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Recognised as Colour

#51FFFF

  • #51FFFF
  • Cyan
  • Light
  • Nearest: Aqua

#51FFFF is a cyan with RGB values 81, 255, 255 and HSL 180°, 100%, 66%. It is a light colour, so black text on it reaches 17.1:1 contrast (AAA for normal text). The nearest named colour is Aqua.

Colour values

#51FFFF#51FFFF
HEX#51FFFF
RGBrgb(81, 255, 255)
RGB (0–1)0.3176, 1, 1
RGB percentages31.8%, 100%, 100%
HSLhsl(180, 100%, 65.9%)
HSV / HSBhsv(180, 68.2%, 100%)
CMYK68.2%, 0%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,373,951
CSS custom property--colour: #51FFFF;

Brightness & contrast

Relative luminance0.80489WCAG 2.x, 0 is black and 1 is white
Perceived brightness218 of 255ITU-R BT.601 weighting
Light or darkLight
Best text colour on this backgroundBlackcontrast 17.1:1
Contrast with white1.23:1WCAG normal text: Fail
Contrast with black17.1:1WCAG normal text: AAA
Greyscale equivalent#DADADA
Inverted#AE0000

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#EFF3FFno red cones; affects about 1% of men; ΔE 44.5 from the original
Deuteranopia#D5E0FFno green cones; the most common form, about 1% of men; ΔE 45.6 from the original
Tritanopia#00FFFFno blue cones; rare, and affects men and women equally; ΔE 5.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text1.23:1WCAG large text: Fail
Contrast with black, large text17.1:1WCAG large text: AAA

Named colours

Aqua · ΔE 5.3Cyan · ΔE 5.3Turquoise · ΔE 13.9Medium turquoise · ΔE 16.7Dark turquoise · ΔE 16.9Aquamarine · ΔE 22.7
Nearest named CSS colourAqua (#00FFFF)ΔE 5.34, clearly different but related
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF5151
Analogous#51FFA8, #51A8FF
Triadic#FF51FF, #FFFF51
Split complementary#FF51A8, #FFA851
Tetradic#A851FF, #FF5151, #A8FF51

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#EAFFFF
Lighter +20%#B7FFFF
Lighter +10%#84FFFF
Darker −10%#1EFFFF
Darker −20%#00EAEA
Darker −30%#00B7B7
Darker −40%#008484
More saturated +25%#51FFFF
Less saturated −25%#67E9E9

Channel breakdown

R81
G255
B255
Red81 (31.8%)
Green255 (100%)
Blue255 (100%)
Hue180°
Saturation (HSL)100%
Lightness65.88%
Dominant channelGreen and Blue
Hex per channelR 51 · G FF · B FF

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Every value on this page was computed from “51ffff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.