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Colour

#21B3FF

  • #21B3FF
  • Blue
  • Dark
  • Nearest: Deep skyblue

#21B3FF is a blue with RGB values 33, 179, 255 and HSL 201°, 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

#21B3FF#21B3FF
HEX#21B3FF
RGBrgb(33, 179, 255)
RGB (0–1)0.1294, 0.702, 1
RGB percentages12.9%, 70.2%, 100%
HSLhsl(200.5, 100%, 56.5%)
HSV / HSBhsv(200.5, 87.1%, 100%)
CMYK87.1%, 29.8%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,208,767
CSS custom property--colour: #21B3FF;

Brightness & contrast

Relative luminance0.39784WCAG 2.x, 0 is black and 1 is white
Perceived brightness162.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.96:1
Contrast with white2.34:1WCAG normal text: Fail
Contrast with black8.96:1WCAG normal text: AAA
Greyscale equivalent#999999
Inverted#DE4C00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#8EB4FFno red cones; affects about 1% of men; ΔE 18.1 from the original
Deuteranopia#71A1FEno green cones; the most common form, about 1% of men; ΔE 20.9 from the original
Tritanopia#00C6CEno 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 text2.34:1WCAG large text: Fail
Contrast with black, large text8.96:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 9.7Cornflower blue · ΔE 20.8Light skyblue · ΔE 21.8Steel blue · ΔE 23.6Dodgerblue · ΔE 27.4Sky blue · ΔE 28.5
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 9.68, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF6D21
Analogous#21FFDC, #2144FF
Triadic#FF21B3, #B3FF21
Split complementary#FF2144, #FFDC21
Tetradic#DC21FF, #FF6D21, #44FF21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EDF9FF
Lighter +30%#BAE7FF
Lighter +20%#87D6FF
Lighter +10%#54C4FF
Darker −10%#009CED
Darker −20%#007ABA
Darker −30%#005987
Darker −40%#003754
More saturated +25%#21B3FF
Less saturated −25%#3DAAE3

Channel breakdown

R33
G179
B255
Red33 (12.9%)
Green179 (70.2%)
Blue255 (100%)
Hue200.54°
Saturation (HSL)100%
Lightness56.47%
Dominant channelBlue
Hex per channelR 21 · G B3 · B FF

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Every value on this page was computed from “21b3ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.