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cyan · cool

#28f2fe

a balanced, electric cyan · cool · closest name: Cyan

Token name suggestion: Signal Reef

RGB
40, 242, 254
HSL
183°, 99%, 58%
CMYK
84, 5, 0, 0
Luminance
0.7111

#28f2fe is a balanced electric cyan, 183° on the wheel and 89/100 on the cool side. Put black text on it (15.22:1). As text it scores 1.38:1 on white — use #017F87 instead. Nearest name is Cyan, nearest Tailwind family is cyan.

hsl(183 99% 58%)rgb(40 242 254)Base step 500AAA inkCool

At a glance

Every number on this page in one read: what #28f2fe is made of, how bright it looks, and which way it leans.

Hex
#28f2fe
Hue
183°
cyan
Saturation
99%
electric
Lightness
58%
balanced
Brightness
100%
HSV value
Perceived
81%
weighted brightness
Luminance
0.7111
WCAG relative
Temperature
Cool
89/100 cool
Color family
Cyan
Tone
Electric
Best ink
Black
15.22:1
Closest name
Cyan
ΔE2000 4.8
Chroma
45.4
LCH, 0–130ish
OKLCH L
0.877
perceptual lightness
Tailwind
cyan
500 · ΔE 15.8
Web-safe
#33FFFF
nearest of 216
Where it sits
Hue183° of 360°
Saturation99%
Lightness58%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #28f2fe.

Temperature
Warm ← → Cool89% cool

Reads cool. Warm and cool siblings keep the same lightness, so you can swap one in without redoing your contrast maths.

Luminance by channel
Red1%
Green89%
Blue10%

Green carries most of what the eye calls brightness — that is why WCAG weights it 0.7152.

Every format

HEX#28f2fe
HEX (8-digit)#28f2feff
RGBrgb(40, 242, 254)
RGBArgba(40, 242, 254, 1)
HSLhsl(183, 99%, 58%)
HSV / HSBhsv(183, 84%, 100%)
HWBhwb(183 16% 0%)
CMYKcmyk(84%, 5%, 0%, 0%)
LABlab(87.5 -41.3 -19.0)
LCHlch(87.5 45.4 204.7)
OKLCHoklch(0.877 0.144 201.5)
XYZ (D65)xyz(50.51, 71.10, 104.81)
Decimal2683646
Display P3color(display-p3 0.157 0.949 0.996)
Web-safe#33FFFF

Copy-ready code

every platformclick to select
/* CSS */
color: #28f2fe;
background-color: #28f2fe;
/* CSS custom property */
--brand: #28f2fe;
/* Tailwind (arbitrary) */
class="text-[#28f2fe] bg-[#28f2fe]"
/* SCSS */
$brand: #28f2fe;
/* SwiftUI */
Color(red: 0.157, green: 0.949, blue: 0.996)
/* UIKit */
UIColor(red: 0.157, green: 0.949, blue: 0.996, alpha: 1)
/* Android XML */
<color name="brand">#28F2FE</color>
/* Android Compose */
Color(0xFF28F2FE)
/* Flutter */
Color(0xFF28F2FE)
/* Python / OpenCV (BGR) */
(254, 242, 40)
/* Python / PIL (RGB) */
(40, 242, 254)
/* Java AWT */
new Color(40, 242, 254)
/* .NET */
Color.FromArgb(255, 40, 242, 254)
/* OpenGL / Unity (0–1) */
(0.1569f, 0.9490f, 0.9961f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{40,242,254}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #28f2fe 85%, white);
border-color: color-mix(in oklab, #28f2fe 40%, transparent);
/* theme-aware in one line */
color: light-dark(#01787F, #D3EDEE);
/* relative colour syntax */
--hover: hsl(from #28f2fe h s calc(l - 7));

Design tokens

The same ramp in the four formats a team actually needs. Paste one and the whole palette lands with it.

css custom propertiesclick to select
:root {
  --brand-50: #F1FDFE;
  --brand-100: #E3FBFC;
  --brand-200: #C0F8FB;
  --brand-300: #8FF8FE;
  --brand-400: #57F5FE;
  --brand-500: #28f2fe;
  --brand-600: #01E6F4;
  --brand-700: #01C0CB;
  --brand-800: #0199A2;
  --brand-900: #056F75;
  --brand-950: #034549;
  --brand: #28f2fe;
  --brand-ink: #000000;
  --brand-surface: #F4FAFA;
  --brand-border: #C0EAED;
  --brand-hover: #04F0FE;
  --brand-pressed: #01D1DD;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142424;
    --brand-ink: #D3EDEE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F1FDFE',
        100: '#E3FBFC',
        200: '#C0F8FB',
        300: '#8FF8FE',
        400: '#57F5FE',
        500: '#28f2fe',
        600: '#01E6F4',
        700: '#01C0CB',
        800: '#0199A2',
        900: '#056F75',
        950: '#034549',
        DEFAULT: '#28f2fe',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F1FDFE,
  '100': #E3FBFC,
  '200': #C0F8FB,
  '300': #8FF8FE,
  '400': #57F5FE,
  '500': #28f2fe,
  '600': #01E6F4,
  '700': #01C0CB,
  '800': #0199A2,
  '900': #056F75,
  '950': #034549,
);
$brand-base: #28f2fe;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F1FDFE", "$type": "color" },
      "100": { "$value": "#E3FBFC", "$type": "color" },
      "200": { "$value": "#C0F8FB", "$type": "color" },
      "300": { "$value": "#8FF8FE", "$type": "color" },
      "400": { "$value": "#57F5FE", "$type": "color" },
      "500": { "$value": "#28f2fe", "$type": "color" },
      "600": { "$value": "#01E6F4", "$type": "color" },
      "700": { "$value": "#01C0CB", "$type": "color" },
      "800": { "$value": "#0199A2", "$type": "color" },
      "900": { "$value": "#056F75", "$type": "color" },
      "950": { "$value": "#034549", "$type": "color" }
    },
    "brandInk": { "$value": "#000000", "$type": "color" }
  }
}

Best text color

Only one of black and white can be right. This is the one, with the number that proves it.

Readable at a glance#000000 on #28f2fe · 15.22:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 1.38:1
AA fail · AA large fail · AAA fail
Aa
Black text · 15.22:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #28f2fe as text scores 1.38:1 on white and 15.22:1 on black.
Best tinted ink on it, if plain black or white feels flat: #01787F at 3.81:1.

Make it accessible

A contrast checker tells you that you failed. This tells you what to ship instead — same hue, same saturation, lightness moved only as far as WCAG demands.

The quick fox
#017F87 · 4.79:1
AA on white−31% L
#017F87
The quick fox
#006369 · 7.03:1
AAA on white−37% L
#006369
The quick fox
#28f2fe · 15.22:1
AA on blackalready passes
#28f2fe
The quick fox
#28f2fe · 15.22:1
AAA on blackalready passes
#28f2fe

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #01A1AB is enough for headings on white. Non-text elements such as icons, chart strokes and focus rings also sit at 3:1 under WCAG 2.2 (1.4.11).

Accessibility — WCAG contrast

Aa
#28f2fe on white: 1.38:1
AA ✗ fail · AA-large · AAA
Aa
#28f2fe on black: 15.22:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #28f2fe as text on that neutral, and that neutral as text on #28f2fe.

NeutralRatioBoth directions
White1.38:1AaAa
Slate 501.32:1AaAa
Slate 1001.26:1AaAa
Slate 2001.12:1AaAa
Slate 3001.08:1AaAa
Slate 4001.86:1AaAa
Slate 5003.45:1AaAa
Slate 6005.49:1AaAa
Slate 7007.51:1AaAa
Slate 80010.60:1AaAa
Slate 90012.94:1AaAa
Black15.22:1AaAa
Colour vision deficiency
true color
protanopia · #DFE7FF
deuteranopia · #C3D3FF
tritanopia · #00FCF5

Roughly one man in twelve has some form of colour vision deficiency. If any of the three panels above is hard to tell apart from a neighbouring colour in your palette, add a shape, an icon or a label so the meaning does not rest on hue alone.

Color scale — 50 to 950

A Tailwind-shaped ramp built around this exact hex. #28f2fe is pinned to step 500; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F1FDFE
#E3FBFC
#C0F8FB
#8FF8FE
#57F5FE
#28f2fe
#01E6F4
#01C0CB
#0199A2
#056F75
#034549
Base = 500Lightest = 50 · #F1FDFEDarkest = 950 · #034549Text step on white = 900
Perceptual ramp — OKLCH

The same eleven steps expressed in OKLCH, where equal lightness numbers actually look equally spaced. HSL ramps go muddy in the yellows and washed out in the blues; this one does not. Modern browsers render it natively — the hex ramp above is the fallback.

50100200300400500600700800900950
oklch tokensclick to select
:root {
  --brand-50: oklch(0.97 0.036 201.5);
  --brand-100: oklch(0.94 0.058 201.5);
  --brand-200: oklch(0.88 0.086 201.5);
  --brand-300: oklch(0.80 0.112 201.5);
  --brand-400: oklch(0.72 0.133 201.5);
  --brand-500: oklch(0.64 0.144 201.5);
  --brand-600: oklch(0.56 0.144 201.5);
  --brand-700: oklch(0.48 0.135 201.5);
  --brand-800: oklch(0.40 0.121 201.5);
  --brand-900: oklch(0.32 0.101 201.5);
  --brand-950: oklch(0.24 0.079 201.5);
}

Colors that work with #28f2fe

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

Text on it#000000
Black wins here
Surface#F4FAFA
Tinted page background
Border#C0EAED
Hairlines and dividers
Muted text#4B969B
Captions on the surface
Accent#FF2751
Second voice, not a rival
Dark variant#01787F
Hover, pressed, headers
Light variant#E6FDFF
Selected rows, tints
Dark surface#142424
Dark-mode background
Hover#04F0FE
One step down in lightness
Pressed#01D1DD
Two steps down
Disabled#C0D5D6
Chroma pulled out
Focus ring#3BF4FF
Offset from the fill so it reads
Light mode
Everything in its place

Surface, border, heading and body all derive from this one hue, so the screen stays coherent without a second palette.

Primary actionSecondaryBadge
Dark mode
Same hue, inverted

Lightness flips, hue holds. The accent stays the anchor in both themes.

Primary actionSecondaryAccent

In real components

The same eight roles, wired into the interface patterns you will actually build with them. Every state below is a computed value, not a mock-up.

Buttons and states
Save changesHoverPressedDisabled
OutlineSubtleLinkFocused
Form field
you@company.com

Focus ring uses the light variant so the field still reads as one shape.

Send me product updates
Notice
Your export is ready

The file stays available for seven days. Download it before it expires.

NewBetaDraft
Data
Storage used68%
Acme LtdActive
NorthwindTrial
GlobexActive

How to use #28f2fe

Derived from its contrast, chroma and lightness — not from taste.

Works well for
  • Text and icons on dark surfaces
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Brand accents, badges and data highlights
  • Chart series and data categories
Use with care
  • Text of any size on white — fails WCAG AA
  • Full-page backgrounds — tiring over long sessions
  • Thin strokes and 1px borders — they disappear on light UI
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
Not as text
Safe as a fill behind white type
No — use #01787F
Safe as a 1px border on white
No — use #01A1AB

Meaning and mood

What a colour in this family tends to signal, and how this particular chroma and lightness change the reading.

cleantechnicalfreshclinical

Cyan reads as water, air and infrastructure: cool, hygienic, engineered.

At this chroma the association is amplified — it will dominate anything placed beside it, so give it space and use it sparingly. The mid lightness keeps it versatile in both themes.

Worth knowing

At high lightness it disappears into white surfaces and thin strokes vanish entirely.

Reads as
  • FormalityLow
  • EnergyHigh
  • Weight42/100
  • TemperatureCool
  • ApproachabilityReserved

Colour associations are cultural and vary by market. Treat these as a starting point for a conversation with your audience, not a finding about them.

Similar colors

One move away from this hex in each direction. Every swatch is its own page.

Color relationships

The wheel positions with their names attached, so you can grab the one you actually need.

Complementary#FE3428
Analogous left#28FE9F
Analogous right#2887FE
Split-complement 1#FE2887
Split-complement 2#FE9F28
Triadic 1#FE28F2
Triadic 2#F2FE28
Tetradic#9F28FE
On the wheel
Base+30°−30°+120°+240°+180°183°

#28f2fe sits at 183°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red15.7%
Green94.9%
Blue99.6%
R · 0–255
40
0x28
G · 0–255
242
0xf2
B · 0–255
254
0xfe

CMYK percentages

Cyan84.3%
Magenta4.7%
Yellow0.0%
Key (black)0.4%

Total ink coverage is 89%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#28f2fe text on a black background

contrast 15.22:1

Card sample

#28f2fe text on a white background

contrast 1.38:1

Card sample

#28f2fe on grey

1.26:1

#28f2fe on its own surface

1.31:1

#28f2fe on its dark surface

11.64:1

CSS3 live lab

Text font color

The quick brown fox

color: #28f2fe;
Background color
Panel with #28f2fe background
background-color: #28f2fe;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #28f2fe;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(40, 242, 254, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(40, 242, 254, 0.45);
Border & gradient
Gradient panel
border: 3px solid #28f2fe;
background: linear-gradient(135deg, #28f2fe, #2863FE);
Gradient text

Gradient headline

background: linear-gradient(90deg, #28f2fe, #282DFE);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #28f2fe;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #28f2fe;
caret-color: #28f2fe;
Left rule
Pull quote or callout
border-left: 4px solid #28f2fe;
Ring + tint
Selected chip
background: #E6FDFF;
box-shadow: inset 0 0 0 2px #28f2fe;
Conic badge
68%
background: conic-gradient(#28f2fe 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #28f2fe over white; the bottom row is the same alpha over a checkerboard, so you can see what survives on a photo or a video.

Bottom row of hexes is the flattened result over white — use those when a design tool refuses transparency, or when you need a solid fallback.

alpha in every syntaxclick to select
rgba(40, 242, 254, 0.5)
rgb(40 242 254 / 50%)
#28f2fe80
hsl(183 99% 58% / 50%)
color-mix(in srgb, #28f2fe 50%, transparent)
Alpha8-digit hexFlat on white
10%#28f2fe1a#EAFEFF
20%#28f2fe33#D4FCFF
40%#28f2fe66#A9FAFF
60%#28f2fe99#7EF7FE
80%#28f2fecc#53F5FE

Gradients from #28f2fe

Six recipes, each built from this hex and shown with the exact CSS that produced it.

Elevation
Same hue, three lightnesses — safe anywhere
background: linear-gradient(135deg, #65F6FE, #28f2fe 45%, #01787F);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #28f2fe, #0939FE);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #28f2fe, #FE3428);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #83F7FE 0%, #28f2fe 45%, #01787F 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4FAFA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #5BFEA8 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #4688FE 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #01787F 0%, transparent 65%), #28f2fe;

Monochromatic scale

Palettes built from #28f2fe

Shades — darker

Tints — lighter

Tones — desaturated

Color harmonies

Nearest named colors

Ranked with CIEDE2000 across all 139 CSS keywords. Under ΔE 2 the eye stops telling them apart; over ΔE 10 they are plainly different colors.

#28f2fe in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Industries
TechnologyTravelHealthcareMedia
Common UI roles
ButtonsLinksFocus statesCharts
Print note

Sits outside most CMYK gamuts — expect a duller press result, or specify a spot ink.

On screens

Holds up across typical panel gamma. Still worth checking on an uncalibrated laptop, where mid-tones shift most.

In dark mode

Usable as-is on a dark surface at 15.22:1.

Explore nearby colors

Small, deliberate steps away from this hex — useful when you are hunting for the version of a colour that finally feels right.

#28f2fe, answered

What color is #28f2fe?

#28f2fe is a balanced electric cyan, closest to Cyan (ΔE2000 4.8). It sits at 183° on the hue wheel with 99% saturation and 58% lightness, which reads as cool.

What is the RGB value of #28f2fe?

rgb(40, 242, 254) — 40 red, 242 green and 254 blue out of 255, or 15.7% / 94.9% / 99.6% by channel.

What is #28f2fe in HSL and HSV?

hsl(183, 99%, 58%) and hsv(183, 84%, 100%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #28f2fe a light or a dark color?

It is a light color. Relative luminance is 0.7111 and perceived brightness is 81%, so black text on it reaches 15.22:1.

Should I use black or white text on #28f2fe?

Black. It scores 15.22:1 against #28f2fe, versus 1.38:1 for white — AAA at any size.

Is #28f2fe accessible on a white background?

#28f2fe on white scores 1.38:1, which fails WCAG AA at every size. Darken it to #017F87 to reach 4.5:1, or #006369 for 7:1.

What is the complementary color of #28f2fe?

#FE3428 sits directly opposite on the wheel. Softer options are the split-complements #FE2887 and #FE9F28, which give the same contrast with far less vibration.

What colors go well with #28f2fe?

For interface work: #F4FAFA as the surface, #C0EAED for borders, #4B969B for secondary text, #FF2751 as an accent and #01787F for hover and pressed states. For a palette, the analogous pair #28FE9F and #2887FE stays calm, while #FE3428 is the loudest partner.

What is #28f2fe in CMYK for printing?

cmyk(84%, 5%, 0%, 0%). This is a screen-to-ink approximation — a color this saturated sits outside most CMYK gamuts and will print duller than it looks here.

Is #28f2fe warm or cool?

Cool — it scores 89 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #28FEBC; nudged cooler, #27C2FF.

Which Tailwind color is closest to #28f2fe?

The cyan family — its 500 step is #06b6d4, ΔE2000 15.8 away. That is a visible difference, so define #28f2fe as a custom token rather than reaching for the built-in.

How do I use #28f2fe in Tailwind CSS?

Inline it as an arbitrary value with bg-[#28f2fe] or text-[#28f2fe], or register the whole ramp under theme.extend.colors.brand so you get bg-brand-500 and friends. The generated 50–950 scale on this page is ready to paste into your config.

What is #28f2fe with 50% opacity?

rgba(40, 242, 254, 0.5), or #28f2fe80 in eight-digit hex. Over white that composites to #94F9FF; over black, #14797F.

Is #28f2fe a web-safe color?

No. The nearest web-safe colour is #33FFFF, ΔE2000 4.6 away. The palette only matters for legacy displays and some email clients now.

What does the color #28f2fe mean?

As a cyan, it reads clean, technical, fresh. Cyan reads as water, air and infrastructure: cool, hygienic, engineered. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #28f2fe?

The safest is same-hue elevation: linear-gradient(135deg, #65F6FE, #28f2fe 45%, #01787F). For more colour, a short hue run to #0939FE keeps it rich without turning muddy.

Work with #28f2fe in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #28f2fe at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.