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Colour

#21B4FF

  • #21B4FF
  • Blue
  • Dark
  • Nearest: Deep skyblue

#21B4FF is a blue with RGB values 33, 180, 255 and HSL 200°, 100%, 56%. It is a dark colour, so black text on it reaches 9:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#21B4FF#21B4FF
HEX#21B4FF
RGBrgb(33, 180, 255)
RGB (0–1)0.1294, 0.7059, 1
RGB percentages12.9%, 70.6%, 100%
HSLhsl(200.3, 100%, 56.5%)
HSV / HSBhsv(200.3, 87.1%, 100%)
CMYK87.1%, 29.4%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,209,023
CSS custom property--colour: #21B4FF;

Brightness & contrast

Relative luminance0.40186WCAG 2.x, 0 is black and 1 is white
Perceived brightness163.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.04:1
Contrast with white2.32:1WCAG normal text: Fail
Contrast with black9.04:1WCAG normal text: AAA
Greyscale equivalent#9A9A9A
Inverted#DE4B00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#90B5FFno red cones; affects about 1% of men; ΔE 18.6 from the original
Deuteranopia#73A1FEno green cones; the most common form, about 1% of men; ΔE 21.9 from the original
Tritanopia#00C7CEno blue cones; rare, and affects men and women equally; ΔE 42.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.32:1WCAG large text: Fail
Contrast with black, large text9.04:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 8.9Light skyblue · ΔE 21.2Cornflower blue · ΔE 21.5Steel blue · ΔE 23.7Sky blue · ΔE 27.9Dodgerblue · ΔE 28.1
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 8.92, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF6C21
Analogous#21FFDB, #2145FF
Triadic#FF21B4, #B4FF21
Split complementary#FF2145, #FFDB21
Tetradic#DB21FF, #FF6C21, #45FF21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EDF9FF
Lighter +30%#BAE8FF
Lighter +20%#87D6FF
Lighter +10%#54C5FF
Darker −10%#009DED
Darker −20%#007BBA
Darker −30%#005987
Darker −40%#003854
More saturated +25%#21B4FF
Less saturated −25%#3DABE3

Channel breakdown

R33
G180
B255
Red33 (12.9%)
Green180 (70.6%)
Blue255 (100%)
Hue200.27°
Saturation (HSL)100%
Lightness56.47%
Dominant channelBlue
Hex per channelR 21 · G B4 · B FF

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Every value on this page was computed from “21b4ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.