Vectorscope
The vectorscope shows color as a round graph: direction is the hue and distance from the center is saturation. The further a point sits outward, the stronger that color. It's the go-to scope for checking color and skin tones.
Neutral grey sits in the center, so the more your signal fans outward, the more saturated your image. There's a special skin tone line where healthy skin tones should roughly fall, a handy check for portraits. In DaVinci Resolve, Premiere Pro and Final Cut Pro you find the vectorscope with your scopes. Tip: use it to spot a color cast, because that pulls the whole image lopsided toward one side.
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The presets on this site set these adjustments up for you as a starting point, which you then fine-tune to taste.