#664AA6
Closest named color: Rebecca Purple (#663399). oklch(48.5% 0.142 294.5), rgb(102, 74, 166).
Aa
White text reads best on this color (6.78:1).
About this color
#664AA6 is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.142 and its hue 295°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.054 away. White text reads best on it, at 6.78:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.142) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 3.09:1 |
| White text | 6.78:1 |
Values
| HEX | #664AA6 |
| RGB | rgb(102, 74, 166) |
| HSL | hsl(258, 38%, 47%) |
| OKLCH | oklch(48.5% 0.142 294.5) |
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 #664AA6 | 6.78:1 | AA | Lc -88.2 | Fine for body text |
| Black text on #664AA6 | 3.09:1 | AA large text | Lc 20.9 | Dividers and decoration only |
| #664AA6 text on white | 6.78:1 | AA | Lc 83.1 | Fine for body text |
| #664AA6 text on black | 3.09:1 | AA large text | Lc -18.8 | Dividers and decoration only |
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 700.
-
Step 50
50
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EAE8F6
oklch(93.7% 0.019 292.6)
-
Step 200
200
#DAD5F1
oklch(88.6% 0.038 293.8)
-
Step 300
300
#C3B8E9
oklch(80.8% 0.069 295.1)
-
Step 400
400
#A593DE
oklch(70.8% 0.109 294.5)
-
Step 500
500
#9076D5
oklch(63.1% 0.141 294.6)
-
Step 600
600
#7B5DC2
oklch(55.7% 0.152 294.7)
-
Step 700
700 (this color)
#664AA6
oklch(48.5% 0.142 294.5)
-
Step 800
800
#543F88
oklch(42.7% 0.117 294.1)
-
Step 900
900
#45366D
oklch(37.7% 0.092 294.1)
-
Step 950
950
#282040
oklch(27% 0.059 293.6)
#664AA6 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) | #205CA9 | 0.092 |
| Deuteranopia (no green cones) | #285AA4 | 0.086 |
| Tritanopia (no blue cones) | #565D71 | 0.113 |
| Achromatopsia (no color) | #5B5B5B | 0.143 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664AA6
#664AA6
oklch(48.5% 0.142 294.5)
- #5E6500
#5E6500
oklch(48.4% 0.109 114.4)
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 #664AA6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.054
- Iris #6258C4 ΔE 0.055
- Bluey Purple #6241C7 ΔE 0.058
- Twilight #4E518B ΔE 0.063
- Blueberry #464196 ΔE 0.065
- Slate Blue #6A5ACD ΔE 0.069
- Blue With A Hint Of Purple #533CC6 ΔE 0.071
- Light Indigo #6D5ACF ΔE 0.073
Use #664AA6 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.