#663570
Closest named color: Rebecca Purple (#663399). oklch(41.6% 0.11 320.6), rgb(102, 53, 112).
Aa
White text reads best on this color (9.09:1).
About this color
#663570 is a dark, moderately saturated purple. In OKLCH its lightness is 42%, its chroma 0.110 and its hue 321°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.069 away. White text reads best on it, at 9.09:1.
| Hue family | Purples |
| Lightness | dark (42%) |
| Chroma | moderately saturated (0.110) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.30:1 |
| White text | 9.09:1 |
Values
| HEX | #663570 |
| RGB | rgb(102, 53, 112) |
| HSL | hsl(290, 36%, 32%) |
| OKLCH | oklch(41.6% 0.11 320.6) |
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 #663570 | 9.09:1 | AAA | Lc -95.0 | Preferred for body text |
| Black text on #663570 | 2.30:1 | Fails | Lc 13.4 | Not readable |
| #663570 text on white | 9.09:1 | AAA | Lc 90.6 | Preferred for body text |
| #663570 text on black | 2.30:1 | Fails | Lc -11.7 | 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
#F8F4F9
oklch(97.2% 0.008 319.4)
-
Step 100
100
#F0E6F2
oklch(93.6% 0.019 320.6)
-
Step 200
200
#E4D2E8
oklch(88.5% 0.035 320.1)
-
Step 300
300
#D4B4DA
oklch(81% 0.063 321)
-
Step 400
400
#BE8BC8
oklch(70.7% 0.103 320.8)
-
Step 500
500
#AD6DBA
oklch(63.1% 0.132 320.7)
-
Step 600
600
#9853A6
oklch(55.6% 0.144 320.7)
-
Step 700
700
#81438E
oklch(49% 0.133 320.5)
-
Step 800
800 (this color)
#663570
oklch(41.6% 0.11 320.6)
-
Step 900
900
#56315D
oklch(37.8% 0.085 321.1)
-
Step 950
950
#321D37
oklch(27% 0.055 319.7)
#663570 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) | #2B4572 | 0.102 |
| Deuteranopia (no green cones) | #3A4A6E | 0.090 |
| Tritanopia (no blue cones) | #673D4D | 0.069 |
| Achromatopsia (no color) | #484848 | 0.111 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #663570
#663570
oklch(41.6% 0.11 320.6)
- #255A1B
#255A1B
oklch(41.7% 0.11 140.7)
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 #663570, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.069
- Dark Slate Blue #483D8B ΔE 0.071
- Velvet #750851 ΔE 0.083
- Grape Purple #5D1451 ΔE 0.083
- Rich Purple #720058 ΔE 0.083
- Brownish Purple #76424E ΔE 0.083
- Twilight #4E518B ΔE 0.085
- Blueberry #464196 ΔE 0.086
Use #663570 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.