#663A79
Closest named color: Rebecca Purple (#663399). oklch(43% 0.111 314.8), rgb(102, 58, 121).
Aa
White text reads best on this color (8.58:1).
About this color
#663A79 is a dark, moderately saturated purple. In OKLCH its lightness is 43%, its chroma 0.111 and its hue 315°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.057 away. White text reads best on it, at 8.58:1.
| Hue family | Purples |
| Lightness | dark (43%) |
| Chroma | moderately saturated (0.111) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.44:1 |
| White text | 8.58:1 |
Values
| HEX | #663A79 |
| RGB | rgb(102, 58, 121) |
| HSL | hsl(282, 35%, 35%) |
| OKLCH | oklch(43% 0.111 314.8) |
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 #663A79 | 8.58:1 | AAA | Lc -93.8 | Preferred for body text |
| Black text on #663A79 | 2.44:1 | Fails | Lc 14.8 | Not readable |
| #663A79 text on white | 8.58:1 | AAA | Lc 89.2 | Fine for body text |
| #663A79 text on black | 2.44:1 | Fails | Lc -13.0 | 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
#F8F4FA
oklch(97.2% 0.009 314.8)
-
Step 100
100
#EFE6F3
oklch(93.6% 0.02 315.7)
-
Step 200
200
#E2D2EA
oklch(88.4% 0.037 314.6)
-
Step 300
300
#D1B5DE
oklch(81% 0.064 315.1)
-
Step 400
400
#B98DCD
oklch(70.8% 0.103 315)
-
Step 500
500
#A76FC0
oklch(63.1% 0.132 314.8)
-
Step 600
600
#9255AD
oklch(55.6% 0.145 314.6)
-
Step 700
700
#7C4594
oklch(49% 0.134 314.6)
-
Step 800
800 (this color)
#663A79
oklch(43% 0.111 314.8)
-
Step 900
900
#533261
oklch(37.8% 0.087 315.2)
-
Step 950
950
#301E39
oklch(27.1% 0.054 313.8)
#663A79 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) | #2C497B | 0.096 |
| Deuteranopia (no green cones) | #3A4D77 | 0.085 |
| Tritanopia (no blue cones) | #654454 | 0.074 |
| Achromatopsia (no color) | #4C4C4C | 0.112 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663A79
#663A79
oklch(43% 0.111 314.8)
- #335C14
#335C14
oklch(42.9% 0.11 134.8)
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 #663A79, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.057
- Dark Slate Blue #483D8B ΔE 0.062
- Twilight #4E518B ΔE 0.071
- Blueberry #464196 ΔE 0.074
- Dusk #4E5481 ΔE 0.076
- Light Eggplant #894585 ΔE 0.077
- Dusty Grape #545775 ΔE 0.085
- Brownish Purple #76424E ΔE 0.088
Use #663A79 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.