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Recognised as Colour

#21C8F9

  • #21C8F9
  • Cyan
  • Dark
  • Nearest: Deep skyblue

#21C8F9 is a cyan with RGB values 33, 200, 249 and HSL 194°, 95%, 55%. It is a dark colour, so black text on it reaches 10.7:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#21C8F9#21C8F9
HEX#21C8F9
RGBrgb(33, 200, 249)
RGB (0–1)0.1294, 0.7843, 0.9765
RGB percentages12.9%, 78.4%, 97.6%
HSLhsl(193.6, 94.7%, 55.3%)
HSV / HSBhsv(193.6, 86.7%, 97.6%)
CMYK86.7%, 19.7%, 0%, 2.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,214,137
CSS custom property--colour: #21C8F9;

Brightness & contrast

Relative luminance0.48471WCAG 2.x, 0 is black and 1 is white
Perceived brightness175.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 10.69:1
Contrast with white1.96:1WCAG normal text: Fail
Contrast with black10.69:1WCAG normal text: AAA
Greyscale equivalent#A8A8A8
Inverted#DE3706

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#ADC4FBno red cones; affects about 1% of men; ΔE 28.7 from the original
Deuteranopia#92B1F8no green cones; the most common form, about 1% of men; ΔE 30.6 from the original
Tritanopia#00D7D8no blue cones; rare, and affects men and women equally; ΔE 29.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.96:1WCAG large text: Fail
Contrast with black, large text10.69:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 9.5Light skyblue · ΔE 14.9Sky blue · ΔE 16.8Dark turquoise · ΔE 27.5Light blue · ΔE 28.2Steel blue · ΔE 29.8
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 9.48, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#F95221
Analogous#21F9BE, #215CF9
Triadic#F921C8, #C8F921
Split complementary#F9215C, #F9BE21
Tetradic#BE21F9, #F95221, #5CF921

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#E8F9FE
Lighter +30%#B6EDFD
Lighter +20%#84E1FC
Lighter +10%#53D4FA
Darker −10%#06AFE1
Darker −20%#0589AF
Darker −30%#03627E
Darker −40%#023B4C
More saturated +25%#1BCBFF
Less saturated −25%#3EB8DD

Channel breakdown

R33
G200
B249
Red33 (12.9%)
Green200 (78.4%)
Blue249 (97.6%)
Hue193.61°
Saturation (HSL)94.74%
Lightness55.29%
Dominant channelBlue
Hex per channelR 21 · G C8 · B F9

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Every value on this page was computed from “21c8f9” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.