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Recognised as Colour

#2563FF

  • #2563FF
  • Blue
  • Dark
  • Nearest: Medium slateblue

#2563FF is a blue with RGB values 37, 99, 255 and HSL 223°, 100%, 57%. It is a dark colour, so white text on it reaches 4.9:1 contrast (AA for normal text). The nearest named colour is Medium slateblue.

Colour values

#2563FF#2563FF
HEX#2563FF
RGBrgb(37, 99, 255)
RGB (0–1)0.1451, 0.3882, 1
RGB percentages14.5%, 38.8%, 100%
HSLhsl(222.9, 100%, 57.3%)
HSV / HSBhsv(222.9, 85.5%, 100%)
CMYK85.5%, 61.2%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer2,450,431
CSS custom property--colour: #2563FF;

Brightness & contrast

Relative luminance0.16537WCAG 2.x, 0 is black and 1 is white
Perceived brightness116.5 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundWhitecontrast 4.88:1
Contrast with white4.88:1WCAG normal text: AA
Contrast with black4.31:1WCAG normal text: Fail
Greyscale equivalent#616161
Inverted#DA9C00

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#007BFFno red cones; affects about 1% of men; ΔE 19.7 from the original
Deuteranopia#0067FCno green cones; the most common form, about 1% of men; ΔE 5.3 from the original
Tritanopia#008CA8no blue cones; rare, and affects men and women equally; ΔE 83.9 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.88:1WCAG large text: AAA
Contrast with black, large text4.31:1WCAG large text: AA

Named colours

Medium slateblue · ΔE 17.8Royal blue · ΔE 21Slate blue · ΔE 24.8Blue violet · ΔE 32.9Medium purple · ΔE 33.1Dark orchid · ΔE 35.1
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 17.77, a distinctly different colour
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFC125
Analogous#25D0FF, #5425FF
Triadic#FF2563, #63FF25
Split complementary#FF5425, #D0FF25
Tetradic#FF25D0, #FFC125, #25FF54

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#F1F5FF
Lighter +30%#BED0FF
Lighter +20%#8BACFF
Lighter +10%#5887FF
Darker −10%#0045F1
Darker −20%#0036BE
Darker −30%#00288B
Darker −40%#001958
More saturated +25%#2563FF
Less saturated −25%#406FE4

Channel breakdown

R37
G99
B255
Red37 (14.5%)
Green99 (38.8%)
Blue255 (100%)
Hue222.94°
Saturation (HSL)100%
Lightness57.25%
Dominant channelBlue
Hex per channelR 25 · G 63 · B FF

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Every value on this page was computed from “2563ff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.