#6668BB
Closest named color: Dark Periwinkle (#665FD1). oklch(55.5% 0.127 280.4), rgb(102, 104, 187).
Aa
White text reads best on this color (4.92:1).
About this color
#6668BB is a medium-dark, moderately saturated purple. In OKLCH its lightness is 55%, its chroma 0.127 and its hue 280°. Its hue sits on the cool side of the wheel. The nearest named color is Dark Periwinkle (#665FD1), ΔE 0.044 away. White text reads best on it, at 4.92:1.
| Hue family | Purples |
| Lightness | medium-dark (55%) |
| Chroma | moderately saturated (0.127) |
| Temperature | cool |
| Nearest name | Dark Periwinkle (#665FD1) |
| Black text | 4.26:1 |
| White text | 4.92:1 |
Values
| HEX | #6668BB |
| RGB | rgb(102, 104, 187) |
| HSL | hsl(239, 38%, 57%) |
| OKLCH | oklch(55.5% 0.127 280.4) |
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 #6668BB | 4.92:1 | AA | Lc -79.4 | Fine for body text |
| Black text on #6668BB | 4.26:1 | AA large text | Lc 30.1 | Non-text elements, placeholder text |
| #6668BB text on white | 4.92:1 | AA | Lc 74.0 | Content text, not long reading |
| #6668BB text on black | 4.26:1 | AA large text | Lc -27.7 | 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
#F4F5FB
oklch(97.1% 0.008 278.6)
-
Step 100
100
#E7E9F5
oklch(93.6% 0.016 278.5)
-
Step 200
200
#D5D7EE
oklch(88.5% 0.032 281.8)
-
Step 300
300
#B9BDE6
oklch(80.9% 0.058 280.6)
-
Step 400
400
#959AD9
oklch(70.6% 0.092 280.3)
-
Step 500
500
#7C80CF
oklch(63% 0.118 280.2)
-
Step 600
600 (this color)
#6668BB
oklch(55.5% 0.127 280.4)
-
Step 700
700
#5557A2
oklch(49.2% 0.118 280)
-
Step 800
800
#464783
oklch(42.7% 0.098 280.7)
-
Step 900
900
#3A3C69
oklch(37.7% 0.076 280.1)
-
Step 950
950
#22233D
oklch(26.9% 0.048 281)
#6668BB 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) | #4874BE | 0.045 |
| Deuteranopia (no green cones) | #426DB9 | 0.045 |
| Tritanopia (no blue cones) | #497988 | 0.111 |
| Achromatopsia (no color) | #707070 | 0.127 |
Harmonies
Hue rotations in OKLCH that keep this color's lightness and chroma.
Complementary
The opposite hue (180°).
- #6668BB
#6668BB
oklch(55.5% 0.127 280.4)
- #837400
#837400
oklch(55.6% 0.116 100.3)
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 #6668BB, closest first.
No curated palette has a color within ΔE 0.04 of #6668BB.
Similar named colors
The eight closest entries in our named color list, with their ΔE distance.
- Dark Periwinkle #665FD1 ΔE 0.044
- Iris #6258C4 ΔE 0.046
- Slate Blue #6A5ACD ΔE 0.047
- Light Indigo #6D5ACF ΔE 0.050
- French Blue #436BAD ΔE 0.051
- Windows Blue #3778BF ΔE 0.062
- Deep Lavender #8D5EB7 ΔE 0.064
- Flat Blue #3C73A8 ΔE 0.067
Use #6668BB 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.