Analogous
Colors pulled from neighboring slices of the wheel. Calm, cohesive, low tension: teal into green into yellow-green.
See it
What it is
An analogous scheme takes three to five hues from a single stretch of the wheel, usually inside a 60 degree arc: teal, green, yellow-green, or magenta, red, orange. Because no two picks are far enough apart to argue, the whole set reads as one atmosphere. Nature runs on this: a forest canopy, a sunset, the sea. Monet's haystacks are basically an analogous study repeated thirty times.
Reach for it when mood matters more than hierarchy. Gradients, hero backgrounds, illustration, and ambient dashboards all want this. It is also one option for sequential data-viz ramps, not the rule: plenty of good sequential scales are single-hue, and what actually makes them work is an ordered, evenly spaced lightness progression, whether or not the hue moves. Pick one hue as the clear dominant and let the neighbors do supporting work; giving all four equal airtime turns it into mush.
Gotcha: an analogous palette has no natural accent. Everything is equally quiet, so call-to-action buttons vanish into the background. The standard cure is to break the family on purpose with one out-of-arc color (often the complement of your base) or a hard neutral, reserved for the single thing you want clicked. And build all your separation from lightness, since hues this close cannot separate anything on their own.
Ask AI for it
Use an analogous color scheme: take the current primary hue as the center of a total 60 degree arc and pick five hues across it, at H minus 30, H minus 15, H, H plus 15, and H plus 30 degrees. Say which color space the angles are in. Keep the center hue dominant across large surfaces and use the neighbors only for supporting fills and gradients. Build separation with lightness rather than hue: spread the set across at least 40 OKLCH lightness points. Then add exactly one out-of-family accent (the complement of the base hue, or a hard neutral) and reserve it for the primary action. Return OKLCH and hex with each color's role labeled.