Denim (#1560BD) is a medium, highly saturated blue hue. Denim blue is a medium blue modelled on faded jeans; casual and approachable.
In RGB it is made of 21 red, 96 green and 189 blue. Its HSL hue angle is 213° with 80% saturation and 41% lightness, while its perceptual OKLCH lightness is 50% with a chroma of 0.162. For print, a starting CMYK mix is 89% cyan, 49% magenta, 0% yellow and 26% black.
As a text color on white, Denim has a contrast ratio of 6.1:1, which passes WCAG AA for normal text. On black it reaches 3.44:1 and passes AA only for large text. If you use Denim as a background, put white text on it. The APCA lightness contrast is Lc 24 for black text and Lc -85 for white text.
Its perceptual complement is #845A00, close to brown. Colors that look most similar are sapphire, royal blue, cobalt blue. It looks fairly similar to people with red-green color blindness (ΔE 2), so its meaning mostly survives.