#664AAC
Closest named color: Iris (#6258C4). oklch(48.9% 0.15 293.2), rgb(102, 74, 172).
Aa
White text reads best on this color (6.68:1).
About this color
#664AAC is a medium-dark, vivid purple. In OKLCH its lightness is 49%, its chroma 0.150 and its hue 293°. Its hue sits between the warm and cool halves of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.048 away. White text reads best on it, at 6.68:1.
| Hue family | Purples |
| Lightness | medium-dark (49%) |
| Chroma | vivid (0.150) |
| Temperature | in between |
| Nearest name | Iris (#6258C4) |
| Black text | 3.14:1 |
| White text | 6.68:1 |
Values
| HEX | #664AAC |
| RGB | rgb(102, 74, 172) |
| HSL | hsl(257, 40%, 48%) |
| OKLCH | oklch(48.9% 0.15 293.2) |
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 #664AAC | 6.68:1 | AA | Lc -87.8 | Fine for body text |
| Black text on #664AAC | 3.14:1 | AA large text | Lc 21.3 | Dividers and decoration only |
| #664AAC text on white | 6.68:1 | AA | Lc 82.7 | Fine for body text |
| #664AAC text on black | 3.14:1 | AA large text | Lc -19.2 | 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
#F5F4FC
oklch(97% 0.011 292)
-
Step 100
100
#EAE8F7
oklch(93.7% 0.02 292.1)
-
Step 200
200
#DAD5F2
oklch(88.6% 0.04 293.5)
-
Step 300
300
#C2B8EC
oklch(80.8% 0.073 293.5)
-
Step 400
400
#A492E2
oklch(70.7% 0.116 293.5)
-
Step 500
500
#8E75DA
oklch(63% 0.149 293)
-
Step 600
600
#795BC8
oklch(55.5% 0.163 293)
-
Step 700
700 (this color)
#664AAC
oklch(48.9% 0.15 293.2)
-
Step 800
800
#533E8C
oklch(42.7% 0.124 292.8)
-
Step 900
900
#453570
oklch(37.7% 0.098 293.6)
-
Step 950
950
#282041
oklch(27% 0.06 293.1)
#664AAC 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) | #165DAF | 0.096 |
| Deuteranopia (no green cones) | #1F5AAA | 0.091 |
| Tritanopia (no blue cones) | #545F74 | 0.120 |
| Achromatopsia (no color) | #5C5C5C | 0.151 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664AAC
#664AAC
oklch(48.9% 0.15 293.2)
- #616600
#616600
oklch(48.9% 0.109 113.1)
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 #664AAC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.048
- Bluey Purple #6241C7 ΔE 0.049
- Rebecca Purple #663399 ΔE 0.057
- Slate Blue #6A5ACD ΔE 0.062
- Blue With A Hint Of Purple #533CC6 ΔE 0.064
- Light Indigo #6D5ACF ΔE 0.065
- Blueberry #464196 ΔE 0.069
- Twilight #4E518B ΔE 0.070
Use #664AAC 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.