Recognised as Colour

#21FFFF

#21FFFF
Cyan
Light
Nearest: Aqua

#21FFFF is a cyan with RGB values 33, 255, 255 and HSL 180°, 100%, 56%. It is a light colour, so black text on it reaches 16.8:1 contrast (AAA for normal text). The nearest named colour is Aqua.

Colour values

#21FFFF#21FFFF

HEX#21FFFF

RGBrgb(33, 255, 255)

RGB (0–1)0.1294, 1, 1

RGB percentages12.9%, 100%, 100%

HSLhsl(180, 100%, 56.5%)

HSV / HSBhsv(180, 87.1%, 100%)

CMYK87.1%, 0%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer2,228,223

CSS custom property--colour: #21FFFF;

Brightness & contrast

Relative luminance0.79063WCAG 2.x, 0 is black and 1 is white

Perceived brightness214.3 of 255ITU-R BT.601 weighting

Light or darkLight

Best text colour on this backgroundBlackcontrast 16.81:1

Contrast with white1.25:1WCAG normal text: Fail

Contrast with black16.81:1WCAG normal text: AAA

Greyscale equivalent#D0D0D0

Inverted#DE0000

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#EDF2FFno red cones; affects about 1% of men; ΔE 48.6 from the original

Deuteranopia#D1DDFFno green cones; the most common form, about 1% of men; ΔE 50.2 from the original

Tritanopia#00FFFEno blue cones; rare, and affects men and women equally; ΔE 1.3 from the original

Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning

Contrast with white, large text1.25:1WCAG large text: Fail

Contrast with black, large text16.81:1WCAG large text: AAA

Named colours

Aqua · ΔE 1 Cyan · ΔE 1 Turquoise · ΔE 14.4 Dark turquoise · ΔE 17.5 Medium turquoise · ΔE 18.2 Aquamarine · ΔE 23.7

Nearest named CSS colourAqua (#00FFFF)ΔE 1.01, below the just-noticeable difference

Hue familycyan

CSS keyword usableNo exact keyword

Colour harmonies

base +30°+90°+120°+180°+210°+240°+270°+330°

Complementary#FF2121

Analogous#21FF90, #2190FF

Triadic#FF21FF, #FFFF21

Split complementary#FF2190, #FF9021

Tetradic#9021FF, #FF2121, #90FF21

Tints, shades & saturation

+40%+30%+20%+10%base -10%-20%-30%-40%

Lighter +40%#EDFFFF

Lighter +30%#BAFFFF

Lighter +20%#87FFFF

Lighter +10%#54FFFF

Darker −10%#00EDED

Darker −20%#00BABA

Darker −30%#008787

Darker −40%#005454

More saturated +25%#21FFFF

Less saturated −25%#3DE3E3

Channel breakdown

R33

G255

B255

Red33 (12.9%)

Green255 (100%)

Blue255 (100%)

Hue180°

Saturation (HSL)100%

Lightness56.47%

Dominant channelGreen and Blue

Hex per channelR 21 · G FF · B FF

Keep nerding

Every link below is a page Nerdulator can generate from what it already knows about this value.

#21FFFF

Colour values

Brightness & contrast

Colour vision & accessibility

Named colours

Colour harmonies

Tints, shades & saturation

Channel breakdown

Keep nerding

Harmonies

Lighter and darker

Similar named colours

Nerdulate something else