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Recognised as Colour

#21A1DC

  • #21A1DC
  • Cyan
  • Dark
  • Nearest: Deep skyblue

#21A1DC is a cyan with RGB values 33, 161, 220 and HSL 199°, 74%, 50%. It is a dark colour, so black text on it reaches 7.2:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#21A1DC#21A1DC
HEX#21A1DC
RGBrgb(33, 161, 220)
RGB (0–1)0.1294, 0.6314, 0.8627
RGB percentages12.9%, 63.1%, 86.3%
HSLhsl(198.9, 73.9%, 49.6%)
HSV / HSBhsv(198.9, 85%, 86.3%)
CMYK85%, 26.8%, 0%, 13.7%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,204,124
CSS custom property--colour: #21A1DC;

Brightness & contrast

Relative luminance0.3098WCAG 2.x, 0 is black and 1 is white
Perceived brightness145.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.2:1
Contrast with white2.92:1WCAG normal text: Fail
Contrast with black7.2:1WCAG normal text: AAA
Greyscale equivalent#8A8A8A
Inverted#DE5E23

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#84A0DFno red cones; affects about 1% of men; ΔE 19.5 from the original
Deuteranopia#6C90DBno green cones; the most common form, about 1% of men; ΔE 21.2 from the original
Tritanopia#00B0B5no blue cones; rare, and affects men and women equally; ΔE 34.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.92:1WCAG large text: Fail
Contrast with black, large text7.2:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 11.8Steel blue · ΔE 14.9Light skyblue · ΔE 20.3Cornflower blue · ΔE 24.1Sky blue · ΔE 24.6Light slate grey · ΔE 30.6
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 11.78, a distinctly different colour
Hue familycyan
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#DC5C21
Analogous#21DCBA, #2143DC
Triadic#DC21A1, #A1DC21
Split complementary#DC2143, #DCBA21
Tetradic#BA21DC, #DC5C21, #43DC21

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D1ECF8
Lighter +30%#A5D9F1
Lighter +20%#78C7EB
Lighter +10%#4CB4E4
Darker −10%#1A81B0
Darker −20%#146083
Darker −30%#0D4057
Darker −40%#061F2B
More saturated +25%#01ADFC
Less saturated −25%#4195BC

Channel breakdown

R33
G161
B220
Red33 (12.9%)
Green161 (63.1%)
Blue220 (86.3%)
Hue198.93°
Saturation (HSL)73.91%
Lightness49.61%
Dominant channelBlue
Hex per channelR 21 · G A1 · B DC

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Every value on this page was computed from “21a1dc” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.