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Colour

#337DFB

  • #337DFB
  • Blue
  • Dark
  • Nearest: Royal blue

#337DFB is a blue with RGB values 51, 125, 251 and HSL 218°, 96%, 59%. It is a dark colour, so black text on it reaches 5.5:1 contrast (AA for normal text). The nearest named colour is Royal blue.

Colour values

#337DFB#337DFB
HEX#337DFB
RGBrgb(51, 125, 251)
RGB (0–1)0.2, 0.4902, 0.9843
RGB percentages20%, 49%, 98.4%
HSLhsl(217.8, 96.2%, 59.2%)
HSV / HSBhsv(217.8, 79.7%, 98.4%)
CMYK79.7%, 50.2%, 0%, 1.6%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,374,587
CSS custom property--colour: #337DFB;

Brightness & contrast

Relative luminance0.22336WCAG 2.x, 0 is black and 1 is white
Perceived brightness130.9 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.47:1
Contrast with white3.84:1WCAG normal text: Fail
Contrast with black5.47:1WCAG normal text: AA
Greyscale equivalent#767676
Inverted#CC8204

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#2A8CFFno red cones; affects about 1% of men; ΔE 10.4 from the original
Deuteranopia#007AF9no green cones; the most common form, about 1% of men; ΔE 2.8 from the original
Tritanopia#009CB0no blue cones; rare, and affects men and women equally; ΔE 69.1 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.84:1WCAG large text: AA
Contrast with black, large text5.47:1WCAG large text: AAA

Named colours

Royal blue · ΔE 8.9Dodgerblue · ΔE 14Medium slateblue · ΔE 19.9Slate blue · ΔE 20.5Medium purple · ΔE 24.4Cornflower blue · ΔE 24.6
Nearest named CSS colourRoyal blue (#4169E1)ΔE 8.93, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FBB133
Analogous#33E1FB, #4D33FB
Triadic#FB337D, #7DFB33
Split complementary#FB4D33, #E1FB33
Tetradic#FB33E1, #FBB133, #33FB4D

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FBFDFF
Lighter +30%#C9DDFE
Lighter +20%#97BDFD
Lighter +10%#659DFC
Darker −10%#055EF6
Darker −20%#044BC4
Darker −30%#033892
Darker −40%#022560
More saturated +25%#2F7CFF
Less saturated −25%#4D84E1

Channel breakdown

R51
G125
B251
Red51 (20%)
Green125 (49%)
Blue251 (98.4%)
Hue217.8°
Saturation (HSL)96.15%
Lightness59.22%
Dominant channelBlue
Hex per channelR 33 · G 7D · B FB

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Every value on this page was computed from “337dfb” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.