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Recognised as Colour

#21C2AB

  • #21C2AB
  • Cyan
  • Dark
  • Nearest: Light seagreen

#21C2AB is a cyan with RGB values 33, 194, 171 and HSL 171°, 71%, 45%. It is a dark colour, so black text on it reaches 9.4:1 contrast (AAA for normal text). The nearest named colour is Light seagreen.

Colour values

#21C2AB#21C2AB
HEX#21C2AB
RGBrgb(33, 194, 171)
RGB (0–1)0.1294, 0.7608, 0.6706
RGB percentages12.9%, 76.1%, 67.1%
HSLhsl(171.4, 70.9%, 44.5%)
HSV / HSBhsv(171.4, 83%, 76.1%)
CMYK83%, 0%, 11.9%, 23.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,212,523
CSS custom property--colour: #21C2AB;

Brightness & contrast

Relative luminance0.41847WCAG 2.x, 0 is black and 1 is white
Perceived brightness160.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.37:1
Contrast with white2.24:1WCAG normal text: Fail
Contrast with black9.37:1WCAG normal text: AAA
Greyscale equivalent#9E9E9E
Inverted#DE3D54

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B9B6AAno red cones; affects about 1% of men; ΔE 43.7 from the original
Deuteranopia#A5A7ADno green cones; the most common form, about 1% of men; ΔE 44.9 from the original
Tritanopia#00C5BBno blue cones; rare, and affects men and women equally; ΔE 7.4 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.24:1WCAG large text: Fail
Contrast with black, large text9.37:1WCAG large text: AAA

Named colours

Light seagreen · ΔE 10.8Medium aquamarine · ΔE 11Turquoise · ΔE 11.4Medium turquoise · ΔE 12.7Dark turquoise · ΔE 15.3Aquamarine · ΔE 23.2
Nearest named CSS colourLight seagreen (#20B2AA)ΔE 10.75, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#C22138
Analogous#21C25B, #2188C2
Triadic#AB21C2, #C2AB21
Split complementary#C22188, #C25B21
Tetradic#5B21C2, #C22138, #88C221

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#BBF4EC
Lighter +30%#90ECDF
Lighter +20%#64E5D2
Lighter +10%#39DDC6
Darker −10%#1A9685
Darker −20%#126B5E
Darker −30%#0B3F38
Darker −40%#031411
More saturated +25%#05DEBF
Less saturated −25%#3DA697

Channel breakdown

R33
G194
B171
Red33 (12.9%)
Green194 (76.1%)
Blue171 (67.1%)
Hue171.43°
Saturation (HSL)70.93%
Lightness44.51%
Dominant channelGreen
Hex per channelR 21 · G C2 · B AB

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Every value on this page was computed from “21c2ab” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.