#665BDF
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.194 281.8), rgb(102, 91, 223).
Aa
White text reads best on this color (5.08:1).
About this color
#665BDF is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.194 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.024 away. White text reads best on it, at 5.08:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.194) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #665BDF |
| RGB | rgb(102, 91, 223) |
| HSL | hsl(245, 67%, 62%) |
| OKLCH | oklch(55.5% 0.194 281.8) |
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 #665BDF | 5.08:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #665BDF | 4.12:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #665BDF text on white | 5.08:1 | AA | Lc 74.7 | Content text, not long reading |
| #665BDF text on black | 4.12:1 | AA large text | Lc -27.0 | 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
#E7E8FB
oklch(93.6% 0.026 283.5)
-
Step 200
200
#D3D6F9
oklch(88.5% 0.048 281.5)
-
Step 300
300
#B7BAF8
oklch(80.8% 0.087 282.1)
-
Step 400
400
#9394F5
oklch(70.7% 0.14 281.7)
-
Step 500
500
#7B76F1
oklch(63.1% 0.179 281.8)
-
Step 600
600 (this color)
#665BDF
oklch(55.5% 0.194 281.8)
-
Step 700
700
#554AC2
oklch(49.1% 0.181 281.6)
-
Step 800
800
#463E9D
oklch(42.8% 0.149 281.9)
-
Step 900
900
#3A367D
oklch(37.8% 0.117 281.8)
-
Step 950
950
#222049
oklch(27% 0.074 282.5)
#665BDF 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) | #0073E3 | 0.088 |
| Deuteranopia (no green cones) | #0069DC | 0.084 |
| Tritanopia (no blue cones) | #2E7A94 | 0.165 |
| Achromatopsia (no color) | #6E6E6E | 0.195 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665BDF
#665BDF
oklch(55.5% 0.194 281.8)
- #817500
#817500
oklch(55.6% 0.117 102.3)
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 #665BDF, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.024
- Light Indigo #6D5ACF ΔE 0.027
- Slate Blue #6A5ACD ΔE 0.028
- Warm Blue #4B57DB ΔE 0.041
- Iris #6258C4 ΔE 0.042
- Neon Blue #4361EE ΔE 0.050
- Medium Slate Blue #7B68EE ΔE 0.051
- Royal Blue #4169E1 ΔE 0.052
Use #665BDF 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.