#664091
Closest named color: Rebecca Purple (#663399). oklch(45.4% 0.131 303.2), rgb(102, 64, 145).
Aa
White text reads best on this color (7.75:1).
About this color
#664091 is a medium-dark, moderately saturated purple. In OKLCH its lightness is 45%, its chroma 0.131 and its hue 303°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.033 away. White text reads best on it, at 7.75:1.
| Hue family | Purples |
| Lightness | medium-dark (45%) |
| Chroma | moderately saturated (0.131) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 2.70:1 |
| White text | 7.75:1 |
Values
| HEX | #664091 |
| RGB | rgb(102, 64, 145) |
| HSL | hsl(268, 39%, 41%) |
| OKLCH | oklch(45.4% 0.131 303.2) |
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 #664091 | 7.75:1 | AAA | Lc -91.4 | Preferred for body text |
| Black text on #664091 | 2.70:1 | Fails | Lc 17.4 | Dividers and decoration only |
| #664091 text on white | 7.75:1 | AAA | Lc 86.6 | Fine for body text |
| #664091 text on black | 2.70:1 | Fails | Lc -15.4 | 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
#F7F4FB
oklch(97.1% 0.01 305.4)
-
Step 100
100
#EDE7F6
oklch(93.7% 0.021 304)
-
Step 200
200
#DFD3F1
oklch(88.6% 0.043 303.7)
-
Step 300
300
#CAB5EA
oklch(80.9% 0.077 302.8)
-
Step 400
400
#B08DDF
oklch(70.7% 0.122 303)
-
Step 500
500
#9D6ED6
oklch(63% 0.157 303.1)
-
Step 600
600
#8954C3
oklch(55.7% 0.169 303.4)
-
Step 700
700
#7443A8
oklch(49% 0.158 303.4)
-
Step 800
800 (this color)
#664091
oklch(45.4% 0.131 303.2)
-
Step 900
900
#4D316D
oklch(37.6% 0.102 303.4)
-
Step 950
950
#2D1D40
oklch(26.9% 0.065 303.4)
#664091 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) | #225294 | 0.099 |
| Deuteranopia (no green cones) | #2F528F | 0.090 |
| Tritanopia (no blue cones) | #5E4F62 | 0.097 |
| Achromatopsia (no color) | #525252 | 0.132 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664091
#664091
oklch(45.4% 0.131 303.2)
- #4B6000
#4B6000
oklch(45.5% 0.112 123.2)
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 #664091, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.033
- Dark Slate Blue #483D8B ΔE 0.056
- Blueberry #464196 ΔE 0.056
- Twilight #4E518B ΔE 0.059
- Dusk #4E5481 ΔE 0.072
- Light Eggplant #894585 ΔE 0.073
- Bluey Purple #6241C7 ΔE 0.087
- Dusty Grape #545775 ΔE 0.089
Use #664091 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.