#664E8A
Closest named color: Twilight (#4E518B). oklch(47.5% 0.097 301.2), rgb(102, 78, 138).
Aa
White text reads best on this color (6.94:1).
About this color
#664E8A is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.097 and its hue 301°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.039 away. White text reads best on it, at 6.94:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.097) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 3.02:1 |
| White text | 6.94:1 |
Values
| HEX | #664E8A |
| RGB | rgb(102, 78, 138) |
| HSL | hsl(264, 28%, 42%) |
| OKLCH | oklch(47.5% 0.097 301.2) |
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 #664E8A | 6.94:1 | AA | Lc -88.9 | Fine for body text |
| Black text on #664E8A | 3.02:1 | AA large text | Lc 20.1 | Dividers and decoration only |
| #664E8A text on white | 6.94:1 | AA | Lc 83.9 | Fine for body text |
| #664E8A text on black | 3.02:1 | AA large text | Lc -18.0 | 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
#F6F4F9
oklch(97% 0.007 304.2)
-
Step 100
100
#EBE8F2
oklch(93.6% 0.014 299.8)
-
Step 200
200
#DCD5E8
oklch(88.4% 0.027 302.5)
-
Step 300
300
#C5BADB
oklch(80.9% 0.047 300.5)
-
Step 400
400
#A896C9
oklch(70.7% 0.076 300.6)
-
Step 500
500
#947BBB
oklch(63.1% 0.098 301.6)
-
Step 600
600
#7E64A7
oklch(55.7% 0.105 300.9)
-
Step 700
700 (this color)
#664E8A
oklch(47.5% 0.097 301.2)
-
Step 800
800
#574474
oklch(42.8% 0.08 301.3)
-
Step 900
900
#47395E
oklch(37.6% 0.064 300.8)
-
Step 950
950
#2A2237
oklch(27.1% 0.04 301.3)
#664E8A 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) | #3E598C | 0.063 |
| Deuteranopia (no green cones) | #435988 | 0.059 |
| Tritanopia (no blue cones) | #5F5865 | 0.075 |
| Achromatopsia (no color) | #5A5A5A | 0.098 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664E8A
#664E8A
oklch(47.5% 0.097 301.2)
- #54641D
#54641D
oklch(47.5% 0.097 121.2)
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 #664E8A, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.039
- Dusk #4E5481 ΔE 0.045
- Dusty Grape #545775 ΔE 0.056
- Dusky Blue #475F94 ΔE 0.061
- Muted Purple #805B87 ΔE 0.062
- Light Eggplant #894585 ΔE 0.065
- Denim Blue #3B5B92 ΔE 0.068
- Dull Purple #84597E ΔE 0.069
Use #664E8A 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.