#664C8F
Closest named color: Twilight (#4E518B). oklch(47.4% 0.108 300.2), rgb(102, 76, 143).
Aa
White text reads best on this color (7.01:1).
About this color
#664C8F is a medium-dark, moderately saturated purple. In OKLCH its lightness is 47%, its chroma 0.108 and its hue 300°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.041 away. White text reads best on it, at 7.01:1.
| Hue family | Purples |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.108) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.99:1 |
| White text | 7.01:1 |
Values
| HEX | #664C8F |
| RGB | rgb(102, 76, 143) |
| HSL | hsl(263, 31%, 43%) |
| OKLCH | oklch(47.4% 0.108 300.2) |
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 #664C8F | 7.01:1 | AAA | Lc -89.1 | Fine for body text |
| Black text on #664C8F | 2.99:1 | Fails | Lc 19.9 | Dividers and decoration only |
| #664C8F text on white | 7.01:1 | AAA | Lc 84.1 | Fine for body text |
| #664C8F text on black | 2.99:1 | Fails | Lc -17.8 | 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
#F6F4FA
oklch(97% 0.008 301.4)
-
Step 100
100
#EBE8F3
oklch(93.7% 0.015 298.6)
-
Step 200
200
#DCD5EA
oklch(88.5% 0.029 301)
-
Step 300
300
#C5BADE
oklch(81% 0.051 299.2)
-
Step 400
400
#A995CD
oklch(70.7% 0.083 300.7)
-
Step 500
500
#947AC0
oklch(63.1% 0.106 300.5)
-
Step 600
600
#7E62AD
oklch(55.6% 0.116 299.8)
-
Step 700
700 (this color)
#664C8F
oklch(47.4% 0.108 300.2)
-
Step 800
800
#574278
oklch(42.6% 0.09 300.6)
-
Step 900
900
#473861
oklch(37.6% 0.07 299.9)
-
Step 950
950
#2A2139
oklch(27% 0.045 300.7)
#664C8F 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) | #385991 | 0.071 |
| Deuteranopia (no green cones) | #3E598D | 0.066 |
| Tritanopia (no blue cones) | #5E5866 | 0.085 |
| Achromatopsia (no color) | #595959 | 0.108 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664C8F
#664C8F
oklch(47.4% 0.108 300.2)
- #54640C
#54640C
oklch(47.3% 0.107 120.3)
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 #664C8F, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.041
- Dusk #4E5481 ΔE 0.051
- Rebecca Purple #663399 ΔE 0.063
- Dusky Blue #475F94 ΔE 0.065
- Dusty Grape #545775 ΔE 0.065
- Blueberry #464196 ΔE 0.066
- Light Eggplant #894585 ΔE 0.066
- Muted Purple #805B87 ΔE 0.068
Use #664C8F 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.