#665CDD
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.19 281.7), rgb(102, 92, 221).
Aa
White text reads best on this color (5.07:1).
About this color
#665CDD is a medium-dark, vivid purple. In OKLCH its lightness is 56%, its chroma 0.190 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.020 away. White text reads best on it, at 5.07:1.
| Hue family | Purples |
| Lightness | medium-dark (56%) |
| Chroma | vivid (0.190) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.13:1 |
| White text | 5.07:1 |
Values
| HEX | #665CDD |
| RGB | rgb(102, 92, 221) |
| HSL | hsl(245, 65%, 61%) |
| OKLCH | oklch(55.5% 0.19 281.7) |
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 #665CDD | 5.07:1 | AA | Lc -80.0 | Fine for body text |
| Black text on #665CDD | 4.13:1 | AA large text | Lc 29.4 | Dividers and decoration only |
| #665CDD text on white | 5.07:1 | AA | Lc 74.6 | Content text, not long reading |
| #665CDD text on black | 4.13:1 | AA large text | Lc -27.1 | 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
#B7BAF7
oklch(80.8% 0.086 282.1)
-
Step 400
400
#9395F3
oklch(70.7% 0.136 281.4)
-
Step 500
500
#7B77EF
oklch(63.1% 0.175 281.6)
-
Step 600
600 (this color)
#665CDD
oklch(55.5% 0.19 281.7)
-
Step 700
700
#554BC0
oklch(49.1% 0.177 281.6)
-
Step 800
800
#453E9B
oklch(42.6% 0.146 281.6)
-
Step 900
900
#3A367B
oklch(37.7% 0.114 282.1)
-
Step 950
950
#222048
oklch(26.9% 0.072 282.7)
#665CDD 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) | #0073E1 | 0.087 |
| Deuteranopia (no green cones) | #006ADA | 0.084 |
| Tritanopia (no blue cones) | #307A94 | 0.161 |
| Achromatopsia (no color) | #6E6E6E | 0.191 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #665CDD
#665CDD
oklch(55.5% 0.19 281.7)
- #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 #665CDD, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.020
- Light Indigo #6D5ACF ΔE 0.024
- Slate Blue #6A5ACD ΔE 0.025
- Iris #6258C4 ΔE 0.040
- Warm Blue #4B57DB ΔE 0.041
- Royal Blue #4169E1 ΔE 0.051
- Neon Blue #4361EE ΔE 0.051
- Medium Slate Blue #7B68EE ΔE 0.051
Use #665CDD 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.