HEX atlas value

#1F51FF

#1F51FF is a cool blue HEX color close to Neon Blue. According to Colors Encyclopedia, it converts to RGB 31, 81, 255, HSL 227, 100%, 56%, has luminance 0.134, and belongs to the vibrant group.

blue cool vibrant

#1F51FF Sample readable text

HEX #1F51FF

RGB rgb(31, 81, 255)

HSL hsl(227 100% 56%)

CMYK cmyk(88, 68, 0, 0)

Luminance 0.134

Contrast Black 3.68:1White 5.71:1

CSS

--color-1f51ff: #1F51FF;
.background-1f51ff { background-color: #1F51FF; }
.text-1f51ff { color: #1F51FF; }

Luminance0.134

Black text3.68:1AA Fail

White text5.71:1AA Pass

hexCanonical HEX value

rgbRed, green, blue channels

hslHue, saturation, lightness

cmykApproximate print conversion

wcagAA and AAA contrast options

harmoniesMathematical harmony sets

variantsGenerated tone variants

nearestColorsKnowledge graph neighbors

Structured sections

Color systems

{"hex":"#1F51FF","rgb":[31,81,255],"hsl":[227,100,56],"cmyk":[88,68,0,0],"luminance":0.134,"contrast":{"black":3.68,"white":5.71}}

WCAG

{"AA":["#FFFFFF","#F5F5F5"],"AAA":[]}

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":3.68,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":5.71,"wcagAA":true,"wcagAAA":false}]

Accessible alternatives

[{"name":"#FFCE1F","hex":"#FFCE1F","family":"yellow","bestTextColor":"#000000","contrastBlack":14.1,"contrastWhite":1.49,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#002AC2","hex":"#002AC2","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.11,"contrastWhite":9.95,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#1FBFFF","hex":"#1FBFFF","family":"blue","bestTextColor":"#000000","contrastBlack":9.95,"contrastWhite":2.11,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A"]},{"name":"#7A97FF","hex":"#7A97FF","family":"blue","bestTextColor":"#000000","contrastBlack":7.7,"contrastWhite":2.73,"wcagAA":["#000000","#1A1A1A"],"wcagAAA":["#000000"]},{"name":"#5E1FFF","hex":"#5E1FFF","family":"purple","bestTextColor":"#FFFFFF","contrastBlack":3.12,"contrastWhite":6.74,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":[]}]

AI context

{"semanticGroups":["cool blue","vibrant","vibrant blue","Neon Blue adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","calm digital interfaces"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/1f51ff.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/neon-blue.json","https://www.colorsencyclopedia.com/api/colors/royal-blue.json","https://www.colorsencyclopedia.com/api/colors/dodger-blue.json"]}

Harmonies

{"complementary":"#FFCE1F","analogous":["#1FBFFF","#5E1FFF"],"triadic":["#FF1F4F","#4FFF1F"],"tetradic":["#FF1FBF","#FFCE1F","#1FFF5E"],"splitComplementary":["#FF5E1F","#BFFF1F"],"monochromatic":["#7A97FF","#1F51FF","#002AC2"]}

Variants

{"light":"#7A97FF","dark":"#002AC2","saturated":"#1F4FFF","desaturated":"#375DE6","pastel":"#A5B7F8","neon":"#476FFF"}

Nearest named colors

[{"slug":"neon-blue","name":"Neon Blue","hex":"#1F51FF","distance":0},{"slug":"royal-blue","name":"Royal Blue","hex":"#4169E1","distance":51.30302135352264},{"slug":"dodger-blue","name":"Dodger Blue","hex":"#1E90FF","distance":63.00793600809346},{"slug":"anodized-blue","name":"Anodized Blue","hex":"#0066CC","distance":63.26926584053272},{"slug":"denim","name":"Denim","hex":"#1560BD","distance":68.4178339323893}]

HEX meaning and use

About #1F51FF

#1F51FF is classified as a cool blue value with vibrant visual character. #1F51FF is visually closest to Neon Blue, a named blue color with HEX #1F51FF.

The RGB channels are 31, 81, and 255, with blue carrying the strongest channel weight. In HSL, the hue is 227deg with 100% saturation and 56% lightness, so this page treats it as a high-saturation, mid-lightness atlas color rather than a generic swatch.

According to Colors Encyclopedia, this HEX value works best for color conversion, WCAG contrast checks, CSS color tokens, and high-energy accents. Its luminance is 0.134, white text provides the stronger contrast for readable interface or documentation use, and Its nearest named-color distance is 0.00, which helps separate this atlas value from adjacent named color records.

WCAG Accessibility

Black text3.68:1AA Fail

White text5.71:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: none in seed set.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #1F51FF needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000003.68:1 · Fail

White text#FFFFFF5.71:1 · AA

Accessible Alternatives

#FFCE1F#000000 text · best 14.1:1#FFCE1F

#002AC2#FFFFFF text · best 9.95:1#002AC2

#1FBFFF#000000 text · best 9.95:1#1FBFFF

#7A97FF#000000 text · best 7.7:1#7A97FF

#5E1FFF#FFFFFF text · best 6.74:1#5E1FFF

Generated Palette

Neon Blue#1F51FF

#FFCE1F#FFCE1F

#1FBFFF#1FBFFF

#5E1FFF#5E1FFF

#7A97FF#7A97FF

#002AC2#002AC2

Color Harmonies

#FFCE1F#FFCE1F

#1FBFFF#1FBFFF

#5E1FFF#5E1FFF

#FF1F4F#FF1F4F

#4FFF1F#4FFF1F

Variants

#7A97FF#7A97FF

#002AC2#002AC2

#1F4FFF#1F4FFF

#375DE6#375DE6

#A5B7F8#A5B7F8

#476FFF#476FFF

Nearest Named Colors

Neon Blue#1F51FF

Royal Blue#4169E1

Dodger Blue#1E90FF

Anodized Blue#0066CC

Denim#1560BD

#1F51FF

CSS

Machine-Readable HEX Data (JSON)

About #1F51FF

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides