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Recognised as Colour

#666DFE

  • #666DFE
  • Blue
  • Dark
  • Nearest: Medium slateblue

#666DFE is a blue with RGB values 102, 109, 254 and HSL 237°, 99%, 70%. It is a dark colour, so black text on it reaches 5.2:1 contrast (AA for normal text). The nearest named colour is Medium slateblue.

Colour values

#666DFE#666DFE
HEX#666DFE
RGBrgb(102, 109, 254)
RGB (0–1)0.4, 0.4275, 0.9961
RGB percentages40%, 42.7%, 99.6%
HSLhsl(237.2, 98.7%, 69.8%)
HSV / HSBhsv(237.2, 59.8%, 99.6%)
CMYK59.8%, 57.1%, 0%, 0.4%≈naive device-independent conversion; real print needs an ICC profile
24-bit integer6,712,830
CSS custom property--colour: #666DFE;

Brightness & contrast

Relative luminance0.20918WCAG 2.x, 0 is black and 1 is white
Perceived brightness132.1 of 255ITU-R BT.601 weighting
Light or darkDark
Best text colour on this backgroundBlackcontrast 5.18:1
Contrast with white4.05:1WCAG normal text: Fail
Contrast with black5.18:1WCAG normal text: AA
Greyscale equivalent#767676
Inverted#999201

Colour vision & accessibility

Normal visionProtanopiaDeuteranopiaTritanopia
Protanopia#0085FFno red cones; affects about 1% of men; ΔE 24.1 from the original
Deuteranopia#0078FBno green cones; the most common form, about 1% of men; ΔE 16.9 from the original
Tritanopia#0090ABno blue cones; rare, and affects men and women equally; ΔE 79.3 from the original
Distinguishable without hueShifts in lightness toonever rely on hue alone to carry meaning
Contrast with white, large text4.05:1WCAG large text: AA
Contrast with black, large text5.18:1WCAG large text: AAA

Named colours

Medium slateblue · ΔE 8.1Royal blue · ΔE 16Slate blue · ΔE 17.5Medium purple · ΔE 23.4Dark orchid · ΔE 30.6Dodgerblue · ΔE 31.5
Nearest named CSS colourMedium slateblue (#7B68EE)ΔE 8.1, clearly different but related
Hue familyblue
CSS keyword usableNo exact keyword

Colour harmonies

base+30°+90°+120°+180°+210°+240°+270°+330°
Complementary#FEF766
Analogous#66B9FE, #AB66FE
Triadic#FE666D, #6DFE66
Split complementary#FEAB66, #B9FE66
Tetradic#FE66B9, #FEF766, #66FEAB

Tints, shades & saturation

+40%+30%+20%+10%base-10%-20%-30%-40%
Lighter +40%#FFFFFF
Lighter +30%#FEFEFF
Lighter +20%#CBCEFF
Lighter +10%#999DFE
Darker −10%#333DFE
Darker −20%#020DFC
Darker −30%#010BCA
Darker −40%#010897
More saturated +25%#656CFF
Less saturated −25%#797EEB

Channel breakdown

R102
G109
B254
Red102 (40%)
Green109 (42.7%)
Blue254 (99.6%)
Hue237.24°
Saturation (HSL)98.7%
Lightness69.8%
Dominant channelBlue
Hex per channelR 66 · G 6D · B FE

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Every value on this page was computed from “666dfe” by Nerdulator’s colour engine. Nothing here was retrieved from a database of answers or written by a model.