#665FDF
Closest named color: Dark Periwinkle (#665FD1). oklch(56.2% 0.189 280.9), rgb(102, 95, 223).
Aa
White text reads best on this color (4.92:1).
About this color
#665FDF is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.189 and its hue 281°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.021 away. White text reads best on it, at 4.92:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.189) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #665FDF |
| RGB | rgb(102, 95, 223) |
| HSL | hsl(243, 67%, 62%) |
| OKLCH | oklch(56.2% 0.189 280.9) |
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 #665FDF | 4.92:1 | AA | Lc -79.1 | Fine for body text |
| Black text on #665FDF | 4.26:1 | AA large text | Lc 30.4 | Non-text elements, placeholder text |
| #665FDF text on white | 4.92:1 | AA | Lc 73.7 | Content text, not long reading |
| #665FDF text on black | 4.26:1 | AA large text | Lc -28.0 | 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
#F4F5FD
oklch(97.2% 0.011 280.5)
-
Step 100
100
#E6E8FB
oklch(93.5% 0.026 281.1)
-
Step 200
200
#D3D6F9
oklch(88.5% 0.048 281.5)
-
Step 300
300
#B6BBF7
oklch(80.9% 0.085 280.6)
-
Step 400
400
#9295F3
oklch(70.7% 0.136 280.9)
-
Step 500
500
#7978EE
oklch(63.1% 0.173 280.6)
-
Step 600
600 (this color)
#665FDF
oklch(56.2% 0.189 280.9)
-
Step 700
700
#544CC0
oklch(49.2% 0.175 280.9)
-
Step 800
800
#443F9B
oklch(42.7% 0.145 280.7)
-
Step 900
900
#39377B
oklch(37.8% 0.112 280.9)
-
Step 950
950
#212148
oklch(27.1% 0.071 280.6)
#665FDF 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) | #0075E3 | 0.085 |
| Deuteranopia (no green cones) | #006CDC | 0.081 |
| Tritanopia (no blue cones) | #2D7D96 | 0.162 |
| Achromatopsia (no color) | #707070 | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665FDF
#665FDF
oklch(56.2% 0.189 280.9)
- #847600
#847600
oklch(56.1% 0.117 101.1)
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 #665FDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.021
- Light Indigo #6D5ACF ΔE 0.028
- Slate Blue #6A5ACD ΔE 0.029
- Iris #6258C4 ΔE 0.044
- Warm Blue #4B57DB ΔE 0.045
- Medium Slate Blue #7B68EE ΔE 0.045
- Royal Blue #4169E1 ΔE 0.048
- Neon Blue #4361EE ΔE 0.049
Use #665FDF 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.