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Colour

#309BFF

  • #309BFF
  • Blue
  • Dark
  • Nearest: Dodgerblue

#309BFF is a blue with RGB values 48, 155, 255 and HSL 209°, 100%, 59%. It is a dark colour, so black text on it reaches 7.3:1 contrast (AAA for normal text). The nearest named colour is Dodgerblue.

Colour values

#309BFF#309BFF
HEX#309BFF
RGBrgb(48, 155, 255)
RGB (0–1)0.1882, 0.6078, 1
RGB percentages18.8%, 60.8%, 100%
HSLhsl(209, 100%, 59.4%)
HSV / HSBhsv(209, 81.2%, 100%)
CMYK81.2%, 39.2%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer3,185,663
CSS custom property--colour: #309BFF;

Brightness & contrast

Relative luminance0.31291WCAG 2.x, 0 is black and 1 is white
Perceived brightness149 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 7.26:1
Contrast with white2.89:1WCAG normal text: Fail
Contrast with black7.26:1WCAG normal text: AAA
Greyscale equivalent#8B8B8B
Inverted#CF6400

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#6AA2FFno red cones; affects about 1% of men; ΔE 8.4 from the original
Deuteranopia#488FFDno green cones; the most common form, about 1% of men; ΔE 10 from the original
Tritanopia#00B3C1no blue cones; rare, and affects men and women equally; ΔE 54.8 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text2.89:1WCAG large text: Fail
Contrast with black, large text7.26:1WCAG large text: AAA

Named colours

Dodgerblue · ΔE 8.3Cornflower blue · ΔE 9.9Royal blue · ΔE 27.2Deep skyblue · ΔE 28.9Steel blue · ΔE 29.1Medium purple · ΔE 34
Nearest named CSS colourDodgerblue (#1E90FF)ΔE 8.28, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FF9430
Analogous#30FFFB, #3034FF
Triadic#FF309B, #9BFF30
Split complementary#FF3034, #FFFC30
Tetradic#FB30FF, #FF9430, #34FF30

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FCFEFF
Lighter +30%#C9E5FF
Lighter +20%#96CCFF
Lighter +10%#63B4FF
Darker −10%#0082FC
Darker −20%#0068C9
Darker −30%#004E96
Darker −40%#003363
More saturated +25%#309BFF
Less saturated −25%#4A9AE5

Channel breakdown

R48
G155
B255
Red48 (18.8%)
Green155 (60.8%)
Blue255 (100%)
Hue208.99°
Saturation (HSL)100%
Lightness59.41%
Dominant channelBlue
Hex per channelR 30 · G 9B · B FF

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Every value on this page was computed from “309bff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.