#6663C8
Closest named color: Dark Periwinkle (#665FD1). oklch(55.3% 0.152 281.5), rgb(102, 99, 200).
Aa
White text reads best on this color (5.01:1).
About this color
#6663C8 is a medium-dark, vivid purple. In OKLCH its lightness is 55%, its chroma 0.152 and its hue 282°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.018 away. White text reads best on it, at 5.01:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | vivid (0.152) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.18:1 |
| White text | 5.01:1 |
Values
| HEX | #6663C8 |
| RGB | rgb(102, 99, 200) |
| HSL | hsl(242, 48%, 59%) |
| OKLCH | oklch(55.3% 0.152 281.5) |
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 #6663C8 | 5.01:1 | AA | Lc -79.9 | Fine for body text |
| Black text on #6663C8 | 4.18:1 | AA large text | Lc 29.6 | Dividers and decoration only |
| #6663C8 text on white | 5.01:1 | AA | Lc 74.5 | Content text, not long reading |
| #6663C8 text on black | 4.18:1 | AA large text | Lc -27.2 | 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
#F4F5FC
oklch(97.1% 0.009 279.7)
-
Step 100
100
#E7E9F7
oklch(93.7% 0.019 279.5)
-
Step 200
200
#D4D7F2
oklch(88.5% 0.037 280.6)
-
Step 300
300
#B8BCED
oklch(80.9% 0.069 281.1)
-
Step 400
400
#9598E3
oklch(70.7% 0.109 281.5)
-
Step 500
500
#7C7DDB
oklch(63.1% 0.139 281.2)
-
Step 600
600 (this color)
#6663C8
oklch(55.3% 0.152 281.5)
-
Step 700
700
#5652AE
oklch(49.1% 0.142 281.7)
-
Step 800
800
#46448D
oklch(42.8% 0.118 281.4)
-
Step 900
900
#3A3A70
oklch(37.7% 0.091 281.1)
-
Step 950
950
#222242
oklch(27% 0.059 281.7)
#6663C8 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) | #3373CC | 0.064 |
| Deuteranopia (no green cones) | #2B6CC6 | 0.066 |
| Tritanopia (no blue cones) | #42798C | 0.131 |
| Achromatopsia (no color) | #6F6F6F | 0.153 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6663C8
#6663C8
oklch(55.3% 0.152 281.5)
- #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 #6663C8, closest first.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.018
- Slate Blue #6A5ACD ΔE 0.024
- Light Indigo #6D5ACF ΔE 0.026
- Iris #6258C4 ΔE 0.029
- Royal Blue #4169E1 ΔE 0.058
- Warm Blue #4B57DB ΔE 0.059
- French Blue #436BAD ΔE 0.067
- Medium Slate Blue #7B68EE ΔE 0.067
Use #6663C8 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.