#664FF8
Closest named color: Neon Blue (#4361EE). oklch(55.7% 0.239 281.5), rgb(102, 79, 248).
Aa
White text reads best on this color (5.19:1).
About this color
#664FF8 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.239 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.055 away. White text reads best on it, at 5.19:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.239) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.03:1 |
| White text | 5.19:1 |
Values
| HEX | #664FF8 |
| RGB | rgb(102, 79, 248) |
| HSL | hsl(248, 92%, 64%) |
| OKLCH | oklch(55.7% 0.239 281.5) |
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 #664FF8 | 5.19:1 | AA | Lc -80.4 | Fine for body text |
| Black text on #664FF8 | 4.03:1 | AA large text | Lc 29.0 | Dividers and decoration only |
| #664FF8 text on white | 5.19:1 | AA | Lc 75.0 | Fine for body text |
| #664FF8 text on black | 4.03:1 | AA large text | Lc -26.7 | 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 600.
-
Step 50
50
#F3F5FF
oklch(97.2% 0.013 277.1)
-
Step 100
100
#E6E8FF
oklch(93.6% 0.031 281.8)
-
Step 200
200
#D2D5FF
oklch(88.4% 0.058 281.9)
-
Step 300
300
#B5B9FF
oklch(80.8% 0.099 281.4)
-
Step 400
400
#9292FF
oklch(70.8% 0.157 281.6)
-
Step 500
500
#7A71FF
oklch(63.1% 0.204 281.7)
-
Step 600
600 (this color)
#664FF8
oklch(55.7% 0.239 281.5)
-
Step 700
700
#553DD8
oklch(49% 0.223 281.4)
-
Step 800
800
#4534AE
oklch(42.6% 0.184 281.5)
-
Step 900
900
#39308A
oklch(37.7% 0.144 281.5)
-
Step 950
950
#211D51
oklch(27% 0.092 281.8)
#664FF8 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) | #0072FD | 0.097 |
| Deuteranopia (no green cones) | #0067F5 | 0.088 |
| Tritanopia (no blue cones) | #007C9E | 0.201 |
| Achromatopsia (no color) | #6D6D6D | 0.240 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #664FF8
#664FF8
oklch(55.7% 0.239 281.5)
- #827500
#827500
oklch(55.7% 0.116 101.7)
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 #664FF8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.055
- Purpley Blue #5F34E7 ΔE 0.057
- Warm Blue #4B57DB ΔE 0.059
- Burple #6832E3 ΔE 0.060
- Purpley #8756E4 ΔE 0.066
- Medium Slate Blue #7B68EE ΔE 0.067
- Light Indigo #6D5ACF ΔE 0.068
- Dark Periwinkle #665FD1 ΔE 0.069
Use #664FF8 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.