Colour

#178BFD

#178BFD
Blue
Dark
Nearest: Dodgerblue

#178BFD is a blue with RGB values 23, 139, 253 and HSL 210°, 98%, 54%. It is a dark colour, so black text on it reaches 6.1:1 contrast (AA for normal text). The nearest named colour is Dodgerblue.

Colour values

#178BFD#178BFD

HEX#178BFD

RGBrgb(23, 139, 253)

RGB (0–1)0.0902, 0.5451, 0.9922

RGB percentages9%, 54.5%, 99.2%

HSLhsl(209.7, 98.3%, 54.1%)

HSV / HSBhsv(209.7, 90.9%, 99.2%)

CMYK90.9%, 45.1%, 0%, 0.8%≈naive device-independent conversion; real print needs an ICC profile

24-bit integer1,543,165

CSS custom property--colour: #178BFD;

Brightness & contrast

Relative luminance0.25739WCAG 2.x, 0 is black and 1 is white

Perceived brightness137.1 of 255ITU-R BT.601 weighting

Light or darkDark

Best text colour on this backgroundBlackcontrast 6.15:1

Contrast with white3.42:1WCAG normal text: Fail

Contrast with black6.15:1WCAG normal text: AA

Greyscale equivalent#7B7B7B

Inverted#E87402

Colour vision & accessibility

Normal vision Protanopia Deuteranopia Tritanopia

Protanopia#4C95FFno red cones; affects about 1% of men; ΔE 6.9 from the original

Deuteranopia#0582FBno green cones; the most common form, about 1% of men; ΔE 6 from the original

Tritanopia#00A7B8no blue cones; rare, and affects men and women equally; ΔE 62 from the original

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

Contrast with white, large text3.42:1WCAG large text: AA

Contrast with black, large text6.15:1WCAG large text: AAA

Named colours

Dodgerblue · ΔE 2.9 Cornflower blue · ΔE 16.3 Royal blue · ΔE 17.5 Slate blue · ΔE 28.1 Medium purple · ΔE 29.1 Medium slateblue · ΔE 29.7

Nearest named CSS colourDodgerblue (#1E90FF)ΔE 2.9, a close match

Hue familyblue

CSS keyword usableNo exact keyword

Colour harmonies

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

Complementary#FD8917

Analogous#17FDFC, #1718FD

Triadic#FD178B, #8BFD17

Split complementary#FD1718, #FDFC17

Tetradic#FC17FD, #FD8917, #18FD17

Tints, shades & saturation

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

Lighter +40%#E1F0FF

Lighter +30%#AFD7FE

Lighter +20%#7CBEFE

Lighter +10%#4AA4FD

Darker −10%#0271DF

Darker −20%#0158AD

Darker −30%#013E7A

Darker −40%#012447

More saturated +25%#158BFF

Less saturated −25%#348BE0

Channel breakdown

R23

G139

B253

Red23 (9%)

Green139 (54.5%)

Blue253 (99.2%)

Hue209.74°

Saturation (HSL)98.29%

Lightness54.12%

Dominant channelBlue

Hex per channelR 17 · G 8B · B FD

Keep nerding

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#178BFD

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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