#664EC4
Closest named color: Iris (#6258C4). oklch(51.3% 0.176 287.9), rgb(102, 78, 196).
Aa
White text reads best on this color (6.08:1).
About this color
#664EC4 is a medium-dark, vivid purple. In OKLCH its lightness is 51%, its chroma 0.176 and its hue 288°. Its hue sits on the cool side of the wheel. The nearest named color is Iris (#6258C4), ΔE 0.023 away. White text reads best on it, at 6.08:1.
| Hue family | Purples |
| Lightness | medium-dark (51%) |
| Chroma | vivid (0.176) |
| Temperature | cool |
| Nearest name | Iris (#6258C4) |
| Black text | 3.45:1 |
| White text | 6.08:1 |
Values
| HEX | #664EC4 |
| RGB | rgb(102, 78, 196) |
| HSL | hsl(252, 50%, 54%) |
| OKLCH | oklch(51.3% 0.176 287.9) |
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 #664EC4 | 6.08:1 | AA | Lc -85.2 | Fine for body text |
| Black text on #664EC4 | 3.45:1 | AA large text | Lc 24.1 | Dividers and decoration only |
| #664EC4 text on white | 6.08:1 | AA | Lc 80.0 | Fine for body text |
| #664EC4 text on black | 3.45:1 | AA large text | Lc -21.8 | 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
#F5F4FD
oklch(97% 0.012 291.3)
-
Step 100
100
#E8E8FA
oklch(93.6% 0.024 285.9)
-
Step 200
200
#D7D5F7
oklch(88.5% 0.047 288.1)
-
Step 300
300
#BDB8F5
oklch(80.8% 0.086 288.1)
-
Step 400
400
#9D91F0
oklch(70.6% 0.137 288.2)
-
Step 500
500
#8773EB
oklch(63.1% 0.174 288)
-
Step 600
600
#7258D9
oklch(55.6% 0.189 287.9)
-
Step 700
700 (this color)
#664EC4
oklch(51.3% 0.176 287.9)
-
Step 800
800
#4E3B98
oklch(42.6% 0.145 288)
-
Step 900
900
#403479
oklch(37.7% 0.113 287.7)
-
Step 950
950
#251F47
oklch(26.9% 0.072 287.4)
#664EC4 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) | #0065C8 | 0.098 |
| Deuteranopia (no green cones) | #005FC2 | 0.096 |
| Tritanopia (no blue cones) | #476981 | 0.145 |
| Achromatopsia (no color) | #626262 | 0.177 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664EC4
#664EC4
oklch(51.3% 0.176 287.9)
- #6E6B00
#6E6B00
oklch(51.4% 0.111 107.8)
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 #664EC4, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Iris #6258C4 ΔE 0.023
- Bluey Purple #6241C7 ΔE 0.030
- Slate Blue #6A5ACD ΔE 0.031
- Light Indigo #6D5ACF ΔE 0.034
- Dark Periwinkle #665FD1 ΔE 0.043
- Blue With A Hint Of Purple #533CC6 ΔE 0.053
- Warm Blue #4B57DB ΔE 0.054
- Blurple #5539CC ΔE 0.056
Use #664EC4 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.