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Recognised as Colour

#37A4FF

  • #37A4FF
  • Blue
  • Dark
  • Nearest: Cornflower blue

#37A4FF is a blue with RGB values 55, 164, 255 and HSL 207°, 100%, 61%. It is a dark colour, so black text on it reaches 7.9:1 contrast (AAA for normal text). The nearest named colour is Cornflower blue.

Colour values

#37A4FF#37A4FF
HEX#37A4FF
RGBrgb(55, 164, 255)
RGB (0–1)0.2157, 0.6431, 1
RGB percentages21.6%, 64.3%, 100%
HSLhsl(207.3, 100%, 60.8%)
HSV / HSBhsv(207.3, 78.4%, 100%)
CMYK78.4%, 35.7%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,646,719
CSS custom property--colour: #37A4FF;

Brightness & contrast

Relative luminance0.34583WCAG 2.x, 0 is black and 1 is white
Perceived brightness155.3 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.92:1
Contrast with white2.65:1WCAG normal text: Fail
Contrast with black7.92:1WCAG normal text: AAA
Greyscale equivalent#939393
Inverted#C85B00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#79A9FFno red cones; affects about 1% of men; ΔE 10.5 from the original
Deuteranopia#5B97FDno green cones; the most common form, about 1% of men; ΔE 12.3 from the original
Tritanopia#00BAC5no blue cones; rare, and affects men and women equally; ΔE 50.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.65:1WCAG large text: Fail
Contrast with black, large text7.92:1WCAG large text: AAA

Named colours

Cornflower blue · ΔE 10.8Dodgerblue · ΔE 15.1Deep skyblue · ΔE 22.2Steel blue · ΔE 25.5Light skyblue · ΔE 31Royal blue · ΔE 33.6
Nearest named CSS colourCornflower blue (#6495ED)ΔE 10.82, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF9237
Analogous#37FFF6, #3740FF
Triadic#FF37A4, #A4FF37
Split complementary#FF3740, #FFF637
Tetradic#F637FF, #FF9237, #40FF37

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#D0EAFF
Lighter +20%#9DD2FF
Lighter +10%#6ABBFF
Darker −10%#048DFF
Darker −20%#0071D0
Darker −30%#00569D
Darker −40%#003A6A
More saturated +25%#37A4FF
Less saturated −25%#50A2E6

Channel breakdown

R55
G164
B255
Red55 (21.6%)
Green164 (64.3%)
Blue255 (100%)
Hue207.3°
Saturation (HSL)100%
Lightness60.78%
Dominant channelBlue
Hex per channelR 37 · G A4 · B FF

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Every value on this page was computed from “37a4ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.