#664779
Closest named color: Dusk (#4E5481). oklch(45.3% 0.087 311.8), rgb(102, 71, 121).
Aa
White text reads best on this color (7.65:1).
About this color
#664779 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 45%, its chroma 0.087 and its hue 312°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Dusk (#4E5481), ΔE 0.050 away. White text reads best on it, at 7.65:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.087) |
| Temperature | in between |
| Nearest name | Dusk (#4E5481) |
| Black text | 2.74:1 |
| White text | 7.65:1 |
Values
| HEX | #664779 |
| RGB | rgb(102, 71, 121) |
| HSL | hsl(277, 26%, 38%) |
| OKLCH | oklch(45.3% 0.087 311.8) |
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 #664779 | 7.65:1 | AAA | Lc -91.3 | Preferred for body text |
| Black text on #664779 | 2.74:1 | Fails | Lc 17.5 | Dividers and decoration only |
| #664779 text on white | 7.65:1 | AAA | Lc 86.5 | Fine for body text |
| #664779 text on black | 2.74:1 | Fails | Lc -15.6 | 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 800.
-
Step 50
50
#F7F4F9
oklch(97.1% 0.007 312.3)
-
Step 100
100
#EDE7F1
oklch(93.6% 0.015 312.2)
-
Step 200
200
#DFD4E7
oklch(88.4% 0.028 311.3)
-
Step 300
300
#CCB8D9
oklch(81% 0.051 312.1)
-
Step 400
400
#B292C6
oklch(70.7% 0.082 312.1)
-
Step 500
500
#9E77B7
oklch(63.1% 0.103 311.5)
-
Step 600
600
#895EA3
oklch(55.5% 0.114 311.8)
-
Step 700
700
#744E8C
oklch(49.1% 0.105 311.3)
-
Step 800
800 (this color)
#664779
oklch(45.3% 0.087 311.8)
-
Step 900
900
#4D375C
oklch(37.8% 0.067 310.7)
-
Step 950
950
#2D2036
oklch(26.9% 0.044 310.7)
#664779 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) | #3D527B | 0.068 |
| Deuteranopia (no green cones) | #455478 | 0.062 |
| Tritanopia (no blue cones) | #644E5A | 0.061 |
| Achromatopsia (no color) | #535353 | 0.088 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664779
#664779
oklch(45.3% 0.087 311.8)
- #44602A
#44602A
oklch(45.3% 0.087 131.7)
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 #664779, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dusk #4E5481 ΔE 0.050
- Twilight #4E518B ΔE 0.051
- Dusty Grape #545775 ΔE 0.054
- Light Eggplant #894585 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.071
- Brownish Purple #76424E ΔE 0.074
- Muted Purple #805B87 ΔE 0.075
- YInMn Blue #415A77 ΔE 0.076
Use #664779 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.