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Recognised as Colour

#21A5DA

  • #21A5DA
  • Cyan
  • Dark
  • Nearest: Deep skyblue

#21A5DA is a cyan with RGB values 33, 165, 218 and HSL 197°, 74%, 49%. It is a dark colour, so black text on it reaches 7.5:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#21A5DA#21A5DA
HEX#21A5DA
RGBrgb(33, 165, 218)
RGB (0–1)0.1294, 0.6471, 0.8549
RGB percentages12.9%, 64.7%, 85.5%
HSLhsl(197.2, 73.7%, 49.2%)
HSV / HSBhsv(197.2, 84.9%, 85.5%)
CMYK84.9%, 24.3%, 0%, 14.5%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,205,146
CSS custom property--colour: #21A5DA;

Brightness & contrast

Relative luminance0.32296WCAG 2.x, 0 is black and 1 is white
Perceived brightness147.4 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.46:1
Contrast with white2.82:1WCAG normal text: Fail
Contrast with black7.46:1WCAG normal text: AAA
Greyscale equivalent#8D8D8D
Inverted#DE5A25

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#8AA3DDno red cones; affects about 1% of men; ΔE 21.6 from the original
Deuteranopia#7293D9no green cones; the most common form, about 1% of men; ΔE 23.1 from the original
Tritanopia#00B3B7no blue cones; rare, and affects men and women equally; ΔE 31.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.82:1WCAG large text: Fail
Contrast with black, large text7.46:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 11.1Steel blue · ΔE 16.4Light skyblue · ΔE 18.5Sky blue · ΔE 21.7Cornflower blue · ΔE 28Cadetblue · ΔE 29.3
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 11.13, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DA5621
Analogous#21DAB2, #2149DA
Triadic#DA21A5, #A5DA21
Split complementary#DA2149, #DAB221
Tetradic#B221DA, #DA5621, #49DA21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#CFECF8
Lighter +30%#A3DBF1
Lighter +20%#77C9EA
Lighter +10%#4AB8E4
Darker −10%#1A83AE
Darker −20%#146281
Darker −30%#0D4055
Darker −40%#061F29
More saturated +25%#02B2F9
Less saturated −25%#4098BB

Channel breakdown

R33
G165
B218
Red33 (12.9%)
Green165 (64.7%)
Blue218 (85.5%)
Hue197.19°
Saturation (HSL)73.71%
Lightness49.22%
Dominant channelBlue
Hex per channelR 21 · G A5 · B DA

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Every value on this page was computed from “21a5da” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.