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Recognised as Colour

#66BDB4

  • #66BDB4
  • Cyan
  • Dark
  • Nearest: Light seagreen

#66BDB4 is a cyan with RGB values 102, 189, 180 and HSL 174°, 40%, 57%. It is a dark colour, so black text on it reaches 9.5:1 contrast (AAA for normal text). The nearest named colour is Light seagreen.

Colour values

#66BDB4#66BDB4
HEX#66BDB4
RGBrgb(102, 189, 180)
RGB (0–1)0.4, 0.7412, 0.7059
RGB percentages40%, 74.1%, 70.6%
HSLhsl(173.8, 39.7%, 57.1%)
HSV / HSBhsv(173.8, 46%, 74.1%)
CMYK46%, 0%, 4.8%, 25.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,733,236
CSS custom property--colour: #66BDB4;

Brightness & contrast

Relative luminance0.42515WCAG 2.x, 0 is black and 1 is white
Perceived brightness166.7 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 9.5:1
Contrast with white2.21:1WCAG normal text: Fail
Contrast with black9.5:1WCAG normal text: AAA
Greyscale equivalent#AAAAAA
Inverted#99424B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B5B5B4no red cones; affects about 1% of men; ΔE 28.7 from the original
Deuteranopia#A6AAB5no green cones; the most common form, about 1% of men; ΔE 29.4 from the original
Tritanopia#3DC1BAno blue cones; rare, and affects men and women equally; ΔE 8.7 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.21:1WCAG large text: Fail
Contrast with black, large text9.5:1WCAG large text: AAA

Named colours

Light seagreen · ΔE 10.9Medium turquoise · ΔE 11.6Cadetblue · ΔE 13.9Dark turquoise · ΔE 15.8Medium aquamarine · ΔE 16.1Turquoise · ΔE 18.6
Nearest named CSS colourLight seagreen (#20B2AA)ΔE 10.92, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#BD666F
Analogous#66BD88, #669BBD
Triadic#B466BD, #BDB466
Split complementary#BD669B, #BD8966
Tetradic#8866BD, #BD666F, #9ABD66

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F5FAFA
Lighter +30%#D1EBE8
Lighter +20%#ADDCD7
Lighter +10%#8ACCC5
Darker −10%#48A89E
Darker −20%#39847C
Darker −30%#2A605B
Darker −40%#1A3D39
More saturated +25%#4BD8CA
Less saturated −25%#81A29E

Channel breakdown

R102
G189
B180
Red102 (40%)
Green189 (74.1%)
Blue180 (70.6%)
Hue173.79°
Saturation (HSL)39.73%
Lightness57.06%
Dominant channelGreen
Hex per channelR 66 · G BD · B B4

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Every value on this page was computed from “66bdb4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.