#664A91
Closest named color: Twilight (#4E518B). oklch(47.2% 0.114 300.3), rgb(102, 74, 145).
Aa
White text reads best on this color (7.11:1).
About this color
#664A91 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 47%, its chroma 0.114 and its hue 300°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Twilight (#4E518B), ΔE 0.044 away. White text reads best on it, at 7.11:1.
| Hue family | Purples |
| Lightness | medium-dark (47%) |
| Chroma | moderately saturated (0.114) |
| Temperature | in between |
| Nearest name | Twilight (#4E518B) |
| Black text | 2.95:1 |
| White text | 7.11:1 |
Values
| HEX | #664A91 |
| RGB | rgb(102, 74, 145) |
| HSL | hsl(264, 32%, 43%) |
| OKLCH | oklch(47.2% 0.114 300.3) |
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 #664A91 | 7.11:1 | AAA | Lc -89.4 | Fine for body text |
| Black text on #664A91 | 2.95:1 | Fails | Lc 19.5 | Dividers and decoration only |
| #664A91 text on white | 7.11:1 | AAA | Lc 84.5 | Fine for body text |
| #664A91 text on black | 2.95:1 | Fails | Lc -17.5 | 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
#DCD5EB
oklch(88.5% 0.031 300.3)
-
Step 300
300
#C6B9E0
oklch(80.9% 0.056 300.4)
-
Step 400
400
#A994D0
oklch(70.7% 0.089 300.2)
-
Step 500
500
#9479C3
oklch(63.1% 0.112 300)
-
Step 600
600
#7F61B0
oklch(55.7% 0.122 300)
-
Step 700
700 (this color)
#664A91
oklch(47.2% 0.114 300.3)
-
Step 800
800
#57417A
oklch(42.5% 0.094 300.2)
-
Step 900
900
#483863
oklch(37.8% 0.074 300)
-
Step 950
950
#2A213A
oklch(27% 0.047 299.9)
#664A91 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) | #345894 | 0.077 |
| Deuteranopia (no green cones) | #3B588F | 0.071 |
| Tritanopia (no blue cones) | #5E5766 | 0.089 |
| Achromatopsia (no color) | #585858 | 0.115 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664A91
#664A91
oklch(47.2% 0.114 300.3)
- #536400
#536400
oklch(47.2% 0.113 120.5)
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 #664A91, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Twilight #4E518B ΔE 0.044
- Dusk #4E5481 ΔE 0.056
- Rebecca Purple #663399 ΔE 0.056
- Blueberry #464196 ΔE 0.063
- Dark Slate Blue #483D8B ΔE 0.066
- Light Eggplant #894585 ΔE 0.067
- Dusky Blue #475F94 ΔE 0.069
- Dusty Grape #545775 ΔE 0.071
Use #664A91 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.