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Recognised as Colour

#21A6FF

  • #21A6FF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#21A6FF is a blue with RGB values 33, 166, 255 and HSL 204°, 100%, 56%. It is a dark colour, so black text on it reaches 8:1 contrast (AAA for normal text). The nearest named colour is Cornflower blue.

Colour values

#21A6FF#21A6FF
HEX#21A6FF
RGBrgb(33, 166, 255)
RGB (0–1)0.1294, 0.651, 1
RGB percentages12.9%, 65.1%, 100%
HSLhsl(204.1, 100%, 56.5%)
HSV / HSBhsv(204.1, 87.1%, 100%)
CMYK87.1%, 34.9%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,205,439
CSS custom property--colour: #21A6FF;

Brightness & contrast

Relative luminance0.34816WCAG 2.x, 0 is black and 1 is white
Perceived brightness154.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.96:1
Contrast with white2.64:1WCAG normal text: Fail
Contrast with black7.96:1WCAG normal text: AAA
Greyscale equivalent#909090
Inverted#DE5900

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7BAAFFno red cones; affects about 1% of men; ΔE 12.9 from the original
Deuteranopia#5B97FDno green cones; the most common form, about 1% of men; ΔE 15.2 from the original
Tritanopia#00BCC6no blue cones; rare, and affects men and women equally; ΔE 49.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.64:1WCAG large text: Fail
Contrast with black, large text7.96:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 13.3Dodgerblue · ΔE 17.3Deep skyblue · ΔE 19.7Steel blue · ΔE 25Light skyblue · ΔE 29.8Royal blue · ΔE 36
Nearest named CSS colourCornflower blue (#6495ED)ΔE 13.33, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF7A21
Analogous#21FFE9, #2137FF
Triadic#FF21A6, #A6FF21
Split complementary#FF2137, #FFE921
Tetradic#E921FF, #FF7A21, #37FF21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EDF8FF
Lighter +30%#BAE3FF
Lighter +20%#87CFFF
Lighter +10%#54BAFF
Darker −10%#008EED
Darker −20%#006FBA
Darker −30%#005187
Darker −40%#003254
More saturated +25%#21A6FF
Less saturated −25%#3DA1E3

Channel breakdown

R33
G166
B255
Red33 (12.9%)
Green166 (65.1%)
Blue255 (100%)
Hue204.05°
Saturation (HSL)100%
Lightness56.47%
Dominant channelBlue
Hex per channelR 21 · G A6 · B FF

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Every value on this page was computed from “21a6ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.