 2.53:1 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EEE6F6
oklch(93.6% 0.023 308.2)
-
Step 200
200
#E1D2EF
oklch(88.5% 0.042 308.6)
-
Step 300
300
#CEB4E7
oklch(80.9% 0.076 307.8)
-
Step 400
400
#B58BDB
oklch(70.6% 0.122 307.6)
-
Step 500
500
#A36CD1
oklch(63.1% 0.155 307.7)
-
Step 600
600
#8E51BE
oklch(55.5% 0.169 307.6)
-
Step 700
700
#7941A4
oklch(49% 0.158 307.7)
-
Step 800
800 (this color)
#663A89
oklch(43.9% 0.131 307.6)
-
Step 900
900
#50306B
oklch(37.7% 0.102 307.2)
-
Step 950
950
#2F1D3E
oklch(27% 0.063 307.9)
#663A89 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) | #1F4D8C | 0.107 |
| Deuteranopia (no green cones) | #2F4F87 | 0.096 |
| Tritanopia (no blue cones) | #61495C | 0.093 |
| Achromatopsia (no color) | #4E4E4E | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A89
#663A89
oklch(43.9% 0.131 307.6)
- #405D00
#405D00
oklch(43.9% 0.114 127.7)
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 #663A89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.032
- Dark Slate Blue #483D8B ΔE 0.054
- Blueberry #464196 ΔE 0.061
- Twilight #4E518B ΔE 0.068
- Light Eggplant #894585 ΔE 0.077
- Dusk #4E5481 ΔE 0.080
- Purple #800080 ΔE 0.087
- Warm Purple #952E8F ΔE 0.093
Use #663A89 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.