#665CDC
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.189 281.8), rgb(102, 92, 220).
Aa
White text reads best on this color (5.08:1).
About this color
#665CDC is a medium-dark, vivid purple. In OKLCH its lightness is 55%, its chroma 0.189 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.019 away. White text reads best on it, at 5.08:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.189) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.12:1 |
| White text | 5.08:1 |
Values
| HEX | #665CDC |
| RGB | rgb(102, 92, 220) |
| HSL | hsl(245, 65%, 61%) |
| OKLCH | oklch(55.5% 0.189 281.8) |
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 #665CDC | 5.08:1 | AA | Lc -80.1 | Fine for body text |
| Black text on #665CDC | 4.12:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #665CDC text on white | 5.08:1 | AA | Lc 74.7 | Content text, not long reading |
| #665CDC 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
#E7E8FA
oklch(93.6% 0.024 283.4)
-
Step 200
200
#D3D6F8
oklch(88.5% 0.047 281.4)
-
Step 300
300
#B7BAF7
oklch(80.8% 0.086 282.1)
-
Step 400
400
#9495F3
oklch(70.8% 0.136 281.9)
-
Step 500
500
#7B77EE
oklch(63.1% 0.174 281.7)
-
Step 600
600 (this color)
#665CDC
oklch(55.5% 0.189 281.8)
-
Step 700
700
#564BBF
oklch(49.1% 0.175 282.1)
-
Step 800
800
#463E9B
oklch(42.7% 0.146 282.1)
-
Step 900
900
#3A367B
oklch(37.7% 0.114 282.1)
-
Step 950
950
#222048
oklch(26.9% 0.072 282.7)
#665CDC 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) | #0073E0 | 0.087 |
| Deuteranopia (no green cones) | #006AD9 | 0.084 |
| Tritanopia (no blue cones) | #317A93 | 0.161 |
| Achromatopsia (no color) | #6E6E6E | 0.190 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665CDC
#665CDC
oklch(55.5% 0.189 281.8)
- #817400
#817400
oklch(55.4% 0.116 101.6)
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 #665CDC, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.019
- Light Indigo #6D5ACF ΔE 0.023
- Slate Blue #6A5ACD ΔE 0.024
- Iris #6258C4 ΔE 0.038
- Warm Blue #4B57DB ΔE 0.041
- Royal Blue #4169E1 ΔE 0.051
- Neon Blue #4361EE ΔE 0.052
- Medium Slate Blue #7B68EE ΔE 0.052
Use #665CDC 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.