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blue · cool

#4fc0fd

a light, electric blue · cool · closest name: Deep Sky Blue

Token name suggestion: Linen Harbour

RGB
79, 192, 253
HSL
201°, 98%, 65%
CMYK
69, 24, 0, 1
Luminance
0.4645

#4fc0fd is a light electric blue, 201° on the wheel and 96/100 on the cool side. Put black text on it (10.29:1). As text it scores 2.04:1 on white — use #027ABB instead. Nearest name is Deep Sky Blue, nearest Tailwind family is sky.

hsl(201 98% 65%)rgb(79 192 253)Base step 400AAA inkCool

At a glance

Every number on this page in one read: what #4fc0fd is made of, how bright it looks, and which way it leans.

Hex
#4fc0fd
Hue
201°
blue
Saturation
98%
electric
Lightness
65%
light
Brightness
99%
HSV value
Perceived
69%
weighted brightness
Luminance
0.4645
WCAG relative
Temperature
Cool
96/100 cool
Color family
Blue
Tone
Electric
Best ink
Black
10.29:1
Closest name
Deep Sky Blue
ΔE2000 2.8
Chroma
41.5
LCH, 0–130ish
OKLCH L
0.768
perceptual lightness
Tailwind
sky
500 · ΔE 7.8
Web-safe
#66CCFF
nearest of 216
Where it sits
Hue201° of 360°
Saturation98%
Lightness65%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #4fc0fd.

Temperature
Warm ← → Cool96% 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
Red4%
Green81%
Blue15%

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

Every format

HEX#4fc0fd
HEX (8-digit)#4fc0fdff
RGBrgb(79, 192, 253)
RGBArgba(79, 192, 253, 1)
HSLhsl(201, 98%, 65%)
HSV / HSBhsv(201, 69%, 99%)
HWBhwb(201 31% 1%)
CMYKcmyk(69%, 24%, 0%, 1%)
LABlab(73.8 -13.2 -39.4)
LCHlch(73.8 41.5 251.5)
OKLCHoklch(0.768 0.134 236.0)
XYZ (D65)xyz(39.80, 46.45, 99.78)
Decimal5226749
Display P3color(display-p3 0.310 0.753 0.992)
Web-safe#66CCFF

Copy-ready code

every platformclick to select
/* CSS */
color: #4fc0fd;
background-color: #4fc0fd;
/* CSS custom property */
--brand: #4fc0fd;
/* Tailwind (arbitrary) */
class="text-[#4fc0fd] bg-[#4fc0fd]"
/* SCSS */
$brand: #4fc0fd;
/* SwiftUI */
Color(red: 0.310, green: 0.753, blue: 0.992)
/* UIKit */
UIColor(red: 0.310, green: 0.753, blue: 0.992, alpha: 1)
/* Android XML */
<color name="brand">#4FC0FD</color>
/* Android Compose */
Color(0xFF4FC0FD)
/* Flutter */
Color(0xFF4FC0FD)
/* Python / OpenCV (BGR) */
(253, 192, 79)
/* Python / PIL (RGB) */
(79, 192, 253)
/* Java AWT */
new Color(79, 192, 253)
/* .NET */
Color.FromArgb(255, 79, 192, 253)
/* OpenGL / Unity (0–1) */
(0.3098f, 0.7529f, 0.9922f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{79,192,253}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #4fc0fd 85%, white);
border-color: color-mix(in oklab, #4fc0fd 40%, transparent);
/* theme-aware in one line */
color: light-dark(#01527E, #D3E5EE);
/* relative colour syntax */
--hover: hsl(from #4fc0fd 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: #F1F9FD;
  --brand-100: #E3F3FC;
  --brand-200: #C1E7FB;
  --brand-300: #90D7FE;
  --brand-400: #4fc0fd;
  --brand-500: #21B0FD;
  --brand-600: #039EF2;
  --brand-700: #0284CA;
  --brand-800: #026AA1;
  --brand-900: #064E74;
  --brand-950: #043149;
  --brand: #4fc0fd;
  --brand-ink: #000000;
  --brand-surface: #F4F8FA;
  --brand-border: #C0DDED;
  --brand-hover: #2CB4FD;
  --brand-pressed: #08A7FC;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #141F24;
    --brand-ink: #D3E5EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F1F9FD',
        100: '#E3F3FC',
        200: '#C1E7FB',
        300: '#90D7FE',
        400: '#4fc0fd',
        500: '#21B0FD',
        600: '#039EF2',
        700: '#0284CA',
        800: '#026AA1',
        900: '#064E74',
        950: '#043149',
        DEFAULT: '#4fc0fd',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F1F9FD,
  '100': #E3F3FC,
  '200': #C1E7FB,
  '300': #90D7FE,
  '400': #4fc0fd,
  '500': #21B0FD,
  '600': #039EF2,
  '700': #0284CA,
  '800': #026AA1,
  '900': #064E74,
  '950': #043149,
);
$brand-base: #4fc0fd;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F1F9FD", "$type": "color" },
      "100": { "$value": "#E3F3FC", "$type": "color" },
      "200": { "$value": "#C1E7FB", "$type": "color" },
      "300": { "$value": "#90D7FE", "$type": "color" },
      "400": { "$value": "#4fc0fd", "$type": "color" },
      "500": { "$value": "#21B0FD", "$type": "color" },
      "600": { "$value": "#039EF2", "$type": "color" },
      "700": { "$value": "#0284CA", "$type": "color" },
      "800": { "$value": "#026AA1", "$type": "color" },
      "900": { "$value": "#064E74", "$type": "color" },
      "950": { "$value": "#043149", "$type": "color" }
    },
    "brandInk": { "$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 #4fc0fd · 10.29:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 2.04:1
AA fail · AA large fail · AAA fail
Aa
Black text · 10.29:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #4fc0fd as text scores 2.04:1 on white and 10.29:1 on black.
Best tinted ink on it, if plain black or white feels flat: #01527E at 4.10:1.

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
#027ABB · 4.66:1
AA on white−28% L
#027ABB
The quick fox
#025D8E · 7.10:1
AAA on white−37% L
#025D8E
The quick fox
#4fc0fd · 10.29:1
AA on blackalready passes
#4fc0fd
The quick fox
#4fc0fd · 10.29:1
AAA on blackalready passes
#4fc0fd

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #039BEE 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
#4fc0fd on white: 2.04:1
AA ✗ fail · AA-large · AAA
Aa
#4fc0fd on black: 10.29:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #4fc0fd as text on that neutral, and that neutral as text on #4fc0fd.

NeutralRatioBoth directions
White2.04:1AaAa
Slate 501.95:1AaAa
Slate 1001.86:1AaAa
Slate 2001.66:1AaAa
Slate 3001.37:1AaAa
Slate 4001.26:1AaAa
Slate 5002.33:1AaAa
Slate 6003.71:1AaAa
Slate 7005.07:1AaAa
Slate 8007.17:1AaAa
Slate 9008.75:1AaAa
Black10.29:1AaAa
Colour vision deficiency
true color
protanopia · #A3BFFF
deuteranopia · #8BAEFC
tritanopia · #00D0D5

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. #4fc0fd 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.

#F1F9FD
#E3F3FC
#C1E7FB
#90D7FE
#4fc0fd
#21B0FD
#039EF2
#0284CA
#026AA1
#064E74
#043149
Base = 400Lightest = 50 · #F1F9FDDarkest = 950 · #043149Text step on white = 800
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 0.033 236.0);
  --brand-100: oklch(0.94 0.053 236.0);
  --brand-200: oklch(0.88 0.080 236.0);
  --brand-300: oklch(0.80 0.104 236.0);
  --brand-400: oklch(0.72 0.123 236.0);
  --brand-500: oklch(0.64 0.134 236.0);
  --brand-600: oklch(0.56 0.134 236.0);
  --brand-700: oklch(0.48 0.126 236.0);
  --brand-800: oklch(0.40 0.112 236.0);
  --brand-900: oklch(0.32 0.094 236.0);
  --brand-950: oklch(0.24 0.073 236.0);
}

Colors that work with #4fc0fd

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#F4F8FA
Tinted page background
Border#C0DDED
Hairlines and dividers
Muted text#4B7F9B
Captions on the surface
Accent#CC1500
Second voice, not a rival
Dark variant#01527E
Hover, pressed, headers
Light variant#E6F6FF
Selected rows, tints
Dark surface#141F24
Dark-mode background
Hover#2CB4FD
One step down in lightness
Pressed#08A7FC
Two steps down
Disabled#D7E0E5
Chroma pulled out
Focus ring#61C8FF
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 #4fc0fd

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
  • Card and section backgrounds
  • Brand accents, badges and data highlights
Use with care
  • Text of any size on white — fails WCAG AA
  • Full-page backgrounds — tiring over long sessions
  • White text placed on it
  • 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 #01527E
Safe as a 1px border on white
No — use #039BEE

Meaning and mood

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

trustedcalmcompetentcorporate

The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed.

At this chroma the association is amplified — it will dominate anything placed beside it, so give it space and use it sparingly. The lightness keeps it airy and approachable.

Worth knowing

It is also the most crowded hue on the web. Distinctiveness has to come from your other choices.

Reads as
  • FormalityLow
  • EnergyHigh
  • Weight35/100
  • 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#FD8C4F
Analogous left#4FFDE3
Analogous right#4F69FD
Split-complement 1#FD4F69
Split-complement 2#FDE34F
Triadic 1#FD4FC0
Triadic 2#C0FD4F
Tetradic#E34FFD
On the wheel
Base+30°−30°+120°+240°+180°201°

#4fc0fd sits at 201°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red31.0%
Green75.3%
Blue99.2%
R · 0–255
79
0x4f
G · 0–255
192
0xc0
B · 0–255
253
0xfd

CMYK percentages

Cyan68.8%
Magenta24.1%
Yellow0.0%
Key (black)0.8%

Total ink coverage is 94%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#4fc0fd text on a black background

contrast 10.29:1

Card sample

#4fc0fd text on a white background

contrast 2.04:1

Card sample

#4fc0fd on grey

1.86:1

#4fc0fd on its own surface

1.91:1

#4fc0fd on its dark surface

8.22:1

CSS3 live lab

Text font color

The quick brown fox

color: #4fc0fd;
Background color
Panel with #4fc0fd background
background-color: #4fc0fd;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #4fc0fd;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(79, 192, 253, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(79, 192, 253, 0.45);
Border & gradient
Gradient panel
border: 3px solid #4fc0fd;
background: linear-gradient(135deg, #4fc0fd, #524FFD);
Gradient text

Gradient headline

background: linear-gradient(90deg, #4fc0fd, #7D4FFD);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #4fc0fd;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #4fc0fd;
caret-color: #4fc0fd;
Left rule
Pull quote or callout
border-left: 4px solid #4fc0fd;
Ring + tint
Selected chip
background: #E6F6FF;
box-shadow: inset 0 0 0 2px #4fc0fd;
Conic badge
68%
background: conic-gradient(#4fc0fd 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #4fc0fd 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(79, 192, 253, 0.5)
rgb(79 192 253 / 50%)
#4fc0fd80
hsl(201 98% 65% / 50%)
color-mix(in srgb, #4fc0fd 50%, transparent)
Alpha8-digit hexFlat on white
10%#4fc0fd1a#EDF9FF
20%#4fc0fd33#DCF2FF
40%#4fc0fd66#B9E6FE
60%#4fc0fd99#95D9FE
80%#4fc0fdcc#72CDFD

Gradients from #4fc0fd

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, #8BD6FE, #4fc0fd 45%, #01527E);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #4fc0fd, #4531FD);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #4fc0fd, #FD8C4F);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #AAE1FE 0%, #4fc0fd 45%, #01527E 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4F8FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #81FEE1 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #6D77FD 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #01527E 0%, transparent 65%), #4fc0fd;

Monochromatic scale

Palettes built from #4fc0fd

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.

#4fc0fd in the real world

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

Industries
TechnologyFinanceHealthcareEnterprise SaaS
Common UI roles
SurfacesBadgesHighlightsEmpty states
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 10.29:1.

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.

#4fc0fd, answered

What color is #4fc0fd?

#4fc0fd is a light electric blue, closest to Deep Sky Blue (ΔE2000 2.8). It sits at 201° on the hue wheel with 98% saturation and 65% lightness, which reads as cool.

What is the RGB value of #4fc0fd?

rgb(79, 192, 253) — 79 red, 192 green and 253 blue out of 255, or 31% / 75.3% / 99.2% by channel.

What is #4fc0fd in HSL and HSV?

hsl(201, 98%, 65%) and hsv(201, 69%, 99%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #4fc0fd a light or a dark color?

It is a mid-tone. Relative luminance is 0.4645 and perceived brightness is 69%, so black text on it reaches 10.29:1.

Should I use black or white text on #4fc0fd?

Black. It scores 10.29:1 against #4fc0fd, versus 2.04:1 for white — AAA at any size.

Is #4fc0fd accessible on a white background?

#4fc0fd on white scores 2.04:1, which fails WCAG AA at every size. Darken it to #027ABB to reach 4.5:1, or #025D8E for 7:1.

What is the complementary color of #4fc0fd?

#FD8C4F sits directly opposite on the wheel. Softer options are the split-complements #FD4F69 and #FDE34F, which give the same contrast with far less vibration.

What colors go well with #4fc0fd?

For interface work: #F4F8FA as the surface, #C0DDED for borders, #4B7F9B for secondary text, #CC1500 as an accent and #01527E for hover and pressed states. For a palette, the analogous pair #4FFDE3 and #4F69FD stays calm, while #FD8C4F is the loudest partner.

What is #4fc0fd in CMYK for printing?

cmyk(69%, 24%, 0%, 1%). 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 #4fc0fd warm or cool?

Cool — it scores 96 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #4FFDFA; nudged cooler, #34A5FF.

Which Tailwind color is closest to #4fc0fd?

The sky family — its 500 step is #0ea5e9, ΔE2000 7.8 away. That is a visible difference, so define #4fc0fd as a custom token rather than reaching for the built-in.

How do I use #4fc0fd in Tailwind CSS?

Inline it as an arbitrary value with bg-[#4fc0fd] or text-[#4fc0fd], 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 #4fc0fd with 50% opacity?

rgba(79, 192, 253, 0.5), or #4fc0fd80 in eight-digit hex. Over white that composites to #A7E0FE; over black, #28607F.

Is #4fc0fd a web-safe color?

No. The nearest web-safe colour is #66CCFF, ΔE2000 3.7 away. The palette only matters for legacy displays and some email clients now.

What does the color #4fc0fd mean?

As a blue, it reads trusted, calm, competent. The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed. At this chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #4fc0fd?

The safest is same-hue elevation: linear-gradient(135deg, #8BD6FE, #4fc0fd 45%, #01527E). For more colour, a short hue run to #4531FD keeps it rich without turning muddy.

Work with #4fc0fd in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #4fc0fd at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.