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cyan · cool

#4deeeb

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

Token name suggestion: Atlas Reef

RGB
77, 238, 235
HSL
179°, 83%, 62%
CMYK
68, 0, 1, 7
Luminance
0.6873

#4deeeb is a balanced electric cyan, 179° on the wheel and 87/100 on the cool side. Put black text on it (14.75:1). As text it scores 1.42:1 on white — use #0C817F instead. Nearest name is Cyan, nearest Tailwind family is teal.

hsl(179 83% 62%)rgb(77 238 235)Base step 400AAA inkCool

At a glance

Every number on this page in one read: what #4deeeb is made of, how bright it looks, and which way it leans.

Hex
#4deeeb
Hue
179°
cyan
Saturation
83%
electric
Lightness
62%
balanced
Brightness
93%
HSV value
Perceived
80%
weighted brightness
Luminance
0.6873
WCAG relative
Temperature
Cool
87/100 cool
Color family
Cyan
Tone
Electric
Best ink
Black
14.75:1
Closest name
Cyan
ΔE2000 4
Chroma
42.7
LCH, 0–130ish
OKLCH L
0.867
perceptual lightness
Tailwind
teal
500 · ΔE 14.7
Web-safe
#66FFFF
nearest of 216
Where it sits
Hue179° of 360°
Saturation83%
Lightness62%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #4deeeb.

Temperature
Warm ← → Cool87% 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
Red2%
Green89%
Blue9%

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

Every format

HEX#4deeeb
HEX (8-digit)#4deeebff
RGBrgb(77, 238, 235)
RGBArgba(77, 238, 235, 1)
HSLhsl(179, 83%, 62%)
HSV / HSBhsv(179, 68%, 93%)
HWBhwb(179 30% 7%)
CMYKcmyk(68%, 0%, 1%, 7%)
LABlab(86.4 -41.3 -10.7)
LCHlch(86.4 42.7 194.5)
OKLCHoklch(0.867 0.131 193.2)
XYZ (D65)xyz(48.62, 68.72, 89.28)
Decimal5107435
Display P3color(display-p3 0.302 0.933 0.922)
Web-safe#66FFFF

Copy-ready code

every platformclick to select
/* CSS */
color: #4deeeb;
background-color: #4deeeb;
/* CSS custom property */
--brand: #4deeeb;
/* Tailwind (arbitrary) */
class="text-[#4deeeb] bg-[#4deeeb]"
/* SCSS */
$brand: #4deeeb;
/* SwiftUI */
Color(red: 0.302, green: 0.933, blue: 0.922)
/* UIKit */
UIColor(red: 0.302, green: 0.933, blue: 0.922, alpha: 1)
/* Android XML */
<color name="brand">#4DEEEB</color>
/* Android Compose */
Color(0xFF4DEEEB)
/* Flutter */
Color(0xFF4DEEEB)
/* Python / OpenCV (BGR) */
(235, 238, 77)
/* Python / PIL (RGB) */
(77, 238, 235)
/* Java AWT */
new Color(77, 238, 235)
/* .NET */
Color.FromArgb(255, 77, 238, 235)
/* OpenGL / Unity (0–1) */
(0.3020f, 0.9333f, 0.9216f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{77,238,235}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #4deeeb 85%, white);
border-color: color-mix(in oklab, #4deeeb 40%, transparent);
/* theme-aware in one line */
color: light-dark(#0B7472, #D3EEEE);
/* relative colour syntax */
--hover: hsl(from #4deeeb 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: #F2FCFC;
  --brand-100: #E6FAF9;
  --brand-200: #C6F6F5;
  --brand-300: #99F5F4;
  --brand-400: #4deeeb;
  --brand-500: #32EBE8;
  --brand-600: #15E0DC;
  --brand-700: #12BAB7;
  --brand-800: #0E9593;
  --brand-900: #0F6C6A;
  --brand-950: #094342;
  --brand: #4deeeb;
  --brand-ink: #000000;
  --brand-surface: #F4FAFA;
  --brand-border: #C0EDEC;
  --brand-hover: #2DEBE7;
  --brand-pressed: #15DFDB;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142424;
    --brand-ink: #D3EEEE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F2FCFC',
        100: '#E6FAF9',
        200: '#C6F6F5',
        300: '#99F5F4',
        400: '#4deeeb',
        500: '#32EBE8',
        600: '#15E0DC',
        700: '#12BAB7',
        800: '#0E9593',
        900: '#0F6C6A',
        950: '#094342',
        DEFAULT: '#4deeeb',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F2FCFC,
  '100': #E6FAF9,
  '200': #C6F6F5,
  '300': #99F5F4,
  '400': #4deeeb,
  '500': #32EBE8,
  '600': #15E0DC,
  '700': #12BAB7,
  '800': #0E9593,
  '900': #0F6C6A,
  '950': #094342,
);
$brand-base: #4deeeb;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F2FCFC", "$type": "color" },
      "100": { "$value": "#E6FAF9", "$type": "color" },
      "200": { "$value": "#C6F6F5", "$type": "color" },
      "300": { "$value": "#99F5F4", "$type": "color" },
      "400": { "$value": "#4deeeb", "$type": "color" },
      "500": { "$value": "#32EBE8", "$type": "color" },
      "600": { "$value": "#15E0DC", "$type": "color" },
      "700": { "$value": "#12BAB7", "$type": "color" },
      "800": { "$value": "#0E9593", "$type": "color" },
      "900": { "$value": "#0F6C6A", "$type": "color" },
      "950": { "$value": "#094342", "$type": "color" }
    },
    "brandInk": { "$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 #4deeeb · 14.75:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 1.42:1
AA fail · AA large fail · AAA fail
Aa
Black text · 14.75:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #4deeeb as text scores 1.42:1 on white and 14.75:1 on black.
Best tinted ink on it, if plain black or white feels flat: #0B7472 at 3.93:1.

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
#0C817F · 4.71:1
AA on white−34% L
#0C817F
The quick fox
#09615F · 7.27:1
AAA on white−41% L
#09615F
The quick fox
#4deeeb · 14.75:1
AA on blackalready passes
#4deeeb
The quick fox
#4deeeb · 14.75:1
AAA on blackalready passes
#4deeeb

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #0FA29F 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
#4deeeb on white: 1.42:1
AA ✗ fail · AA-large · AAA
Aa
#4deeeb on black: 14.75:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #4deeeb as text on that neutral, and that neutral as text on #4deeeb.

NeutralRatioBoth directions
White1.42:1AaAa
Slate 501.36:1AaAa
Slate 1001.30:1AaAa
Slate 2001.16:1AaAa
Slate 3001.04:1AaAa
Slate 4001.80:1AaAa
Slate 5003.34:1AaAa
Slate 6005.32:1AaAa
Slate 7007.27:1AaAa
Slate 80010.27:1AaAa
Slate 90012.54:1AaAa
Black14.75:1AaAa
Colour vision deficiency
true color
protanopia · #DFE2EB
deuteranopia · #C7D1EC
tritanopia · #00F5ED

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. #4deeeb is pinned to step 400; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F2FCFC
#E6FAF9
#C6F6F5
#99F5F4
#4deeeb
#32EBE8
#15E0DC
#12BAB7
#0E9593
#0F6C6A
#094342
Base = 400Lightest = 50 · #F2FCFCDarkest = 950 · #094342Text 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 0.033 193.2);
  --brand-100: oklch(0.94 0.052 193.2);
  --brand-200: oklch(0.88 0.078 193.2);
  --brand-300: oklch(0.80 0.102 193.2);
  --brand-400: oklch(0.72 0.120 193.2);
  --brand-500: oklch(0.64 0.131 193.2);
  --brand-600: oklch(0.56 0.131 193.2);
  --brand-700: oklch(0.48 0.123 193.2);
  --brand-800: oklch(0.40 0.110 193.2);
  --brand-900: oklch(0.32 0.091 193.2);
  --brand-950: oklch(0.24 0.072 193.2);
}

Colors that work with #4deeeb

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#C0EDEC
Hairlines and dividers
Muted text#4B9B99
Captions on the surface
Accent#F24977
Second voice, not a rival
Dark variant#0B7472
Hover, pressed, headers
Light variant#E8FDFC
Selected rows, tints
Dark surface#142424
Dark-mode background
Hover#2DEBE7
One step down in lightness
Pressed#15DFDB
Two steps down
Disabled#CDDFDE
Chroma pulled out
Focus ring#57F9F6
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 #4deeeb

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 #0B7472
Safe as a 1px border on white
No — use #0FA29F

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
  • Weight38/100
  • 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#EE4D50
Analogous left#4DEE9B
Analogous right#4DA1EE
Split-complement 1#EE4DA1
Split-complement 2#EE9B4D
Triadic 1#EB4DEE
Triadic 2#EEEB4D
Tetradic#9B4DEE
On the wheel
Base+30°−30°+120°+240°+180°179°

#4deeeb sits at 179°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red30.2%
Green93.3%
Blue92.2%
R · 0–255
77
0x4d
G · 0–255
238
0xee
B · 0–255
235
0xeb

CMYK percentages

Cyan67.6%
Magenta0.0%
Yellow1.3%
Key (black)6.7%

Total ink coverage is 76%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#4deeeb text on a black background

contrast 14.75:1

Card sample

#4deeeb text on a white background

contrast 1.42:1

Card sample

#4deeeb on grey

1.30:1

#4deeeb on its own surface

1.35:1

#4deeeb on its dark surface

11.28:1

CSS3 live lab

Text font color

The quick brown fox

color: #4deeeb;
Background color
Panel with #4deeeb background
background-color: #4deeeb;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #4deeeb;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(77, 238, 235, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(77, 238, 235, 0.45);
Border & gradient
Gradient panel
border: 3px solid #4deeeb;
background: linear-gradient(135deg, #4deeeb, #4D86EE);
Gradient text

Gradient headline

background: linear-gradient(90deg, #4deeeb, #4D5DEE);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #4deeeb;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #4deeeb;
caret-color: #4deeeb;
Left rule
Pull quote or callout
border-left: 4px solid #4deeeb;
Ring + tint
Selected chip
background: #E8FDFC;
box-shadow: inset 0 0 0 2px #4deeeb;
Conic badge
68%
background: conic-gradient(#4deeeb 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #4deeeb 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(77, 238, 235, 0.5)
rgb(77 238 235 / 50%)
#4deeeb80
hsl(179 83% 62% / 50%)
color-mix(in srgb, #4deeeb 50%, transparent)
Alpha8-digit hexFlat on white
10%#4deeeb1a#EDFDFD
20%#4deeeb33#DBFCFB
40%#4deeeb66#B8F8F7
60%#4deeeb99#94F5F3
80%#4deeebcc#71F1EF

Gradients from #4deeeb

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, #85F3F1, #4deeeb 45%, #0B7472);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #4deeeb, #3163EB);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #4deeeb, #EE4D50);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #A1F6F4 0%, #4deeeb 45%, #0B7472 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%, #7CF2AB 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #69A4F1 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #0B7472 0%, transparent 65%), #4deeeb;

Monochromatic scale

Palettes built from #4deeeb

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.

#4deeeb 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 14.75:1.

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.

#4deeeb, answered

What color is #4deeeb?

#4deeeb is a balanced electric cyan, closest to Cyan (ΔE2000 4). It sits at 179° on the hue wheel with 83% saturation and 62% lightness, which reads as cool.

What is the RGB value of #4deeeb?

rgb(77, 238, 235) — 77 red, 238 green and 235 blue out of 255, or 30.2% / 93.3% / 92.2% by channel.

What is #4deeeb in HSL and HSV?

hsl(179, 83%, 62%) and hsv(179, 68%, 93%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #4deeeb a light or a dark color?

It is a light color. Relative luminance is 0.6873 and perceived brightness is 80%, so black text on it reaches 14.75:1.

Should I use black or white text on #4deeeb?

Black. It scores 14.75:1 against #4deeeb, versus 1.42:1 for white — AAA at any size.

Is #4deeeb accessible on a white background?

#4deeeb on white scores 1.42:1, which fails WCAG AA at every size. Darken it to #0C817F to reach 4.5:1, or #09615F for 7:1.

What is the complementary color of #4deeeb?

#EE4D50 sits directly opposite on the wheel. Softer options are the split-complements #EE4DA1 and #EE9B4D, which give the same contrast with far less vibration.

What colors go well with #4deeeb?

For interface work: #F4FAFA as the surface, #C0EDEC for borders, #4B9B99 for secondary text, #F24977 as an accent and #0B7472 for hover and pressed states. For a palette, the analogous pair #4DEE9B and #4DA1EE stays calm, while #EE4D50 is the loudest partner.

What is #4deeeb in CMYK for printing?

cmyk(68%, 0%, 1%, 7%). 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 #4deeeb warm or cool?

Cool — it scores 87 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #4DEEB0; nudged cooler, #4BC2F0.

Which Tailwind color is closest to #4deeeb?

The teal family — its 500 step is #14b8a6, ΔE2000 14.7 away. That is a visible difference, so define #4deeeb as a custom token rather than reaching for the built-in.

How do I use #4deeeb in Tailwind CSS?

Inline it as an arbitrary value with bg-[#4deeeb] or text-[#4deeeb], 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 #4deeeb with 50% opacity?

rgba(77, 238, 235, 0.5), or #4deeeb80 in eight-digit hex. Over white that composites to #A6F7F5; over black, #277776.

Is #4deeeb a web-safe color?

No. The nearest web-safe colour is #66FFFF, ΔE2000 4 away. The palette only matters for legacy displays and some email clients now.

What does the color #4deeeb 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 #4deeeb?

The safest is same-hue elevation: linear-gradient(135deg, #85F3F1, #4deeeb 45%, #0B7472). For more colour, a short hue run to #3163EB keeps it rich without turning muddy.

Work with #4deeeb in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #4deeeb at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.