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Recognised as Colour

#63BFFF

  • #63BFFF
  • Blue
  • Dark
  • Nearest: Deep skyblue

#63BFFF is a blue with RGB values 99, 191, 255 and HSL 205°, 100%, 69%. It is a dark colour, so black text on it reaches 10.4:1 contrast (AAA for normal text). The nearest named colour is Deep skyblue.

Colour values

#63BFFF#63BFFF
HEX#63BFFF
RGBrgb(99, 191, 255)
RGB (0–1)0.3882, 0.749, 1
RGB percentages38.8%, 74.9%, 100%
HSLhsl(204.6, 100%, 69.4%)
HSV / HSBhsv(204.6, 61.2%, 100%)
CMYK61.2%, 25.1%, 0%, 0%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,537,215
CSS custom property--colour: #63BFFF;

Brightness & contrast

Relative luminance0.47134WCAG 2.x, 0 is black and 1 is white
Perceived brightness178.2 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 10.43:1
Contrast with white2.01:1WCAG normal text: Fail
Contrast with black10.43:1WCAG normal text: AAA
Greyscale equivalent#B0B0B0
Inverted#9C4000

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#A2BFFFno red cones; affects about 1% of men; ΔE 15.3 from the original
Deuteranopia#8DB0FEno green cones; the most common form, about 1% of men; ΔE 17.2 from the original
Tritanopia#00CFD5no blue cones; rare, and affects men and women equally; ΔE 39.2 from the original
Distinguishable without hueYesnever rely on hue alone to carry meaning
Contrast with white, large text2.01:1WCAG large text: Fail
Contrast with black, large text10.43:1WCAG large text: AAA

Named colours

Deep skyblue · ΔE 9.4Light skyblue · ΔE 12.6Sky blue · ΔE 20Steel blue · ΔE 23.6Cornflower blue · ΔE 23.9Light steelblue · ΔE 26
Nearest named CSS colourDeep skyblue (#00BFFF)ΔE 9.44, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FFA363
Analogous#63FFF1, #6371FF
Triadic#FF63BF, #BFFF63
Split complementary#FF6371, #FFF163
Tetradic#F163FF, #FFA363, #71FF63

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#FCFEFF
Lighter +20%#C9E9FF
Lighter +10%#96D4FF
Darker −10%#30AAFF
Darker −20%#0095FC
Darker −30%#0077C9
Darker −40%#005896
More saturated +25%#63BFFF
Less saturated −25%#76BBEC

Channel breakdown

R99
G191
B255
Red99 (38.8%)
Green191 (74.9%)
Blue255 (100%)
Hue204.62°
Saturation (HSL)100%
Lightness69.41%
Dominant channelBlue
Hex per channelR 63 · G BF · B FF

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Every value on this page was computed from “63bfff” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.