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Recognised as Colour

#21ABCB

  • #21ABCB
  • Cyan
  • Dark
  • Nearest: Sky blue

#21ABCB is a cyan with RGB values 33, 171, 203 and HSL 191°, 72%, 46%. It is a dark colour, so black text on it reaches 7.8:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#21ABCB#21ABCB
HEX#21ABCB
RGBrgb(33, 171, 203)
RGB (0–1)0.1294, 0.6706, 0.7961
RGB percentages12.9%, 67.1%, 79.6%
HSLhsl(191.3, 72%, 46.3%)
HSV / HSBhsv(191.3, 83.7%, 79.6%)
CMYK83.7%, 15.8%, 0%, 20.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,206,667
CSS custom property--colour: #21ABCB;

Brightness & contrast

Relative luminance0.33761WCAG 2.x, 0 is black and 1 is white
Perceived brightness149 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.75:1
Contrast with white2.71:1WCAG normal text: Fail
Contrast with black7.75:1WCAG normal text: AAA
Greyscale equivalent#909090
Inverted#DE5434

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#97A6CDno red cones; affects about 1% of men; ΔE 27.8 from the original
Deuteranopia#8196CBno green cones; the most common form, about 1% of men; ΔE 29.6 from the original
Tritanopia#00B6B5no blue cones; rare, and affects men and women equally; ΔE 21.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.71:1WCAG large text: Fail
Contrast with black, large text7.75:1WCAG large text: AAA

Named colours

Sky blue · ΔE 17.6Deep skyblue · ΔE 19.1Cadetblue · ΔE 19.5Light skyblue · ΔE 19.9Dark cyan · ΔE 22.4Dark turquoise · ΔE 23.2
Nearest named CSS colourSky blue (#87CEEB)ΔE 17.65, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CB4121
Analogous#21CB96, #2156CB
Triadic#CB21AB, #ABCB21
Split complementary#CB2156, #CB9621
Tetradic#9621CB, #CB4121, #56CB21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C3ECF5
Lighter +30%#97DEEE
Lighter +20%#6BD0E7
Lighter +10%#3FC2E0
Darker −10%#1A869F
Darker −20%#136173
Darker −30%#0C3C47
Darker −40%#04171C
More saturated +25%#04BDE8
Less saturated −25%#3E99AE

Channel breakdown

R33
G171
B203
Red33 (12.9%)
Green171 (67.1%)
Blue203 (79.6%)
Hue191.29°
Saturation (HSL)72.03%
Lightness46.27%
Dominant channelBlue
Hex per channelR 21 · G AB · B CB

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