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Recognised as Colour

#66B5A1

  • #66B5A1
  • Cyan
  • Dark
  • Nearest: Light seagreen

#66B5A1 is a cyan with RGB values 102, 181, 161 and HSL 165°, 35%, 55%. It is a dark colour, so black text on it reaches 8.7:1 contrast (AAA for normal text). The nearest named colour is Light seagreen.

Colour values

#66B5A1#66B5A1
HEX#66B5A1
RGBrgb(102, 181, 161)
RGB (0–1)0.4, 0.7098, 0.6314
RGB percentages40%, 71%, 63.1%
HSLhsl(164.8, 34.8%, 55.5%)
HSV / HSBhsv(164.8, 43.6%, 71%)
CMYK43.6%, 0%, 11%, 29%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,731,169
CSS custom property--colour: #66B5A1;

Brightness & contrast

Relative luminance0.38446WCAG 2.x, 0 is black and 1 is white
Perceived brightness159 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.69:1
Contrast with white2.42:1WCAG normal text: Fail
Contrast with black8.69:1WCAG normal text: AAA
Greyscale equivalent#A3A3A3
Inverted#994A5E

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#B0ACA0no red cones; affects about 1% of men; ΔE 28.8 from the original
Deuteranopia#A3A3A2no green cones; the most common form, about 1% of men; ΔE 29.1 from the original
Tritanopia#4AB7AFno 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 text2.42:1WCAG large text: Fail
Contrast with black, large text8.69:1WCAG large text: AAA

Named colours

Light seagreen · ΔE 12.5Medium aquamarine · ΔE 13.1Cadetblue · ΔE 15.6Medium turquoise · ΔE 16.1Dark seagreen · ΔE 16.7Dark cyan · ΔE 19.9
Nearest named CSS colourLight seagreen (#20B2AA)ΔE 12.51, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#B5667A
Analogous#66B57A, #66A2B5
Triadic#A166B5, #B5A166
Split complementary#B566A1, #B57A66
Tetradic#7A66B5, #B5667A, #A2B566

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#EFF8F5
Lighter +30%#CDE7E0
Lighter +20%#ABD6CB
Lighter +10%#88C6B6
Darker −10%#4C9C88
Darker −20%#3B7A6A
Darker −30%#2A584C
Darker −40%#1A352E
More saturated +25%#4AD1AF
Less saturated −25%#829993

Channel breakdown

R102
G181
B161
Red102 (40%)
Green181 (71%)
Blue161 (63.1%)
Hue164.81°
Saturation (HSL)34.8%
Lightness55.49%
Dominant channelGreen
Hex per channelR 66 · G B5 · B A1

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Every value on this page was computed from “66b5a1” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.