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Recognised as Colour

#21BB90

  • #21BB90
  • Cyan
  • Dark
  • Nearest: Medium aquamarine

#21BB90 is a cyan with RGB values 33, 187, 144 and HSL 163°, 70%, 43%. It is a dark colour, so black text on it reaches 8.6:1 contrast (AAA for normal text). The nearest named colour is Medium aquamarine.

Colour values

#21BB90#21BB90
HEX#21BB90
RGBrgb(33, 187, 144)
RGB (0–1)0.1294, 0.7333, 0.5647
RGB percentages12.9%, 73.3%, 56.5%
HSLhsl(163.2, 70%, 43.1%)
HSV / HSBhsv(163.2, 82.4%, 73.3%)
CMYK82.4%, 0%, 23%, 26.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,210,704
CSS custom property--colour: #21BB90;

Brightness & contrast

Relative luminance0.37878WCAG 2.x, 0 is black and 1 is white
Perceived brightness152.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.58:1
Contrast with white2.45:1WCAG normal text: Fail
Contrast with black8.58:1WCAG normal text: AAA
Greyscale equivalent#979797
Inverted#DE446F

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B6AD8Eno red cones; affects about 1% of men; ΔE 46.8 from the original
Deuteranopia#A4A093no green cones; the most common form, about 1% of men; ΔE 47.6 from the original
Tritanopia#00BCAFno blue cones; rare, and affects men and women equally; ΔE 17 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.45:1WCAG large text: Fail
Contrast with black, large text8.58:1WCAG large text: AAA

Named colours

Medium aquamarine · ΔE 12.9Medium seagreen · ΔE 13.5Sea green · ΔE 20.5Light seagreen · ΔE 20.6Turquoise · ΔE 20.6Medium turquoise · ΔE 24
Nearest named CSS colourMedium aquamarine (#66CDAA)ΔE 12.9, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BB214C
Analogous#21BB43, #2199BB
Triadic#9021BB, #BB9021
Split complementary#BB2199, #BB4321
Tetradic#4321BB, #BB214C, #99BB21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#B6F2E1
Lighter +30%#8BEAD0
Lighter +20%#5FE3BE
Lighter +10%#34DBAC
Darker −10%#19906F
Darker −20%#12644D
Darker −30%#0A392C
Darker −40%#020E0A
More saturated +25%#06D69C
Less saturated −25%#3DA084

Channel breakdown

R33
G187
B144
Red33 (12.9%)
Green187 (73.3%)
Blue144 (56.5%)
Hue163.25°
Saturation (HSL)70%
Lightness43.14%
Dominant channelGreen
Hex per channelR 21 · G BB · B 90

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Every value on this page was computed from “21bb90” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.