#664BA3
Closest named color: Rebecca Purple (#663399). oklch(48.5% 0.137 294.9), rgb(102, 75, 163).
Aa
White text reads best on this color (6.77:1).
About this color
#664BA3 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 49%, its chroma 0.137 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 0.055 away. White text reads best on it, at 6.77:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | moderately saturated (0.137) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 3.10:1 |
| White text | 6.77:1 |
Values
| HEX | #664BA3 |
| RGB | rgb(102, 75, 163) |
| HSL | hsl(258, 37%, 47%) |
| OKLCH | oklch(48.5% 0.137 294.9) |
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 #664BA3 | 6.77:1 | AA | Lc -88.1 | Fine for body text |
| Black text on #664BA3 | 3.10:1 | AA large text | Lc 20.9 | Dividers and decoration only |
| #664BA3 text on white | 6.77:1 | AA | Lc 83.1 | Fine for body text |
| #664BA3 text on black | 3.10:1 | 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
#DAD5F0
oklch(88.5% 0.037 294.1)
-
Step 300
300
#C3B9E8
oklch(81% 0.066 294.6)
-
Step 400
400
#A593DC
oklch(70.7% 0.106 294.9)
-
Step 500
500
#9077D2
oklch(63.1% 0.135 294.9)
-
Step 600
600
#7B5EBF
oklch(55.6% 0.147 295)
-
Step 700
700 (this color)
#664BA3
oklch(48.5% 0.137 294.9)
-
Step 800
800
#543F86
oklch(42.6% 0.114 294.7)
-
Step 900
900
#45366B
oklch(37.6% 0.089 294.8)
-
Step 950
950
#29203F
oklch(27% 0.057 295.7)
#664BA3 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) | #265CA6 | 0.087 |
| Deuteranopia (no green cones) | #2D5AA1 | 0.082 |
| Tritanopia (no blue cones) | #575D70 | 0.109 |
| Achromatopsia (no color) | #5B5B5B | 0.138 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664BA3
#664BA3
oklch(48.5% 0.137 294.9)
- #5E6600
#5E6600
oklch(48.7% 0.11 115)
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 #664BA3, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.055
- Iris #6258C4 ΔE 0.058
- Twilight #4E518B ΔE 0.058
- Bluey Purple #6241C7 ΔE 0.063
- Blueberry #464196 ΔE 0.065
- Slate Blue #6A5ACD ΔE 0.072
- Dusky Blue #475F94 ΔE 0.074
- Dark Slate Blue #483D8B ΔE 0.074
Use #664BA3 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.