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Recognised as Colour

#378BD4

  • #378BD4
  • Blue
  • Dark
  • Nearest: Cornflower blue

#378BD4 is a blue with RGB values 55, 139, 212 and HSL 208°, 65%, 52%. It is a dark colour, so black text on it reaches 5.8:1 contrast (AA for normal text). The nearest named colour is Cornflower blue.

Colour values

#378BD4#378BD4
HEX#378BD4
RGBrgb(55, 139, 212)
RGB (0–1)0.2157, 0.5451, 0.8314
RGB percentages21.6%, 54.5%, 83.1%
HSLhsl(207.9, 64.6%, 52.4%)
HSV / HSBhsv(207.9, 74.1%, 83.1%)
CMYK74.1%, 34.4%, 0%, 16.9%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,640,276
CSS custom property--colour: #378BD4;

Brightness & contrast

Relative luminance0.24031WCAG 2.x, 0 is black and 1 is white
Perceived brightness131.8 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.81:1
Contrast with white3.62:1WCAG normal text: Fail
Contrast with black5.81:1WCAG normal text: AA
Greyscale equivalent#7E7E7E
Inverted#C8742B

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6A8FD7no red cones; affects about 1% of men; ΔE 9.4 from the original
Deuteranopia#5380D3no green cones; the most common form, about 1% of men; ΔE 11.2 from the original
Tritanopia#009CA5no blue cones; rare, and affects men and women equally; ΔE 42.5 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text3.62:1WCAG large text: AA
Contrast with black, large text5.81:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 12.5Steel blue · ΔE 13.4Dodgerblue · ΔE 21.8Deep skyblue · ΔE 23.7Light skyblue · ΔE 30.4Light slate grey · ΔE 33.6
Nearest named CSS colourCornflower blue (#6495ED)ΔE 12.47, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#D48037
Analogous#37D4CF, #373CD4
Triadic#D4378B, #8BD437
Split complementary#D4373C, #D4CF37
Tetradic#CF37D4, #D48037, #3CD437

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#DFECF8
Lighter +30%#B5D4EF
Lighter +20%#8BBCE6
Lighter +10%#61A3DD
Darker −10%#2671B2
Darker −20%#1D5688
Darker −30%#143C5E
Darker −40%#0B2134
More saturated +25%#198DF2
Less saturated −25%#5589B6

Channel breakdown

R55
G139
B212
Red55 (21.6%)
Green139 (54.5%)
Blue212 (83.1%)
Hue207.9°
Saturation (HSL)64.61%
Lightness52.35%
Dominant channelBlue
Hex per channelR 37 · G 8B · B D4

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Every value on this page was computed from “378bd4” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.