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Recognised as Colour

#21A8D0

  • #21A8D0
  • Cyan
  • Dark
  • Nearest: Deep skyblue

#21A8D0 is a cyan with RGB values 33, 168, 208 and HSL 194°, 73%, 47%. It is a dark colour, so black text on it reaches 7.6:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#21A8D0#21A8D0
HEX#21A8D0
RGBrgb(33, 168, 208)
RGB (0–1)0.1294, 0.6588, 0.8157
RGB percentages12.9%, 65.9%, 81.6%
HSLhsl(193.7, 72.6%, 47.3%)
HSV / HSBhsv(193.7, 84.1%, 81.6%)
CMYK84.1%, 19.2%, 0%, 18.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,205,904
CSS custom property--colour: #21A8D0;

Brightness & contrast

Relative luminance0.32883WCAG 2.x, 0 is black and 1 is white
Perceived brightness147.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.58:1
Contrast with white2.77:1WCAG normal text: Fail
Contrast with black7.58:1WCAG normal text: AAA
Greyscale equivalent#8E8E8E
Inverted#DE572F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#91A4D2no red cones; affects about 1% of men; ΔE 25.1 from the original
Deuteranopia#7B94D0no green cones; the most common form, about 1% of men; ΔE 27.3 from the original
Tritanopia#00B4B5no blue cones; rare, and affects men and women equally; ΔE 24.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.77:1WCAG large text: Fail
Contrast with black, large text7.58:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 15.4Sky blue · ΔE 18.4Light skyblue · ΔE 18.5Steel blue · ΔE 20.2Cadetblue · ΔE 22.8Dark cyan · ΔE 26.2
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 15.36, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D04921
Analogous#21D0A1, #2150D0
Triadic#D021A8, #A8D021
Split complementary#D02150, #D0A121
Tetradic#A121D0, #D04921, #50D021

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C7EBF6
Lighter +30%#9BDCEF
Lighter +20%#6FCCE8
Lighter +10%#43BDE1
Darker −10%#1A84A4
Darker −20%#136178
Darker −30%#0C3D4C
Darker −40%#051A20
More saturated +25%#03B8EE
Less saturated −25%#3F98B2

Channel breakdown

R33
G168
B208
Red33 (12.9%)
Green168 (65.9%)
Blue208 (81.6%)
Hue193.71°
Saturation (HSL)72.61%
Lightness47.25%
Dominant channelBlue
Hex per channelR 21 · G A8 · B D0

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Every value on this page was computed from “21a8d0” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.