Blue color · XKCD survey name
Neon Blue Color Code: #04D9FF
The HEX code for Neon Blue is #04D9FF. It is a medium, vivid cyan color made of 4 red, 217 green and 255 blue (HSL 189°, 100%, 51%). Black text reads best on it (12.37:1 contrast).
Neon Blue color values
#04D9FF
rgb(4, 217, 255)
hsl(189, 100%, 51%)
189, 98%, 100%
hwb(189 2% 0%)
98%, 15%, 0%, 0%
317951
CMYK is a standard screen-to-print conversion. Printed results depend on inks, paper and color profiles.
What is Neon Blue?
“Neon Blue” is a crowd-sourced name from the XKCD Color Survey, in which participants typed names for colors they were shown. It is a popular everyday label rather than an official standard.
Its hue angle of 189° places it in the cyan part of the color wheel, with 100% saturation (vivid) and 51% lightness (medium). It is a cool color.
Compared with the other blue colors in the Aqeeb Studio library, it is lighter than 62% of them and more saturated than 87% of them.
Its relative luminance is 0.569, which makes it a light color. That is above the 0.179 crossover point at which black and white text have equal contrast, so black text has the advantage.
Neon Blue counts as a light color: its HSL lightness is 51% and its relative luminance is 0.569. Black text reads best on it (12.37:1 contrast).
Text contrast on Neon Blue
| Text | Preview | Ratio | AA normal | AA large | AAA normal | AAA large |
|---|---|---|---|---|---|---|
| White text | Sample text | 1.69:1 Poor | Fail | Fail | Fail | Fail |
| Black text | Sample text | 12.37:1 Excellent | Pass | Pass | Pass | Pass |
Ratios use the WCAG 2 formula and are truncated, never rounded up. Test any pair with the contrast checker.
Colors that go with Neon Blue
Complementary color
Complementary colors sit directly opposite each other on the color wheel (180° apart). They give the strongest hue contrast, which suits calls to action and accents.
Analogous colors
Analogous colors are neighbors on the wheel, 30° either side of the base hue. They blend smoothly and are easy to combine in backgrounds, gradients and illustrations.
Triadic colors
A triadic scheme uses three hues spaced 120° apart. It is lively yet balanced, and works best when one color leads and the other two act as accents.
Split-complementary colors
Split-complementary keeps the base color and uses the two colors on either side of its complement (150° and 210°). The contrast is strong but gentler than a direct complement.
Tetradic colors
A tetradic (rectangle) scheme combines two complementary pairs at 0°, 60°, 180° and 240°. It offers variety but needs one dominant color to stay balanced.
Monochromatic variants
Monochromatic variants keep the same hue and saturation and only change lightness, which makes them dependable for UI scales and subtle layered designs.
A “≈” before a name means the exact harmony color has no named match, so the link goes to the closest named color.
Tints and shades of Neon Blue
Lighter tints (mixed with white)
Darker shades (mixed with black)
Select any swatch to copy its HEX code. Build longer scales with the tints and shades tool.
Similar colors
Where to use Neon Blue
- Card, highlight and section backgrounds with dark text (12.37:1 contrast with black)
- Accents that need to stand out: call-to-action buttons, charts and illustrations
- Links, buttons and primary interface accents
- Corporate, finance and software branding
- Headers and navigation bars
- Charts and dashboards
Use Neon Blue in CSS
:root {
--color-neon-blue: #04D9FF;
}
.element {
color: var(--color-neon-blue);
background-color: #04D9FF;
border: 2px solid #04D9FF;
}Questions about Neon Blue
What is the HEX code for Neon Blue?
Neon Blue is #04D9FF.
What is the RGB value of Neon Blue?
The RGB value of Neon Blue is 4, 217, 255: 4 red, 217 green and 255 blue on a 0–255 scale, written rgb(4, 217, 255) in CSS.
What is the HSL value of Neon Blue?
The HSL value of Neon Blue is 189°, 100%, 51% (hue, saturation, lightness), written hsl(189, 100%, 51%) in CSS.
What is the CMYK value of Neon Blue?
A standard conversion gives about C 98%, M 15%, Y 0%, K 0%. Real print results depend on the inks, paper and color profile, so treat CMYK here as a reference value.
Is Neon Blue a light or dark color?
Neon Blue counts as a light color: its HSL lightness is 51% and its relative luminance is 0.569. Black text reads best on it (12.37:1 contrast).
How does Neon Blue look with white text?
White text on Neon Blue has a contrast ratio of 1.69:1, rated Poor. It falls below the WCAG minimum for text.
How does Neon Blue look with black text?
Black text on Neon Blue has a contrast ratio of 12.37:1, rated Excellent. It meets WCAG AA for normal text.
What colors go well with Neon Blue?
Red Orange is its complementary color, and Bright Sea Green sits beside it as an analogous color. Lighter and darker variants of the same hue also work well for monochromatic palettes.
Where can Neon Blue be used?
It suits card, highlight and section backgrounds with dark text (12.37:1 contrast with black); accents that need to stand out: call-to-action buttons, charts and illustrations; links, buttons and primary interface accents.
How do I use Neon Blue in CSS?
Use color: #04D9FF; for text, background-color: #04D9FF; for fills, or define a custom property such as --color-neon-blue: #04D9FF; and reuse it with var(--color-neon-blue).
About this color page
Crowd-sourced name from the XKCD Color Survey (CC0). Values are calculated from the HEX code; color names are labels, not trademarks or standards unless stated. Screens render colors differently, so always check important colors on your own device. See the disclaimer.