#664A9D
Closest named color: Rebecca Purple (#663399). oklch(47.9% 0.13 296.8), rgb(102, 74, 157).
Aa
White text reads best on this color (6.92:1).
About this color
#664A9D is a medium-dark, moderately saturated purple. In OKLCH its lightness is 48%, its chroma 0.130 and its hue 297°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Rebecca Purple (#663399), ΔE 0.052 away. White text reads best on it, at 6.92:1.
| Hue family | Purples |
| Lightness | medium-dark (48%) |
| Chroma | moderately saturated (0.130) |
| Temperature | in between |
| Nearest name | Rebecca Purple (#663399) |
| Black text | 3.03:1 |
| White text | 6.92:1 |
Values
| HEX | #664A9D |
| RGB | rgb(102, 74, 157) |
| HSL | hsl(260, 36%, 45%) |
| OKLCH | oklch(47.9% 0.13 296.8) |
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 #664A9D | 6.92:1 | AA | Lc -88.7 | Fine for body text |
| Black text on #664A9D | 3.03:1 | AA large text | Lc 20.3 | Dividers and decoration only |
| #664A9D text on white | 6.92:1 | AA | Lc 83.7 | Fine for body text |
| #664A9D text on black | 3.03:1 | AA large text | Lc -18.2 | 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
#F6F4FB
oklch(97.1% 0.009 299.2)
-
Step 100
100
#EBE8F5
oklch(93.7% 0.018 296.6)
-
Step 200
200
#DBD5EE
oklch(88.5% 0.035 296.7)
-
Step 300
300
#C4B9E5
oklch(80.9% 0.062 296.4)
-
Step 400
400
#A793D8
oklch(70.7% 0.101 297.1)
-
Step 500
500
#9277CE
oklch(63.1% 0.13 296.8)
-
Step 600
600
#7D5EBA
oklch(55.5% 0.14 297.2)
-
Step 700
700 (this color)
#664A9D
oklch(47.9% 0.13 296.8)
-
Step 800
800
#564082
oklch(42.7% 0.107 297)
-
Step 900
900
#463768
oklch(37.7% 0.083 296.3)
-
Step 950
950
#29203D
oklch(26.9% 0.054 296.9)
#664A9D 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) | #2A5AA0 | 0.085 |
| Deuteranopia (no green cones) | #31599B | 0.080 |
| Tritanopia (no blue cones) | #5A5A6C | 0.102 |
| Achromatopsia (no color) | #5A5A5A | 0.131 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664A9D
#664A9D
oklch(47.9% 0.13 296.8)
- #5A6500
#5A6500
oklch(48.1% 0.111 116.9)
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 #664A9D, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Rebecca Purple #663399 ΔE 0.052
- Twilight #4E518B ΔE 0.053
- Blueberry #464196 ΔE 0.062
- Iris #6258C4 ΔE 0.067
- Dusk #4E5481 ΔE 0.068
- Dark Slate Blue #483D8B ΔE 0.069
- Bluey Purple #6241C7 ΔE 0.072
- Dusky Blue #475F94 ΔE 0.073
Use #664A9D 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.