#665AE6
Closest named color: Dark Periwinkle (#665FD1). oklch(55.9% 0.204 281.4), rgb(102, 90, 230).
Aa
White text reads best on this color (5.03:1).
About this color
#665AE6 is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.204 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.035 away. White text reads best on it, at 5.03:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.204) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.17:1 |
| White text | 5.03:1 |
Values
| HEX | #665AE6 |
| RGB | rgb(102, 90, 230) |
| HSL | hsl(245, 74%, 63%) |
| OKLCH | oklch(55.9% 0.204 281.4) |
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 #665AE6 | 5.03:1 | AA | Lc -79.7 | Fine for body text |
| Black text on #665AE6 | 4.17:1 | AA large text | Lc 29.7 | Dividers and decoration only |
| #665AE6 text on white | 5.03:1 | AA | Lc 74.3 | Content text, not long reading |
| #665AE6 text on black | 4.17:1 | AA large text | Lc -27.4 | 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
#F4F5FE
oklch(97.2% 0.012 281.1)
-
Step 100
100
#E6E8FC
oklch(93.5% 0.027 281.3)
-
Step 200
200
#D3D6FB
oklch(88.6% 0.051 281.6)
-
Step 300
300
#B6BAFB
oklch(80.9% 0.092 281.4)
-
Step 400
400
#9293F9
oklch(70.6% 0.147 281.5)
-
Step 500
500
#7A75F6
oklch(63.1% 0.187 281.3)
-
Step 600
600 (this color)
#665AE6
oklch(55.9% 0.204 281.4)
-
Step 700
700
#5548C7
oklch(49.2% 0.189 281.5)
-
Step 800
800
#453CA1
oklch(42.7% 0.157 281.4)
-
Step 900
900
#393580
oklch(37.8% 0.123 281.2)
-
Step 950
950
#21204B
oklch(27.1% 0.077 280.9)
#665AE6 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) | #0074EB | 0.089 |
| Deuteranopia (no green cones) | #006AE3 | 0.083 |
| Tritanopia (no blue cones) | #247C98 | 0.174 |
| Achromatopsia (no color) | #6F6F6F | 0.205 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665AE6
#665AE6
oklch(55.9% 0.204 281.4)
- #837500
#837500
oklch(55.8% 0.116 101)
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 #665AE6, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.035
- Light Indigo #6D5ACF ΔE 0.037
- Slate Blue #6A5ACD ΔE 0.039
- Warm Blue #4B57DB ΔE 0.043
- Neon Blue #4361EE ΔE 0.046
- Medium Slate Blue #7B68EE ΔE 0.049
- Iris #6258C4 ΔE 0.053
- Purpley #8756E4 ΔE 0.053
Use #665AE6 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.