HEX atlas value

#1C39BB

#1C39BB is a cool blue HEX color close to Persian Blue. According to Colors Encyclopedia, it converts to RGB 28, 57, 187, HSL 229, 74%, 42%, has luminance 0.0676, and belongs to the vibrant and jewel tone groups.

blue cool vibrant jewel-tone

#1C39BB Sample readable text

HEX #1C39BB

RGB rgb(28, 57, 187)

HSL hsl(229 74% 42%)

CMYK cmyk(85, 70, 0, 27)

Luminance 0.0676

Contrast Black 2.35:1White 8.93:1

CSS

--color-1c39bb: #1C39BB;
.background-1c39bb { background-color: #1C39BB; }
.text-1c39bb { color: #1C39BB; }

Luminance0.0676

Black text2.35:1AA Fail

White text8.93:1AA 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":"#1C39BB","rgb":[28,57,187],"hsl":[229,74,42],"cmyk":[85,70,0,27],"luminance":0.0676,"contrast":{"black":2.35,"white":8.93}}

WCAG

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

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":2.35,"wcagAA":false,"wcagAAA":false},{"name":"White text","hex":"#FFFFFF","contrast":8.93,"wcagAA":true,"wcagAAA":true}]

Accessible alternatives

[{"name":"#10216A","hex":"#10216A","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":1.45,"contrastWhite":14.5,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Egyptian Blue","hex":"#1034A6","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.06,"contrastWhite":10.17,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#4E1CBA","hex":"#4E1CBA","family":"purple","bestTextColor":"#FFFFFF","contrastBlack":2.2,"contrastWhite":9.55,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"#042AD2","hex":"#042AD2","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.27,"contrastWhite":9.27,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]},{"name":"Cobalt Blue","hex":"#0047AB","family":"blue","bestTextColor":"#FFFFFF","contrastBlack":2.49,"contrastWhite":8.43,"wcagAA":["#FFFFFF","#F5F5F5"],"wcagAAA":["#FFFFFF","#F5F5F5"]}]

AI context

{"semanticGroups":["cool blue","vibrant","jewel tone","vibrant blue","jewel tone blue","Persian Blue adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","rich accent palettes","high-energy accents","calm digital interfaces"],"contrastSafeWith":["#FFFFFF","#F5F5F5"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/1c39bb.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/persian-blue.json","https://www.colorsencyclopedia.com/api/colors/egyptian-blue.json","https://www.colorsencyclopedia.com/api/colors/sapphire.json"]}

Harmonies

{"complementary":"#BA9D1C","analogous":["#1C88BA","#4E1CBA"],"triadic":["#BA1C39","#39BA1C"],"tetradic":["#BA1C88","#BA9D1C","#1CBA4E"],"splitComplementary":["#BA4E1C","#88BA1C"],"monochromatic":["#4E69E4","#1C39BB","#10216A"]}

Variants

{"light":"#4E69E4","dark":"#10216A","saturated":"#042AD2","desaturated":"#3348A3","pastel":"#798BDC","neon":"#002FFF"}

Nearest named colors

[{"slug":"persian-blue","name":"Persian Blue","hex":"#1C39BB","distance":0},{"slug":"egyptian-blue","name":"Egyptian Blue","hex":"#1034A6","distance":24.698178070456937},{"slug":"sapphire","name":"Sapphire","hex":"#0F52BA","distance":28.19574435974337},{"slug":"violet-blue","name":"Violet Blue","hex":"#324AB2","distance":29.223278392404914},{"slug":"cobalt-blue","name":"Cobalt Blue","hex":"#0047AB","distance":35.156791662493895}]

HEX meaning and use

About #1C39BB

#1C39BB is classified as a cool blue value with vibrant and jewel tone visual character. #1C39BB is visually closest to Persian Blue, a named blue color with HEX #1C39BB.

The RGB channels are 28, 57, and 187, with blue carrying the strongest channel weight. In HSL, the hue is 229deg with 74% saturation and 42% 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 rich accent palettes. Its luminance is 0.0676, 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 text2.35:1AA Fail

White text8.93:1AA Pass

AA text options: #FFFFFF, #F5F5F5.

AAA text options: #FFFFFF, #F5F5F5.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #1C39BB needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#0000002.35:1 · Fail

White text#FFFFFF8.93:1 · AAA

Accessible Alternatives

#10216A#FFFFFF text · best 14.5:1#10216A

Egyptian Blue#FFFFFF text · best 10.17:1#1034A6

#4E1CBA#FFFFFF text · best 9.55:1#4E1CBA

#042AD2#FFFFFF text · best 9.27:1#042AD2

Cobalt Blue#FFFFFF text · best 8.43:1#0047AB

Generated Palette

Persian Blue#1C39BB

#BA9D1C#BA9D1C

#1C88BA#1C88BA

#4E1CBA#4E1CBA

#4E69E4#4E69E4

#10216A#10216A

Color Harmonies

#BA9D1C#BA9D1C

#1C88BA#1C88BA

#4E1CBA#4E1CBA

#BA1C39#BA1C39

#39BA1C#39BA1C

Variants

#4E69E4#4E69E4

#10216A#10216A

#042AD2#042AD2

#3348A3#3348A3

#798BDC#798BDC

#002FFF#002FFF

Nearest Named Colors

Persian Blue#1C39BB

Egyptian Blue#1034A6

Sapphire#0F52BA

Violet Blue#324AB2

Cobalt Blue#0047AB

#1C39BB

CSS

Machine-Readable HEX Data (JSON)

About #1C39BB

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Related HEX Guides