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Colour

#04A9FF

  • #04A9FF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#04A9FF is a blue with RGB values 4, 169, 255 and HSL 201°, 100%, 51%. It is a dark colour, so black text on it reaches 8.1:1 contrast (AAA for normal text). The nearest named colour is Cornflower blue.

Colour values

#04A9FF#04A9FF
HEX#04A9FF
RGBrgb(4, 169, 255)
RGB (0–1)0.0157, 0.6627, 1
RGB percentages1.6%, 66.3%, 100%
HSLhsl(200.6, 100%, 50.8%)
HSV / HSBhsv(200.6, 98.4%, 100%)
CMYK98.4%, 33.7%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer305,663
CSS custom property--colour: #04A9FF;

Brightness & contrast

Relative luminance0.35622WCAG 2.x, 0 is black and 1 is white
Perceived brightness155.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 8.12:1
Contrast with white2.58:1WCAG normal text: Fail
Contrast with black8.12:1WCAG normal text: AAA
Greyscale equivalent#8C8C8C
Inverted#FB5600

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#7FACFFno red cones; affects about 1% of men; ΔE 15.1 from the original
Deuteranopia#5F98FDno green cones; the most common form, about 1% of men; ΔE 18 from the original
Tritanopia#00BEC8no blue cones; rare, and affects men and women equally; ΔE 47.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.58:1WCAG large text: Fail
Contrast with black, large text8.12:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 15.8Deep skyblue · ΔE 16.9Dodgerblue · ΔE 20.2Steel blue · ΔE 24.6Light skyblue · ΔE 28Sky blue · ΔE 35
Nearest named CSS colourCornflower blue (#6495ED)ΔE 15.84, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF5A04
Analogous#04FFD7, #042CFF
Triadic#FF04A9, #A9FF04
Split complementary#FF042C, #FFD704
Tetradic#D704FF, #FF5A04, #2CFF04

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#D0EFFF
Lighter +30%#9DDDFF
Lighter +20%#6ACCFF
Lighter +10%#37BAFF
Darker −10%#0089D0
Darker −20%#00679D
Darker −30%#00466A
Darker −40%#002437
More saturated +25%#04A9FF
Less saturated −25%#239FE0

Channel breakdown

R4
G169
B255
Red4 (1.6%)
Green169 (66.3%)
Blue255 (100%)
Hue200.56°
Saturation (HSL)100%
Lightness50.78%
Dominant channelBlue
Hex per channelR 04 · G A9 · B FF

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Every value on this page was computed from “04a9ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.