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cyan · cool

#5abcb9

a balanced, soft cyan · cool · closest name: Light Sea Green

Token name suggestion: Studio Lagoon

RGB
90, 188, 185
HSL
178°, 42%, 55%
CMYK
52, 0, 2, 26
Luminance
0.4164

#5abcb9 is a balanced soft cyan, 178° on the wheel and 87/100 on the cool side. Put black text on it (9.33:1). As text it scores 2.25:1 on white — use #34817E instead. Nearest name is Light Sea Green, nearest Tailwind family is teal.

hsl(178 42% 55%)rgb(90 188 185)Base step 500AAA inkCool

At a glance

Every number on this page in one read: what #5abcb9 is made of, how bright it looks, and which way it leans.

Hex
#5abcb9
Hue
178°
cyan
Saturation
42%
soft
Lightness
55%
balanced
Brightness
74%
HSV value
Perceived
65%
weighted brightness
Luminance
0.4164
WCAG relative
Temperature
Cool
87/100 cool
Color family
Cyan
Tone
Soft
Best ink
Black
9.33:1
Closest name
Light Sea Green
ΔE2000 5.2
Chroma
30.3
LCH, 0–130ish
OKLCH L
0.736
perceptual lightness
Tailwind
teal
500 · ΔE 7.1
Web-safe
#66CCCC
nearest of 216
Where it sits
Hue178° of 360°
Saturation42%
Lightness55%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #5abcb9.

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
Red5%
Green86%
Blue8%

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

Every format

HEX#5abcb9
HEX (8-digit)#5abcb9ff
RGBrgb(90, 188, 185)
RGBArgba(90, 188, 185, 1)
HSLhsl(178, 42%, 55%)
HSV / HSBhsv(178, 52%, 74%)
HWBhwb(178 35% 26%)
CMYKcmyk(52%, 0%, 2%, 26%)
LABlab(70.6 -29.4 -7.3)
LCHlch(70.6 30.3 193.9)
OKLCHoklch(0.736 0.092 192.7)
XYZ (D65)xyz(30.95, 41.64, 52.30)
Decimal5946553
Display P3color(display-p3 0.353 0.737 0.725)
Web-safe#66CCCC

Copy-ready code

every platformclick to select
/* CSS */
color: #5abcb9;
background-color: #5abcb9;
/* CSS custom property */
--brand: #5abcb9;
/* Tailwind (arbitrary) */
class="text-[#5abcb9] bg-[#5abcb9]"
/* SCSS */
$brand: #5abcb9;
/* SwiftUI */
Color(red: 0.353, green: 0.737, blue: 0.725)
/* UIKit */
UIColor(red: 0.353, green: 0.737, blue: 0.725, alpha: 1)
/* Android XML */
<color name="brand">#5ABCB9</color>
/* Android Compose */
Color(0xFF5ABCB9)
/* Flutter */
Color(0xFF5ABCB9)
/* Python / OpenCV (BGR) */
(185, 188, 90)
/* Python / PIL (RGB) */
(90, 188, 185)
/* Java AWT */
new Color(90, 188, 185)
/* .NET */
Color.FromArgb(255, 90, 188, 185)
/* OpenGL / Unity (0–1) */
(0.3529f, 0.7373f, 0.7255f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{90,188,185}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #5abcb9 85%, white);
border-color: color-mix(in oklab, #5abcb9 40%, transparent);
/* theme-aware in one line */
color: light-dark(#255B59, #D3EDED);
/* relative colour syntax */
--hover: hsl(from #5abcb9 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: #F5FAFA;
  --brand-100: #EBF5F4;
  --brand-200: #D2EAE9;
  --brand-300: #AFDFDD;
  --brand-400: #87CECC;
  --brand-500: #5abcb9;
  --brand-600: #47AEAB;
  --brand-700: #3B918E;
  --brand-800: #2F7472;
  --brand-900: #255554;
  --brand-950: #173534;
  --brand: #5abcb9;
  --brand-ink: #000000;
  --brand-surface: #F4FAFA;
  --brand-border: #C5E7E6;
  --brand-hover: #46ACA9;
  --brand-pressed: #3C9390;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142424;
    --brand-ink: #D3EDED;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F5FAFA',
        100: '#EBF5F4',
        200: '#D2EAE9',
        300: '#AFDFDD',
        400: '#87CECC',
        500: '#5abcb9',
        600: '#47AEAB',
        700: '#3B918E',
        800: '#2F7472',
        900: '#255554',
        950: '#173534',
        DEFAULT: '#5abcb9',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F5FAFA,
  '100': #EBF5F4,
  '200': #D2EAE9,
  '300': #AFDFDD,
  '400': #87CECC,
  '500': #5abcb9,
  '600': #47AEAB,
  '700': #3B918E,
  '800': #2F7472,
  '900': #255554,
  '950': #173534,
);
$brand-base: #5abcb9;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F5FAFA", "$type": "color" },
      "100": { "$value": "#EBF5F4", "$type": "color" },
      "200": { "$value": "#D2EAE9", "$type": "color" },
      "300": { "$value": "#AFDFDD", "$type": "color" },
      "400": { "$value": "#87CECC", "$type": "color" },
      "500": { "$value": "#5abcb9", "$type": "color" },
      "600": { "$value": "#47AEAB", "$type": "color" },
      "700": { "$value": "#3B918E", "$type": "color" },
      "800": { "$value": "#2F7472", "$type": "color" },
      "900": { "$value": "#255554", "$type": "color" },
      "950": { "$value": "#173534", "$type": "color" }
    },
    "brandInk": { "$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 #5abcb9 · 9.33:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 2.25:1
AA fail · AA large fail · AAA fail
Aa
Black text · 9.33:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #5abcb9 as text scores 2.25:1 on white and 9.33:1 on black.
Best tinted ink on it, if plain black or white feels flat: #255B59 at 3.43:1.

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
#34817E · 4.58:1
AA on white−19% L
#34817E
The quick fox
#27605E · 7.19:1
AAA on white−28% L
#27605E
The quick fox
#5abcb9 · 9.33:1
AA on blackalready passes
#5abcb9
The quick fox
#5abcb9 · 9.33:1
AAA on blackalready passes
#5abcb9

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #42A19E 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
#5abcb9 on white: 2.25:1
AA ✗ fail · AA-large · AAA
Aa
#5abcb9 on black: 9.33:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #5abcb9 as text on that neutral, and that neutral as text on #5abcb9.

NeutralRatioBoth directions
White2.25:1AaAa
Slate 502.15:1AaAa
Slate 1002.05:1AaAa
Slate 2001.83:1AaAa
Slate 3001.52:1AaAa
Slate 4001.14:1AaAa
Slate 5002.11:1AaAa
Slate 6003.37:1AaAa
Slate 7004.60:1AaAa
Slate 8006.50:1AaAa
Slate 9007.93:1AaAa
Black9.33:1AaAa
Colour vision deficiency
true color
protanopia · #B2B4B9
deuteranopia · #A2A8BA
tritanopia · #0AC1BB

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. #5abcb9 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.

#F5FAFA
#EBF5F4
#D2EAE9
#AFDFDD
#87CECC
#5abcb9
#47AEAB
#3B918E
#2F7472
#255554
#173534
Base = 500Lightest = 50 · #F5FAFADarkest = 950 · #173534Text 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 0.023 192.7);
  --brand-100: oklch(0.94 0.037 192.7);
  --brand-200: oklch(0.88 0.055 192.7);
  --brand-300: oklch(0.80 0.072 192.7);
  --brand-400: oklch(0.72 0.085 192.7);
  --brand-500: oklch(0.64 0.092 192.7);
  --brand-600: oklch(0.56 0.092 192.7);
  --brand-700: oklch(0.48 0.087 192.7);
  --brand-800: oklch(0.40 0.077 192.7);
  --brand-900: oklch(0.32 0.065 192.7);
  --brand-950: oklch(0.24 0.051 192.7);
}

Colors that work with #5abcb9

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#C5E7E6
Hairlines and dividers
Muted text#4B9B99
Captions on the surface
Accent#C15573
Second voice, not a rival
Dark variant#255B59
Hover, pressed, headers
Light variant#EDF8F7
Selected rows, tints
Dark surface#142424
Dark-mode background
Hover#46ACA9
One step down in lightness
Pressed#3C9390
Two steps down
Disabled#B6D0CF
Chroma pulled out
Focus ring#5ECCC9
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 #5abcb9

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

Works well for
  • Text and icons on dark surfaces
  • Charts, tags and secondary surfaces
  • Brand accents, badges and data highlights
  • Chart series and data categories
Use with care
  • Text of any size on white — fails WCAG AA
  • 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 #255B59
Safe as a 1px border on white
No — use #42A19E

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.

The muted chroma softens the association — it reads considered rather than loud, which suits long-form and data-heavy screens. 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
  • Weight46/100
  • 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#BC5A5D
Analogous left#5ABC88
Analogous right#5A8EBC
Split-complement 1#BC5A8E
Split-complement 2#BC885A
Triadic 1#B95ABC
Triadic 2#BCB95A
Tetradic#885ABC
On the wheel
Base+30°−30°+120°+240°+180°178°

#5abcb9 sits at 178°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red35.3%
Green73.7%
Blue72.5%
R · 0–255
90
0x5a
G · 0–255
188
0xbc
B · 0–255
185
0xb9

CMYK percentages

Cyan52.1%
Magenta0.0%
Yellow1.6%
Key (black)26.3%

Total ink coverage is 80%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#5abcb9 text on a black background

contrast 9.33:1

Card sample

#5abcb9 text on a white background

contrast 2.25:1

Card sample

#5abcb9 on grey

2.05:1

#5abcb9 on its own surface

2.13:1

#5abcb9 on its dark surface

7.13:1

CSS3 live lab

Text font color

The quick brown fox

color: #5abcb9;
Background color
Panel with #5abcb9 background
background-color: #5abcb9;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #5abcb9;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(90, 188, 185, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(90, 188, 185, 0.45);
Border & gradient
Gradient panel
border: 3px solid #5abcb9;
background: linear-gradient(135deg, #5abcb9, #5A7EBC);
Gradient text

Gradient headline

background: linear-gradient(90deg, #5abcb9, #5A65BC);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #5abcb9;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #5abcb9;
caret-color: #5abcb9;
Left rule
Pull quote or callout
border-left: 4px solid #5abcb9;
Ring + tint
Selected chip
background: #EDF8F7;
box-shadow: inset 0 0 0 2px #5abcb9;
Conic badge
68%
background: conic-gradient(#5abcb9 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #5abcb9 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(90, 188, 185, 0.5)
rgb(90 188 185 / 50%)
#5abcb980
hsl(178 42% 55% / 50%)
color-mix(in srgb, #5abcb9 50%, transparent)
Alpha8-digit hexFlat on white
10%#5abcb91a#EFF8F8
20%#5abcb933#DEF2F1
40%#5abcb966#BDE4E3
60%#5abcb999#9CD7D5
80%#5abcb9cc#7BC9C7

Gradients from #5abcb9

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, #86CECB, #5abcb9 45%, #255B59);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #5abcb9, #4765B0);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #5abcb9, #BC5A5D);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #9BD6D5 0%, #5abcb9 45%, #255B59 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%, #7ECB9C 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #7096C5 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #255B59 0%, transparent 65%), #5abcb9;

Monochromatic scale

Palettes built from #5abcb9

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.

#5abcb9 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 9.33:1.

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.

#5abcb9, answered

What color is #5abcb9?

#5abcb9 is a balanced soft cyan, closest to Light Sea Green (ΔE2000 5.2). It sits at 178° on the hue wheel with 42% saturation and 55% lightness, which reads as cool.

What is the RGB value of #5abcb9?

rgb(90, 188, 185) — 90 red, 188 green and 185 blue out of 255, or 35.3% / 73.7% / 72.5% by channel.

What is #5abcb9 in HSL and HSV?

hsl(178, 42%, 55%) and hsv(178, 52%, 74%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #5abcb9 a light or a dark color?

It is a mid-tone. Relative luminance is 0.4164 and perceived brightness is 65%, so black text on it reaches 9.33:1.

Should I use black or white text on #5abcb9?

Black. It scores 9.33:1 against #5abcb9, versus 2.25:1 for white — AAA at any size.

Is #5abcb9 accessible on a white background?

#5abcb9 on white scores 2.25:1, which fails WCAG AA at every size. Darken it to #34817E to reach 4.5:1, or #27605E for 7:1.

What is the complementary color of #5abcb9?

#BC5A5D sits directly opposite on the wheel. Softer options are the split-complements #BC5A8E and #BC885A, which give the same contrast with far less vibration.

What colors go well with #5abcb9?

For interface work: #F4FAFA as the surface, #C5E7E6 for borders, #4B9B99 for secondary text, #C15573 as an accent and #255B59 for hover and pressed states. For a palette, the analogous pair #5ABC88 and #5A8EBC stays calm, while #BC5A5D is the loudest partner.

What is #5abcb9 in CMYK for printing?

cmyk(52%, 0%, 2%, 26%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #5abcb9 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 #5ABC95; nudged cooler, #589CBE.

Which Tailwind color is closest to #5abcb9?

The teal family — its 500 step is #14b8a6, ΔE2000 7.1 away. That is a visible difference, so define #5abcb9 as a custom token rather than reaching for the built-in.

How do I use #5abcb9 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#5abcb9] or text-[#5abcb9], 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 #5abcb9 with 50% opacity?

rgba(90, 188, 185, 0.5), or #5abcb980 in eight-digit hex. Over white that composites to #ADDEDC; over black, #2D5E5D.

Is #5abcb9 a web-safe color?

No. The nearest web-safe colour is #66CCCC, ΔE2000 4.4 away. The palette only matters for legacy displays and some email clients now.

What does the color #5abcb9 mean?

As a cyan, it reads clean, technical, fresh. Cyan reads as water, air and infrastructure: cool, hygienic, engineered. At this moderate chroma the association is present but not shouted.

What gradient works with #5abcb9?

The safest is same-hue elevation: linear-gradient(135deg, #86CECB, #5abcb9 45%, #255B59). For more colour, a short hue run to #4765B0 keeps it rich without turning muddy.

Work with #5abcb9 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #5abcb9 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.