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Recognised as Colour

#21AECF

  • #21AECF
  • Cyan
  • Dark
  • Nearest: Sky blue

#21AECF is a cyan with RGB values 33, 174, 207 and HSL 191°, 73%, 47%. It is a dark colour, so black text on it reaches 8:1 contrast (AAA for normal text). The nearest named colour is Sky blue.

Colour values

#21AECF#21AECF
HEX#21AECF
RGBrgb(33, 174, 207)
RGB (0–1)0.1294, 0.6824, 0.8118
RGB percentages12.9%, 68.2%, 81.2%
HSLhsl(191.4, 72.5%, 47.1%)
HSV / HSBhsv(191.4, 84.1%, 81.2%)
CMYK84.1%, 15.9%, 0%, 18.8%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,207,439
CSS custom property--colour: #21AECF;

Brightness & contrast

Relative luminance0.351WCAG 2.x, 0 is black and 1 is white
Perceived brightness151.6 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.02:1
Contrast with white2.62:1WCAG normal text: Fail
Contrast with black8.02:1WCAG normal text: AAA
Greyscale equivalent#929292
Inverted#DE5130

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#99A9D1no red cones; affects about 1% of men; ΔE 27.9 from the original
Deuteranopia#8399CFno green cones; the most common form, about 1% of men; ΔE 29.7 from the original
Tritanopia#00B9B9no blue cones; rare, and affects men and women equally; ΔE 21.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.62:1WCAG large text: Fail
Contrast with black, large text8.02:1WCAG large text: AAA

Named colours

Sky blue · ΔE 17.1Deep skyblue · ΔE 18.2Light skyblue · ΔE 19.2Cadetblue · ΔE 20.4Dark turquoise · ΔE 22.9Dark cyan · ΔE 23.4
Nearest named CSS colourSky blue (#87CEEB)ΔE 17.08, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#CF4221
Analogous#21CF99, #2157CF
Triadic#CF21AE, #AECF21
Split complementary#CF2157, #CF9921
Tetradic#9921CF, #CF4221, #57CF21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#C6EDF6
Lighter +30%#9ADFEF
Lighter +20%#6ED1E8
Lighter +10%#42C3E1
Darker −10%#1A89A3
Darker −20%#136477
Darker −30%#0C3F4B
Darker −40%#051A1F
More saturated +25%#03C1ED
Less saturated −25%#3F9BB1

Channel breakdown

R33
G174
B207
Red33 (12.9%)
Green174 (68.2%)
Blue207 (81.2%)
Hue191.38°
Saturation (HSL)72.5%
Lightness47.06%
Dominant channelBlue
Hex per channelR 21 · G AE · B CF

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Every value on this page was computed from “21aecf” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.