Colour

#21B274

#21B274
Cyan
Dark
Nearest: Medium seagreen

#21B274 is a cyan with RGB values 33, 178, 116 and HSL 154°, 69%, 41%. It is a dark colour, so black text on it reaches 7.7:1 contrast (AAA for normal text). The nearest named colour is Medium seagreen.

Colour values

#21B274#21B274

HEX#21B274

RGBrgb(33, 178, 116)

RGB (0–1)0.1294, 0.698, 0.4549

RGB percentages12.9%, 69.8%, 45.5%

HSLhsl(154.3, 68.7%, 41.4%)

HSV / HSBhsv(154.3, 81.5%, 69.8%)

CMYK81.5%, 0%, 34.8%, 30.2%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer2,208,372

CSS custom property--colour: #21B274;

Brightness & contrast

Relative luminance0.33425WCAG 2.x, 0 is black and 1 is white

Perceived brightness143 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 7.69:1

Contrast with white2.73:1WCAG normal text: Fail

Contrast with black7.69:1WCAG normal text: AAA

Greyscale equivalent#8F8F8F

Inverted#DE4D8B

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#B0A470no red cones; affects about 1% of men; ΔE 48.2 from the original

Deuteranopia#9F9878no green cones; the most common form, about 1% of men; ΔE 48.5 from the original

Tritanopia#00B1A2no blue cones; rare, and affects men and women equally; ΔE 26.6 from the original

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

Contrast with white, large text2.73:1WCAG large text: Fail

Contrast with black, large text7.69:1WCAG large text: AAA

Named colours

Medium seagreen · ΔE 4 Sea green · ΔE 17.3 Medium aquamarine · ΔE 21.5 Light green · ΔE 27.3 Forest green · ΔE 27.3 Dark seagreen · ΔE 28.5

Nearest named CSS colourMedium seagreen (#3CB371)ΔE 4.05, a close match

Hue familycyan

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#B2215F

Analogous#21B22B, #21A8B2

Triadic#7421B2, #B27421

Split complementary#B221A8, #B22B21

Tetradic#2B21B2, #B2215F, #A8B221

Tints, shades & saturation

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

Lighter +40%#AFF0D4

Lighter +30%#84E8BD

Lighter +20%#59E0A6

Lighter +10%#2ED88F

Darker −10%#198758

Darker −20%#115C3C

Darker −30%#093120

Darker −40%#010604

More saturated +25%#07CC78

Less saturated −25%#3B9870

Channel breakdown

R33

G178

B116

Red33 (12.9%)

Green178 (69.8%)

Blue116 (45.5%)

Hue154.34°

Saturation (HSL)68.72%

Lightness41.37%

Dominant channelGreen

Hex per channelR 21 · G B2 · B 74

Keep nerding

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#21B274

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

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