#663B89
Closest named color: Rebecca Purple (#663399). oklch(44.1% 0.129 307.4), rgb(102, 59, 137).
Aa
White text reads best on this color (8.22:1).
About this color
#663B89 is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.129 and its hue 307°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.033 away. White text reads best on it, at 8.22:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.129) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.55:1 |
| White text | 8.22:1 |
Values
| HEX | #663B89 |
| RGB | rgb(102, 59, 137) |
| HSL | hsl(273, 40%, 38%) |
| OKLCH | oklch(44.1% 0.129 307.4) |
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 #663B89 | 8.22:1 | AAA | Lc -92.8 | Preferred for body text |
| Black text on #663B89 | 2.55:1 | Fails | Lc 15.9 | Dividers and decoration only |
| #663B89 text on white | 8.22:1 | AAA | Lc 88.1 | Fine for body text |
| #663B89 text on black | 2.55:1 | Fails | Lc -14.0 | 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
#E0D2EF
oklch(88.4% 0.042 307.2)
-
Step 300
300
#CEB4E7
oklch(80.9% 0.076 307.8)
-
Step 400
400
#B58CDB
oklch(70.8% 0.12 307.4)
-
Step 500
500
#A36DD1
oklch(63.2% 0.154 307.5)
-
Step 600
600
#8E52BE
oklch(55.6% 0.168 307.5)
-
Step 700
700
#7942A4
oklch(49.2% 0.156 307.5)
-
Step 800
800 (this color)
#663B89
oklch(44.1% 0.129 307.4)
-
Step 900
900
#50306A
oklch(37.6% 0.101 307.7)
-
Step 950
950
#2F1D3E
oklch(27% 0.063 307.9)
#663B89 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) | #214D8C | 0.104 |
| Deuteranopia (no green cones) | #304F87 | 0.094 |
| Tritanopia (no blue cones) | #61495C | 0.092 |
| Achromatopsia (no color) | #4F4F4F | 0.130 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663B89
#663B89
oklch(44.1% 0.129 307.4)
- #415E00
#415E00
oklch(44.2% 0.115 127.5)
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 #663B89, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.054
- Blueberry #464196 ΔE 0.060
- Twilight #4E518B ΔE 0.066
- Light Eggplant #894585 ΔE 0.076
- Dusk #4E5481 ΔE 0.077
- Purple #800080 ΔE 0.089
- Dusty Grape #545775 ΔE 0.092
Use #663B89 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.