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Recognised as Colour

#557BFB

  • #557BFB
  • Blue
  • Dark
  • Nearest: Royal blue

#557BFB is a blue with RGB values 85, 123, 251 and HSL 226°, 95%, 66%. It is a dark colour, so black text on it reaches 5.6:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#557BFB#557BFB
HEX#557BFB
RGBrgb(85, 123, 251)
RGB (0–1)0.3333, 0.4824, 0.9843
RGB percentages33.3%, 48.2%, 98.4%
HSLhsl(226.3, 95.4%, 65.9%)
HSV / HSBhsv(226.3, 66.1%, 98.4%)
CMYK66.1%, 51%, 0%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer5,602,299
CSS custom property--colour: #557BFB;

Brightness & contrast

Relative luminance0.23062WCAG 2.x, 0 is black and 1 is white
Perceived brightness135 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.61:1
Contrast with white3.74:1WCAG normal text: Fail
Contrast with black5.61:1WCAG normal text: AA
Greyscale equivalent#7C7C7C
Inverted#AA8404

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2C8CFFno red cones; affects about 1% of men; ΔE 14.5 from the original
Deuteranopia#007DF8no green cones; the most common form, about 1% of men; ΔE 9.3 from the original
Tritanopia#0099AFno blue cones; rare, and affects men and women equally; ΔE 70.6 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.74:1WCAG large text: AA
Contrast with black, large text5.61:1WCAG large text: AAA

Named colours

Royal blue · ΔE 7.8Medium slateblue · ΔE 14.6Slate blue · ΔE 16.8Dodgerblue · ΔE 18.2Medium purple · ΔE 20.4Cornflower blue · ΔE 26.6
Nearest named CSS colourRoyal blue (#4169E1)ΔE 7.81, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FBD555
Analogous#55CEFB, #8255FB
Triadic#FB557B, #7BFB55
Split complementary#FB8255, #CEFB55
Tetradic#FB55CE, #FBD555, #55FB82

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#EAEFFF
Lighter +20%#B9C8FD
Lighter +10%#87A2FC
Darker −10%#2354FA
Darker −20%#0538E5
Darker −30%#042CB3
Darker −40%#032081
More saturated +25%#5179FF
Less saturated −25%#6B87E5

Channel breakdown

R85
G123
B251
Red85 (33.3%)
Green123 (48.2%)
Blue251 (98.4%)
Hue226.27°
Saturation (HSL)95.4%
Lightness65.88%
Dominant channelBlue
Hex per channelR 55 · G 7B · B FB

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Every value on this page was computed from “557bfb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.