Analogous palette generator
Nearest named colour: royalblue
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Gives the hues 30 degrees either side of yours. Analogous schemes are the most reliably harmonious of the classical constructions, because neighbouring hues never fight.
How to use the analogous palette generator
The strength and the weakness are the same thing: analogous colours agree, which makes the palette calm and makes nothing stand out. A pure analogous scheme has no natural accent, so anything that needs attention has to earn it through lightness or size rather than hue. The usual fix is to break the scheme deliberately with one colour from across the wheel. Nature is the standard reference here. A leaf ranges through yellows and greens and reads as one thing, which is exactly the effect an analogous palette produces.
Questions
Hues adjacent on the wheel, typically 30 degrees apart. They never clash because they share so much.
Because nothing contrasts. Vary lightness, or add one colour from across the wheel as an accent.
Three is the classic. Five works if the lightness varies enough to tell them apart.
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.