Azure (#007FFF) is a medium, highly saturated blue hue. Azure is the bright blue of a cloudless sky, halfway between blue and cyan.
In RGB it is made of 0 red, 127 green and 255 blue. Its HSL hue angle is 210° with 100% saturation and 50% lightness, while its perceptual OKLCH lightness is 61% with a chroma of 0.212. For print, a starting CMYK mix is 100% cyan, 50% magenta, 0% yellow and 0% black.
As a text color on white, Azure has a contrast ratio of 3.83:1, which passes AA only for large text and UI parts. On black it reaches 5.48:1 and passes AA for normal text. If you use Azure as a background, put black (or very dark) text on it. The APCA lightness contrast is Lc 39 for black text and Lc -70 for white text.
Its perceptual complement is #AF7800, close to caramel. Colors that look most similar are royal blue, steel blue, denim. It looks fairly similar to people with red-green color blindness (ΔE 2), so its meaning mostly survives.