#665AF1
Closest named color: Neon Blue (#4361EE). oklch(56.8% 0.218 280.4), rgb(102, 90, 241).
Aa
White text reads best on this color (4.88:1).
About this color
#665AF1 is a medium-dark, vivid purple. In OKLCH its lightness is 57%, its chroma 0.218 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Neon Blue (#4361EE), ΔE 0.045 away. White text reads best on it, at 4.88:1.
| Hue family | Purples |
| Lightness | medium-dark (57%) |
| Chroma | vivid (0.218) |
| Temperature | cool |
| Nearest name | Neon Blue (#4361EE) |
| Black text | 4.29:1 |
| White text | 4.88:1 |
Values
| HEX | #665AF1 |
| RGB | rgb(102, 90, 241) |
| HSL | hsl(245, 84%, 65%) |
| OKLCH | oklch(56.8% 0.218 280.4) |
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 #665AF1 | 4.88:1 | AA | Lc -78.8 | Fine for body text |
| Black text on #665AF1 | 4.29:1 | AA large text | Lc 30.8 | Non-text elements, placeholder text |
| #665AF1 text on white | 4.88:1 | AA | Lc 73.3 | Content text, not long reading |
| #665AF1 text on black | 4.29:1 | AA large text | Lc -28.4 | 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 600.
-
Step 50
50
#F3F5FE
oklch(97.1% 0.012 276.1)
-
Step 100
100
#E6E8FD
oklch(93.6% 0.028 281.5)
-
Step 200
200
#D2D6FD
oklch(88.5% 0.054 280.6)
-
Step 300
300
#B4BAFF
oklch(80.9% 0.098 280.1)
-
Step 400
400
#9093FF
oklch(70.8% 0.156 280.4)
-
Step 500
500
#7773FE
oklch(63.1% 0.201 280.3)
-
Step 600
600 (this color)
#665AF1
oklch(56.8% 0.218 280.4)
-
Step 700
700
#5345CE
oklch(49.1% 0.202 280.5)
-
Step 800
800
#433AA7
oklch(42.7% 0.168 280.3)
-
Step 900
900
#383484
oklch(37.8% 0.13 280.4)
-
Step 950
950
#201F4D
oklch(26.9% 0.083 280.3)
#665AF1 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) | #0077F6 | 0.090 |
| Deuteranopia (no green cones) | #006BEE | 0.082 |
| Tritanopia (no blue cones) | #06809D | 0.188 |
| Achromatopsia (no color) | #717171 | 0.219 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665AF1
#665AF1
oklch(56.8% 0.218 280.4)
- #877800
#877800
oklch(56.9% 0.119 100.6)
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 #665AF1, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Neon Blue #4361EE ΔE 0.045
- Medium Slate Blue #7B68EE ΔE 0.048
- Dark Periwinkle #665FD1 ΔE 0.051
- Warm Blue #4B57DB ΔE 0.052
- Light Indigo #6D5ACF ΔE 0.053
- Slate Blue #6A5ACD ΔE 0.055
- Purpley #8756E4 ΔE 0.057
- Royal Blue #4169E1 ΔE 0.058
Use #665AF1 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.