#663D8A
Closest named color: Rebecca Purple (#663399). oklch(44.5% 0.127 306.5), rgb(102, 61, 138).
Aa
White text reads best on this color (8.07:1).
About this color
#663D8A is a dark, moderately saturated purple. In OKLCH its lightness is 44%, its chroma 0.127 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 0.035 away. White text reads best on it, at 8.07:1.
| Hue family | Purples |
| Lightness | dark (44%) |
| Chroma | moderately saturated (0.127) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.59:1 |
| White text | 8.07:1 |
Values
| HEX | #663D8A |
| RGB | rgb(102, 61, 138) |
| HSL | hsl(272, 39%, 39%) |
| OKLCH | oklch(44.5% 0.127 306.5) |
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 #663D8A | 8.07:1 | AAA | Lc -92.4 | Preferred for body text |
| Black text on #663D8A | 2.59:1 | Fails | Lc 16.3 | Dividers and decoration only |
| #663D8A text on white | 8.07:1 | AAA | Lc 87.7 | Fine for body text |
| #663D8A 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE6F5
oklch(93.5% 0.021 306.8)
-
Step 200
200
#E0D3EF
oklch(88.6% 0.04 306.5)
-
Step 300
300
#CDB5E7
oklch(81% 0.074 306.6)
-
Step 400
400
#B38CDB
oklch(70.6% 0.119 306.2)
-
Step 500
500
#A16ED1
oklch(63.2% 0.152 306.3)
-
Step 600
600
#8C53BE
oklch(55.6% 0.166 306.3)
-
Step 700
700
#7743A3
oklch(49% 0.153 306.6)
-
Step 800
800 (this color)
#663D8A
oklch(44.5% 0.127 306.5)
-
Step 900
900
#4F316A
oklch(37.7% 0.099 306.6)
-
Step 950
950
#2E1D3E
oklch(26.9% 0.063 306.4)
#663D8A 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) | #244E8D | 0.100 |
| Deuteranopia (no green cones) | #315088 | 0.091 |
| Tritanopia (no blue cones) | #604B5D | 0.092 |
| Achromatopsia (no color) | #505050 | 0.128 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663D8A
#663D8A
oklch(44.5% 0.127 306.5)
- #435E00
#435E00
oklch(44.4% 0.114 126.5)
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 #663D8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.035
- Dark Slate Blue #483D8B ΔE 0.054
- Blueberry #464196 ΔE 0.059
- Twilight #4E518B ΔE 0.062
- Light Eggplant #894585 ΔE 0.074
- Dusk #4E5481 ΔE 0.074
- Dusty Grape #545775 ΔE 0.089
- Purple #800080 ΔE 0.092
Use #663D8A 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.