Cool palette generator
Nearest named colour: steelblue
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Generates palettes drawn from the cool arc: greens, blues and violets, roughly hue 160 through 280.
How to use the cool palette generator
Cool palettes dominate software interfaces, and the reason is mostly about what they leave room for. Blue is the least emotionally loaded hue in most cultures, which makes it a safe default, and a cool ground makes any warm accent stand out sharply. The practical caution is that blues are where display calibration varies most, so a blue that looks right on your monitor can look noticeably different on a phone: worth checking on a second screen before committing. Cool colours also recede, which is useful for backgrounds and unhelpful for anything meant to be noticed.
Questions
Roughly 160 through 280: greens, blues and violets.
It is the least emotionally loaded hue in most cultures and it recedes, leaving warm accents free to stand out.
More than any other hue. Check a blue on a second display before committing to it.
Not necessarily. A palette generator arranges hues; it says nothing about contrast. Check any text-on-background pair against the contrast checker before shipping it.
Hex for anything going into a design tool, HSL when you want to adjust lightness by hand, and OKLCH when you need two colours to look equally light; it is the only one of the four where that number means what you expect.