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cyan · cool

#78b5cd

a balanced, vivid cyan · cool · closest name: Sky Blue

Token name suggestion: Studio Glacier

RGB
120, 181, 205
HSL
197°, 46%, 64%
CMYK
42, 12, 0, 20
Luminance
0.4145

#78b5cd is a balanced vivid cyan, 197° on the wheel and 95/100 on the cool side. Put black text on it (9.29:1). As text it scores 2.26:1 on white — use #387D97 instead. Nearest name is Sky Blue, nearest Tailwind family is cyan.

hsl(197 46% 64%)rgb(120 181 205)Base step 400AAA inkCool

At a glance

Every number on this page in one read: what #78b5cd is made of, how bright it looks, and which way it leans.

Hex
#78b5cd
Hue
197°
cyan
Saturation
46%
vivid
Lightness
64%
balanced
Brightness
80%
HSV value
Perceived
66%
weighted brightness
Luminance
0.4145
WCAG relative
Temperature
Cool
95/100 cool
Color family
Cyan
Tone
Vivid
Best ink
Black
9.29:1
Closest name
Sky Blue
ΔE2000 6.6
Chroma
22.7
LCH, 0–130ish
OKLCH L
0.740
perceptual lightness
Tailwind
cyan
500 · ΔE 7.6
Web-safe
#66CCCC
nearest of 216
Where it sits
Hue197° of 360°
Saturation46%
Lightness64%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #78b5cd.

Temperature
Warm ← → Cool95% 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
Red10%
Green80%
Blue11%

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

Every format

HEX#78b5cd
HEX (8-digit)#78b5cdff
RGBrgb(120, 181, 205)
RGBArgba(120, 181, 205, 1)
HSLhsl(197, 46%, 64%)
HSV / HSBhsv(197, 41%, 80%)
HWBhwb(197 47% 20%)
CMYKcmyk(42%, 12%, 0%, 20%)
LABlab(70.5 -13.4 -18.3)
LCHlch(70.5 22.7 233.7)
OKLCHoklch(0.740 0.072 224.8)
XYZ (D65)xyz(35.29, 41.45, 63.89)
Decimal7910861
Display P3color(display-p3 0.471 0.710 0.804)
Web-safe#66CCCC

Copy-ready code

every platformclick to select
/* CSS */
color: #78b5cd;
background-color: #78b5cd;
/* CSS custom property */
--brand: #78b5cd;
/* Tailwind (arbitrary) */
class="text-[#78b5cd] bg-[#78b5cd]"
/* SCSS */
$brand: #78b5cd;
/* SwiftUI */
Color(red: 0.471, green: 0.710, blue: 0.804)
/* UIKit */
UIColor(red: 0.471, green: 0.710, blue: 0.804, alpha: 1)
/* Android XML */
<color name="brand">#78B5CD</color>
/* Android Compose */
Color(0xFF78B5CD)
/* Flutter */
Color(0xFF78B5CD)
/* Python / OpenCV (BGR) */
(205, 181, 120)
/* Python / PIL (RGB) */
(120, 181, 205)
/* Java AWT */
new Color(120, 181, 205)
/* .NET */
Color.FromArgb(255, 120, 181, 205)
/* OpenGL / Unity (0–1) */
(0.4706f, 0.7098f, 0.8039f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{120,181,205}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #78b5cd 85%, white);
border-color: color-mix(in oklab, #78b5cd 40%, transparent);
/* theme-aware in one line */
color: light-dark(#224D5D, #D3E6EE);
/* relative colour syntax */
--hover: hsl(from #78b5cd 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: #F5F9FA;
  --brand-100: #EAF2F5;
  --brand-200: #D0E4EB;
  --brand-300: #ADD2E1;
  --brand-400: #78b5cd;
  --brand-500: #5BA5C2;
  --brand-600: #4293B3;
  --brand-700: #377A95;
  --brand-800: #2C6277;
  --brand-900: #234857;
  --brand-950: #162D36;
  --brand: #78b5cd;
  --brand-ink: #000000;
  --brand-surface: #F4F9FA;
  --brand-border: #C3DEE9;
  --brand-hover: #5EA7C3;
  --brand-pressed: #4598B9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142024;
    --brand-ink: #D3E6EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F5F9FA',
        100: '#EAF2F5',
        200: '#D0E4EB',
        300: '#ADD2E1',
        400: '#78b5cd',
        500: '#5BA5C2',
        600: '#4293B3',
        700: '#377A95',
        800: '#2C6277',
        900: '#234857',
        950: '#162D36',
        DEFAULT: '#78b5cd',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F5F9FA,
  '100': #EAF2F5,
  '200': #D0E4EB,
  '300': #ADD2E1,
  '400': #78b5cd,
  '500': #5BA5C2,
  '600': #4293B3,
  '700': #377A95,
  '800': #2C6277,
  '900': #234857,
  '950': #162D36,
);
$brand-base: #78b5cd;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F5F9FA", "$type": "color" },
      "100": { "$value": "#EAF2F5", "$type": "color" },
      "200": { "$value": "#D0E4EB", "$type": "color" },
      "300": { "$value": "#ADD2E1", "$type": "color" },
      "400": { "$value": "#78b5cd", "$type": "color" },
      "500": { "$value": "#5BA5C2", "$type": "color" },
      "600": { "$value": "#4293B3", "$type": "color" },
      "700": { "$value": "#377A95", "$type": "color" },
      "800": { "$value": "#2C6277", "$type": "color" },
      "900": { "$value": "#234857", "$type": "color" },
      "950": { "$value": "#162D36", "$type": "color" }
    },
    "brandInk": { "$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 #78b5cd · 9.29:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 2.26:1
AA fail · AA large fail · AAA fail
Aa
Black text · 9.29:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #78b5cd as text scores 2.26:1 on white and 9.29:1 on black.
Best tinted ink on it, if plain black or white feels flat: #224D5D at 4.06:1.

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
#387D97 · 4.62:1
AA on white−23% L
#387D97
The quick fox
#2A5E72 · 7.14:1
AAA on white−33% L
#2A5E72
The quick fox
#78b5cd · 9.29:1
AA on blackalready passes
#78b5cd
The quick fox
#78b5cd · 9.29:1
AAA on blackalready passes
#78b5cd

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #4B9DBC 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
#78b5cd on white: 2.26:1
AA ✗ fail · AA-large · AAA
Aa
#78b5cd on black: 9.29:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #78b5cd as text on that neutral, and that neutral as text on #78b5cd.

NeutralRatioBoth directions
White2.26:1AaAa
Slate 502.16:1AaAa
Slate 1002.06:1AaAa
Slate 2001.83:1AaAa
Slate 3001.52:1AaAa
Slate 4001.13:1AaAa
Slate 5002.11:1AaAa
Slate 6003.35:1AaAa
Slate 7004.58:1AaAa
Slate 8006.47:1AaAa
Slate 9007.90:1AaAa
Black9.29:1AaAa
Colour vision deficiency
true color
protanopia · #A8B2CE
deuteranopia · #9BA8CD
tritanopia · #55BCBD

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. #78b5cd 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.

#F5F9FA
#EAF2F5
#D0E4EB
#ADD2E1
#78b5cd
#5BA5C2
#4293B3
#377A95
#2C6277
#234857
#162D36
Base = 400Lightest = 50 · #F5F9FADarkest = 950 · #162D36Text step on white = 700
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 0.018 224.8);
  --brand-100: oklch(0.94 0.029 224.8);
  --brand-200: oklch(0.88 0.043 224.8);
  --brand-300: oklch(0.80 0.056 224.8);
  --brand-400: oklch(0.72 0.066 224.8);
  --brand-500: oklch(0.64 0.072 224.8);
  --brand-600: oklch(0.56 0.072 224.8);
  --brand-700: oklch(0.48 0.067 224.8);
  --brand-800: oklch(0.40 0.060 224.8);
  --brand-900: oklch(0.32 0.050 224.8);
  --brand-950: oklch(0.24 0.039 224.8);
}

Colors that work with #78b5cd

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#F4F9FA
Tinted page background
Border#C3DEE9
Hairlines and dividers
Muted text#4B849B
Captions on the surface
Accent#D17774
Second voice, not a rival
Dark variant#224D5D
Hover, pressed, headers
Light variant#ECF5F8
Selected rows, tints
Dark surface#142024
Dark-mode background
Hover#5EA7C3
One step down in lightness
Pressed#4598B9
Two steps down
Disabled#D3DEE3
Chroma pulled out
Focus ring#7FC1DB
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 #78b5cd

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 #224D5D
Safe as a 1px border on white
No — use #4B9DBC

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.

This is a confident chroma: strong enough to lead a brand, restrained enough to live in an interface all day. 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
  • FormalityMedium
  • EnergyMedium-high
  • Weight36/100
  • 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#CD9078
Analogous left#78CDBA
Analogous right#788BCD
Split-complement 1#CD788B
Split-complement 2#CDBA78
Triadic 1#CD78B5
Triadic 2#B5CD78
Tetradic#BA78CD
On the wheel
Base+30°−30°+120°+240°+180°197°

#78b5cd sits at 197°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red47.1%
Green71.0%
Blue80.4%
R · 0–255
120
0x78
G · 0–255
181
0xb5
B · 0–255
205
0xcd

CMYK percentages

Cyan41.5%
Magenta11.7%
Yellow0.0%
Key (black)19.6%

Total ink coverage is 73%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#78b5cd text on a black background

contrast 9.29:1

Card sample

#78b5cd text on a white background

contrast 2.26:1

Card sample

#78b5cd on grey

2.06:1

#78b5cd on its own surface

2.13:1

#78b5cd on its dark surface

7.36:1

CSS3 live lab

Text font color

The quick brown fox

color: #78b5cd;
Background color
Panel with #78b5cd background
background-color: #78b5cd;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #78b5cd;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(120, 181, 205, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(120, 181, 205, 0.45);
Border & gradient
Gradient panel
border: 3px solid #78b5cd;
background: linear-gradient(135deg, #78b5cd, #787CCD);
Gradient text

Gradient headline

background: linear-gradient(90deg, #78b5cd, #8978CD);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #78b5cd;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #78b5cd;
caret-color: #78b5cd;
Left rule
Pull quote or callout
border-left: 4px solid #78b5cd;
Ring + tint
Selected chip
background: #ECF5F8;
box-shadow: inset 0 0 0 2px #78b5cd;
Conic badge
68%
background: conic-gradient(#78b5cd 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #78b5cd 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(120, 181, 205, 0.5)
rgb(120 181 205 / 50%)
#78b5cd80
hsl(197 46% 64% / 50%)
color-mix(in srgb, #78b5cd 50%, transparent)
Alpha8-digit hexFlat on white
10%#78b5cd1a#F2F8FA
20%#78b5cd33#E4F0F5
40%#78b5cd66#C9E1EB
60%#78b5cd99#AED3E1
80%#78b5cdcc#93C4D7

Gradients from #78b5cd

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, #A5CDDD, #78b5cd 45%, #224D5D);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #78b5cd, #6562C5);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #78b5cd, #CD9078);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #BBDAE6 0%, #78b5cd 45%, #224D5D 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4F9FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #9DDBC8 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #8E98D5 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #224D5D 0%, transparent 65%), #78b5cd;

Monochromatic scale

Palettes built from #78b5cd

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.

#78b5cd 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

Converts to four-color process without much drama. Proof it anyway.

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 9.29:1.

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.

#78b5cd, answered

What color is #78b5cd?

#78b5cd is a balanced vivid cyan, closest to Sky Blue (ΔE2000 6.6). It sits at 197° on the hue wheel with 46% saturation and 64% lightness, which reads as cool.

What is the RGB value of #78b5cd?

rgb(120, 181, 205) — 120 red, 181 green and 205 blue out of 255, or 47.1% / 71% / 80.4% by channel.

What is #78b5cd in HSL and HSV?

hsl(197, 46%, 64%) and hsv(197, 41%, 80%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #78b5cd a light or a dark color?

It is a mid-tone. Relative luminance is 0.4145 and perceived brightness is 66%, so black text on it reaches 9.29:1.

Should I use black or white text on #78b5cd?

Black. It scores 9.29:1 against #78b5cd, versus 2.26:1 for white — AAA at any size.

Is #78b5cd accessible on a white background?

#78b5cd on white scores 2.26:1, which fails WCAG AA at every size. Darken it to #387D97 to reach 4.5:1, or #2A5E72 for 7:1.

What is the complementary color of #78b5cd?

#CD9078 sits directly opposite on the wheel. Softer options are the split-complements #CD788B and #CDBA78, which give the same contrast with far less vibration.

What colors go well with #78b5cd?

For interface work: #F4F9FA as the surface, #C3DEE9 for borders, #4B849B for secondary text, #D17774 as an accent and #224D5D for hover and pressed states. For a palette, the analogous pair #78CDBA and #788BCD stays calm, while #CD9078 is the loudest partner.

What is #78b5cd in CMYK for printing?

cmyk(42%, 12%, 0%, 20%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #78b5cd warm or cool?

Cool — it scores 95 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #78CDC6; nudged cooler, #76A7CF.

Which Tailwind color is closest to #78b5cd?

The cyan family — its 500 step is #06b6d4, ΔE2000 7.6 away. That is a visible difference, so define #78b5cd as a custom token rather than reaching for the built-in.

How do I use #78b5cd in Tailwind CSS?

Inline it as an arbitrary value with bg-[#78b5cd] or text-[#78b5cd], 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 #78b5cd with 50% opacity?

rgba(120, 181, 205, 0.5), or #78b5cd80 in eight-digit hex. Over white that composites to #BCDAE6; over black, #3C5B67.

Is #78b5cd a web-safe color?

No. The nearest web-safe colour is #66CCCC, ΔE2000 12.7 away. The palette only matters for legacy displays and some email clients now.

What does the color #78b5cd 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 #78b5cd?

The safest is same-hue elevation: linear-gradient(135deg, #A5CDDD, #78b5cd 45%, #224D5D). For more colour, a short hue run to #6562C5 keeps it rich without turning muddy.

Work with #78b5cd in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #78b5cd at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.