HEX atlas value

#FFFF66

#FFFF66 is a warm yellow HEX color nearest Laser Lemon. RGB 255, 255, 102, HSL 60° 100% 70%, luminance 0.9374; view contrast and conversions.

yellow warm vibrant

#FFFF66 Sample readable text

HEX #FFFF66

RGB rgb(255, 255, 102)

HSL hsl(60 100% 70%)

CMYK cmyk(0, 0, 60, 0)

Luminance 0.9374

Contrast Black 19.75:1White 1.06:1

CSS

--color-ffff66: #FFFF66;
.background-ffff66 { background-color: #FFFF66; }
.text-ffff66 { color: #FFFF66; }

HEX meaning and use

About #FFFF66

#FFFF66 is classified as a warm yellow value with vibrant visual character. #FFFF66 is visually closest to Laser Lemon, a named yellow color with HEX #FFFF66.

The RGB channels are 255, 255, and 102, with red carrying the strongest channel weight. In HSL, the hue is 60deg with 100% saturation and 70% lightness, so this page treats it as a high-saturation, light atlas color rather than a generic swatch.

Practical uses for this HEX value include color conversion, WCAG contrast checks, CSS color tokens, and high-energy accents. Its luminance is 0.9374, black 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 text19.75:1AA Pass

White text1.06:1AA Fail

AA text options: #000000, #1A1A1A, #36454F.

AAA text options: #000000, #1A1A1A, #36454F.

Accessibility-Safe Pairings and Alternatives

Use these pairings when #FFFF66 needs readable text, badges, interface states, or nearby accessible alternatives.

Black text#00000019.75:1 · AAA

White text#FFFFFF1.06:1 · Fail

Accessible Alternatives

#FFFFC2#FFFFC2 · #000000 text · best 20.34:1 #FFFF0A#FFFF0A · #000000 text · best 19.56:1 #B3FF66#B3FF66 · #000000 text · best 17.41:1 Maize#FBEC5D · #000000 text · best 17.26:1 #EEEE77#EEEE77 · #000000 text · best 17.13:1

Generated Palette

Laser Lemon#FFFF66

#6666FF#6666FF

#FFB366#FFB366

#B3FF66#B3FF66

#FFFFC2#FFFFC2

#FFFF0A#FFFF0A

Color Harmonies

#6666FF#6666FF

#FFB366#FFB366

#B3FF66#B3FF66

#66FFFF#66FFFF

#FF66FF#FF66FF

Variants

#FFFFC2#FFFFC2

#FFFF0A#FFFF0A

Laser Lemon#FFFF66

#EEEE77#EEEE77

#FDFDE7#FDFDE7

#FFFF8F#FFFF8F

Nearest Named Colors

Laser Lemon#FFFF66

Maize#FBEC5D

Naples Yellow#FADA5E

Mustard#FFDB58

Straw#E4D96F

Luminance0.9374

Black text19.75:1AA Pass

White text1.06:1AA Fail

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":"#FFFF66","rgb":[255,255,102],"hsl":[60,100,70],"cmyk":[0,0,60,0],"luminance":0.9374,"contrast":{"black":19.75,"white":1.06}}

WCAG

{"AA":["#000000","#1A1A1A","#36454F"],"AAA":["#000000","#1A1A1A","#36454F"]}

Safe pairings

[{"name":"Black text","hex":"#000000","contrast":19.75,"wcagAA":true,"wcagAAA":true},{"name":"White text","hex":"#FFFFFF","contrast":1.06,"wcagAA":false,"wcagAAA":false}]

Accessible alternatives

[{"name":"#FFFFC2","hex":"#FFFFC2","family":"yellow","bestTextColor":"#000000","contrastBlack":20.34,"contrastWhite":1.03,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#FFFF0A","hex":"#FFFF0A","family":"yellow","bestTextColor":"#000000","contrastBlack":19.56,"contrastWhite":1.07,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#B3FF66","hex":"#B3FF66","family":"green","bestTextColor":"#000000","contrastBlack":17.41,"contrastWhite":1.21,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"Maize","hex":"#FBEC5D","family":"yellow","bestTextColor":"#000000","contrastBlack":17.26,"contrastWhite":1.22,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]},{"name":"#EEEE77","hex":"#EEEE77","family":"yellow","bestTextColor":"#000000","contrastBlack":17.13,"contrastWhite":1.23,"wcagAA":["#000000","#1A1A1A","#36454F"],"wcagAAA":["#000000","#1A1A1A","#36454F"]}]

AI context

{"semanticGroups":["warm yellow","vibrant","vibrant yellow","Laser Lemon adjacent"],"useCases":["color conversion","WCAG contrast checks","CSS color tokens","high-energy accents","highlight and warning systems"],"contrastSafeWith":["#000000","#1A1A1A","#36454F"],"relatedEndpoints":["https://www.colorsencyclopedia.com/api/hex/ffff66.json","https://www.colorsencyclopedia.com/api/hex.json","https://www.colorsencyclopedia.com/api/colors/laser-lemon.json","https://www.colorsencyclopedia.com/api/colors/maize.json","https://www.colorsencyclopedia.com/api/colors/naples-yellow.json"]}

Harmonies

{"complementary":"#6666FF","analogous":["#FFB366","#B3FF66"],"triadic":["#66FFFF","#FF66FF"],"tetradic":["#66FFB3","#6666FF","#FF66B3"],"splitComplementary":["#66B2FF","#B266FF"],"monochromatic":["#FFFFC2","#FFFF66","#FFFF0A"]}

Variants

{"light":"#FFFFC2","dark":"#FFFF0A","saturated":"#FFFF66","desaturated":"#EEEE77","pastel":"#FDFDE7","neon":"#FFFF8F"}

Nearest named colors

[{"slug":"laser-lemon","name":"Laser Lemon","hex":"#FFFF66","distance":0},{"slug":"maize","name":"Maize","hex":"#FBEC5D","distance":21.400934559032695},{"slug":"naples-yellow","name":"Naples Yellow","hex":"#FADA5E","distance":38.18376618407357},{"slug":"mustard","name":"Mustard","hex":"#FFDB58","distance":38.62641583165593},{"slug":"straw","name":"Straw","hex":"#E4D96F","distance":47.47630988187688}]

#FFFF66

CSS

About #FFFF66

WCAG Accessibility

Accessibility-Safe Pairings and Alternatives

Accessible Alternatives

Generated Palette

Color Harmonies

Variants

Nearest Named Colors

Machine-Readable HEX Data (JSON)

Related HEX Guides