Fluorescent Blue (#15F4EE)

The hex code for Fluorescent Blue is #15F4EE. It is rgb(21, 244, 238) in RGB, hsl(178, 91%, 52%) in HSL, and about cmyk(91%, 0%, 2%, 4%) in CMYK — a mid-tone teal. Black text is the more readable choice on this background.

#15F4EE

HEX#15F4EE

RGBrgb(21, 244, 238)

HSLhsl(178, 91%, 52%)

HSVhsv(178, 91%, 96%)

CMYKcmyk(91%, 0%, 2%, 4%)

OKLCHoklch(87.5% 0.149 191.6)

LABlab(87.10% -49.77 -11.44)

LCHlch(87.10% 51.07 192.95)

Colors Closest to Fluorescent Blue

Fluorescent Blue is a registered color name. These are the named colors nearest to it, measured as CIE76 distance in CIELAB — a perceptual scale, so the ordering matches what the eye sees rather than how close the raw RGB numbers happen to sit.

Neon Cyan#00FEFCΔE 4.24 Bright Turquoise#08E8DEΔE 4.73 Aqua#00FFFFΔE 5.09 Turquoise Blue#00FFEFΔE 6.82 Lotion Blue#15F2FDΔE 9.1 Turquoise#40E0D0ΔE 10.24

Browse the full index of named colors A-Z or every teal in the library.

#15F4EE Channel Values

How Fluorescent Blue breaks down in each color model. Hue is measured in degrees around the color wheel; saturation, lightness, and the CMYK inks are percentages.

Model	Channels	Notes
RGB	R 21 · G 244 · B 238	8-bit channels as sent to the display
HSL	H 178° · S 91% · L 52%	Easiest model for building lighter and darker variants
HSV	H 178° · S 91% · V 96%	Matches the picker in most design tools
CMYK	C 91% · M 0% · Y 2% · K 4%	Approximate ink mix; confirm with an ICC profile before printing
Luminance	1.38:1 vs white · 15.21:1 vs black	WCAG 2.2 relative-luminance contrast ratios

Text Contrast & Accessibility

WCAG 2.2 contrast ratios for text on a Fluorescent Blue background. AA requires 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Contrast is one check, not a full accessibility review.

TextWhite text1.38:1AA normal ✗AA large ✗AAA normal ✗

TextBlack text15.21:1AA normal ✓AA large ✓AAA normal ✓

Need a specific ratio against another background? Open #15F4EE in the contrast checker.

Colors That Go With Fluorescent Blue

Pairings derived from color-wheel relationships. The complementary color sits opposite Fluorescent Blue; analogous colors sit beside it; triadic and split-complementary sets spread evenly around the wheel. Select any swatch for its own breakdown.

Base

Complementary

Analogous

Analogous

Triadic

Triadic

Split comp.

Split comp.

Tints & Shades of Fluorescent Blue

Lighter tints and darker shades built by moving the lightness channel while holding hue and saturation, which is what you want for hover states, backgrounds, and text variants.

Tints

Shades

Want a full 50-950 ramp with semantic roles? Generate design tokens from #15F4EE.

How Fluorescent Blue Looks with Color Vision Deficiency

Simulated with the Viénot, Brettel & Mollon LMS projection model. Anomalous types are rendered as partial versions of the matching dichromacy, which is an approximation rather than a per-person clinical model.

Typical#15F4EE

Protanopia#E1E1EE

Protanomaly#B4E9EE

Deuteranopia#CDCDF1

Deuteranomaly#A3DDF0

Tritanopia#1FF3F3

Tritanomaly#1CF4F1

Achromatopsia#DBDBDB

Test a full palette in the color blindness simulator.

Using #15F4EE in Code

Copy-ready declarations for the places this color usually ends up.

CSS custom property--fluorescent-blue: #15F4EE;

CSS backgroundbackground-color: #15F4EE;

Tailwind configcolors: { 'fluorescent-blue': '#15F4EE' }

SwiftUIColor(red: 0.082, green: 0.957, blue: 0.933)

Android XML<color name="fluorescent_blue">#15F4EE</color>

SVG fillfill="#15F4EE"

More Teal Colors

Fluorescent Blue sits in the tealfamily. These are its neighbours across that family's full range, each with its own breakdown.

176d6d 15f2fd 17827d 157f75 189589 152323 192929 137268 197194 136c68 1aa295 134e4c 232b2b 339999 4c9c9c 6bdaff 8cb9ba adebff ccfeff e5ffff 005a70 008ebd 00ccff 0a2f3d

#15F4EE Frequently Asked Questions

What is the hex code for Fluorescent Blue?

The hex code for Fluorescent Blue is #15F4EE. That is rgb(21, 244, 238) in RGB, hsl(178, 91%, 52%) in HSL, and approximately cmyk(91%, 0%, 2%, 4%) in CMYK.

What is the RGB value of #15F4EE?

#15F4EE is rgb(21, 244, 238) — red 21, green 244, and blue 238 on the 0-255 scale.

What is the CMYK value of #15F4EE?

#15F4EE converts to approximately cmyk(91%, 0%, 2%, 4%). CMYK output is a mathematical approximation for planning; confirm production print colors with your printer and ICC profile.

Should text on #15F4EE be black or white?

Black text is the more readable choice. #15F4EE scores 1.38:1 against white and 15.21:1 against black, and WCAG 2.2 asks for at least 4.5:1 for normal body text.

Can I write #15F4EE as a CSS color keyword?

No. #15F4EE is not one of the CSS color keywords, so it has to be written as a hex, rgb() or hsl() value. The closest keyword is aqua (#00FFFF) at a CIE76 distance of 5.09, which is clearly related but distinguishable side by side.

Open Fluorescent Blue in a Tool

Hex to RGB Hex to HSL Hex to CMYK Hex to OKLCH Hex to Pantone Build a palette Make a gradient

Keep exploring: every teal in the color library, the guide to shades of teal, or the full color library.