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cyan · cool

#369b83

a dark, vivid cyan · cool · closest name: Light Sea Green

Token name suggestion: Slate Teal

RGB
54, 155, 131
HSL
166°, 48%, 41%
CMYK
65, 0, 16, 39
Luminance
0.2587

#369b83 is a dark vivid cyan, 166° on the wheel and 82/100 on the cool side. Put black text on it (6.17:1). As text it scores 3.40:1 on white — large text only. Nearest name is Light Sea Green, nearest Tailwind family is teal.

hsl(166 48% 41%)rgb(54 155 131)Base step 700AA inkCool

At a glance

Every number on this page in one read: what #369b83 is made of, how bright it looks, and which way it leans.

Hex
#369b83
Hue
166°
cyan
Saturation
48%
vivid
Lightness
41%
dark
Brightness
61%
HSV value
Perceived
51%
weighted brightness
Luminance
0.2587
WCAG relative
Temperature
Cool
82/100 cool
Color family
Cyan
Tone
Vivid
Best ink
Black
6.17:1
Closest name
Light Sea Green
ΔE2000 9.6
Chroma
35.2
LCH, 0–130ish
OKLCH L
0.625
perceptual lightness
Tailwind
teal
500 · ΔE 9.3
Web-safe
#339999
nearest of 216
Where it sits
Hue166° of 360°
Saturation48%
Lightness41%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #369b83.

Temperature
Warm ← → Cool82% 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
Red3%
Green91%
Blue6%

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

Every format

HEX#369b83
HEX (8-digit)#369b83ff
RGBrgb(54, 155, 131)
RGBArgba(54, 155, 131, 1)
HSLhsl(166, 48%, 41%)
HSV / HSBhsv(166, 65%, 61%)
HWBhwb(166 21% 39%)
CMYKcmyk(65%, 0%, 16%, 39%)
LABlab(57.9 -35.0 4.1)
LCHlch(57.9 35.2 173.4)
OKLCHoklch(0.625 0.100 174.1)
XYZ (D65)xyz(17.34, 25.86, 25.55)
Decimal3578755
Display P3color(display-p3 0.212 0.608 0.514)
Web-safe#339999

Copy-ready code

every platformclick to select
/* CSS */
color: #369b83;
background-color: #369b83;
/* CSS custom property */
--brand: #369b83;
/* Tailwind (arbitrary) */
class="text-[#369b83] bg-[#369b83]"
/* SCSS */
$brand: #369b83;
/* SwiftUI */
Color(red: 0.212, green: 0.608, blue: 0.514)
/* UIKit */
UIColor(red: 0.212, green: 0.608, blue: 0.514, alpha: 1)
/* Android XML */
<color name="brand">#369B83</color>
/* Android Compose */
Color(0xFF369B83)
/* Flutter */
Color(0xFF369B83)
/* Python / OpenCV (BGR) */
(131, 155, 54)
/* Python / PIL (RGB) */
(54, 155, 131)
/* Java AWT */
new Color(54, 155, 131)
/* .NET */
Color.FromArgb(255, 54, 155, 131)
/* OpenGL / Unity (0–1) */
(0.2118f, 0.6078f, 0.5137f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{54,155,131}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #369b83 85%, white);
border-color: color-mix(in oklab, #369b83 40%, transparent);
/* theme-aware in one line */
color: light-dark(#215F50, #D3EEE8);
/* relative colour syntax */
--hover: hsl(from #369b83 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: #F4FAF9;
  --brand-100: #EAF5F3;
  --brand-200: #D0ECE5;
  --brand-300: #ACE2D5;
  --brand-400: #82D3C0;
  --brand-500: #59C5AB;
  --brand-600: #3FB699;
  --brand-700: #369b83;
  --brand-800: #2A7966;
  --brand-900: #22584B;
  --brand-950: #15372F;
  --brand: #369b83;
  --brand-ink: #000000;
  --brand-surface: #F4FAF9;
  --brand-border: #C2EAE1;
  --brand-hover: #2D816D;
  --brand-pressed: #246656;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142420;
    --brand-ink: #D3EEE8;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F4FAF9',
        100: '#EAF5F3',
        200: '#D0ECE5',
        300: '#ACE2D5',
        400: '#82D3C0',
        500: '#59C5AB',
        600: '#3FB699',
        700: '#369b83',
        800: '#2A7966',
        900: '#22584B',
        950: '#15372F',
        DEFAULT: '#369b83',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F4FAF9,
  '100': #EAF5F3,
  '200': #D0ECE5,
  '300': #ACE2D5,
  '400': #82D3C0,
  '500': #59C5AB,
  '600': #3FB699,
  '700': #369b83,
  '800': #2A7966,
  '900': #22584B,
  '950': #15372F,
);
$brand-base: #369b83;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F4FAF9", "$type": "color" },
      "100": { "$value": "#EAF5F3", "$type": "color" },
      "200": { "$value": "#D0ECE5", "$type": "color" },
      "300": { "$value": "#ACE2D5", "$type": "color" },
      "400": { "$value": "#82D3C0", "$type": "color" },
      "500": { "$value": "#59C5AB", "$type": "color" },
      "600": { "$value": "#3FB699", "$type": "color" },
      "700": { "$value": "#369b83", "$type": "color" },
      "800": { "$value": "#2A7966", "$type": "color" },
      "900": { "$value": "#22584B", "$type": "color" },
      "950": { "$value": "#15372F", "$type": "color" }
    },
    "brandInk": { "$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 #369b83 · 6.17:1
Use #000000AA at every size, AAA for large text only.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 3.40:1
AA fail · AA large pass · AAA fail
Aa
Black text · 6.17:1 · recommended
AA pass · AA large pass · AAA fail
Reading the other direction: #369b83 as text scores 3.40:1 on white and 6.17:1 on black.
Best tinted ink on it, if plain black or white feels flat: #215F50 at 2.19:1.

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
#2E8470 · 4.52:1
AA on white−6% L
#2E8470
The quick fox
#226253 · 7.14:1
AAA on white−15% L
#226253
The quick fox
#369b83 · 6.17:1
AA on blackalready passes
#369b83
The quick fox
#3AA68D · 7.02:1
AAA on black+3% L
#3AA68D

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #369B83 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
#369b83 on white: 3.40:1
AA ✗ fail · AA-large · AAA
Aa
#369b83 on black: 6.17:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #369b83 as text on that neutral, and that neutral as text on #369b83.

NeutralRatioBoth directions
White3.40:1AaAa
Slate 503.25:1AaAa
Slate 1003.11:1AaAa
Slate 2002.76:1AaAa
Slate 3002.29:1AaAa
Slate 4001.33:1AaAa
Slate 5001.40:1AaAa
Slate 6002.23:1AaAa
Slate 7003.04:1AaAa
Slate 8004.30:1AaAa
Slate 9005.25:1AaAa
Black6.17:1AaAa
Colour vision deficiency
true color
protanopia · #969182
deuteranopia · #878785
tritanopia · #009D94

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. #369b83 is pinned to step 700; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F4FAF9
#EAF5F3
#D0ECE5
#ACE2D5
#82D3C0
#59C5AB
#3FB699
#369b83
#2A7966
#22584B
#15372F
Base = 700Lightest = 50 · #F4FAF9Darkest = 950 · #15372FText 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 0.025 174.1);
  --brand-100: oklch(0.94 0.040 174.1);
  --brand-200: oklch(0.88 0.060 174.1);
  --brand-300: oklch(0.80 0.078 174.1);
  --brand-400: oklch(0.72 0.092 174.1);
  --brand-500: oklch(0.64 0.100 174.1);
  --brand-600: oklch(0.56 0.100 174.1);
  --brand-700: oklch(0.48 0.094 174.1);
  --brand-800: oklch(0.40 0.084 174.1);
  --brand-900: oklch(0.32 0.070 174.1);
  --brand-950: oklch(0.24 0.055 174.1);
}

Colors that work with #369b83

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#F4FAF9
Tinted page background
Border#C2EAE1
Hairlines and dividers
Muted text#4B9B88
Captions on the surface
Accent#9F3267
Second voice, not a rival
Dark variant#215F50
Hover, pressed, headers
Light variant#ECF8F5
Selected rows, tints
Dark surface#142420
Dark-mode background
Hover#2D816D
One step down in lightness
Pressed#246656
Two steps down
Disabled#8CB5AC
Chroma pulled out
Focus ring#30B696
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 #369b83

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

Works well for
  • Headings from 24px up on white
  • Text and icons on dark surfaces
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Headers, footers and dark-mode surfaces
  • Brand accents, badges and data highlights
Use with care
  • Small text on white — under 4.5:1
  • Full-page backgrounds — tiring over long sessions
  • Black text placed on it
  • Thin strokes and 1px borders — they disappear on light UI
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
24px / 18.66px bold
Safe as a fill behind white type
No — use #215F50
Safe as a 1px border on white
Yes

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 low lightness adds weight and formality.

Worth knowing

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

Reads as
  • FormalityHigh
  • EnergyMedium-high
  • Weight59/100
  • 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#9B364E
Analogous left#369B50
Analogous right#36819B
Split-complement 1#9B3681
Split-complement 2#9B5036
Triadic 1#83369B
Triadic 2#9B8336
Tetradic#50369B
On the wheel
Base+30°−30°+120°+240°+180°166°

#369b83 sits at 166°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red21.2%
Green60.8%
Blue51.4%
R · 0–255
54
0x36
G · 0–255
155
0x9b
B · 0–255
131
0x83

CMYK percentages

Cyan65.2%
Magenta0.0%
Yellow15.5%
Key (black)39.2%

Total ink coverage is 120%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#369b83 text on a black background

contrast 6.17:1

Card sample

#369b83 text on a white background

contrast 3.40:1

Card sample

#369b83 on grey

3.11:1

#369b83 on its own surface

3.22:1

#369b83 on its dark surface

4.74:1

CSS3 live lab

Text font color

The quick brown fox

color: #369b83;
Background color
Panel with #369b83 background
background-color: #369b83;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #369b83;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(54, 155, 131, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(54, 155, 131, 0.45);
Border & gradient
Gradient panel
border: 3px solid #369b83;
background: linear-gradient(135deg, #369b83, #36709B);
Gradient text

Gradient headline

background: linear-gradient(90deg, #369b83, #36579B);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #369b83;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #369b83;
caret-color: #369b83;
Left rule
Pull quote or callout
border-left: 4px solid #369b83;
Ring + tint
Selected chip
background: #ECF8F5;
box-shadow: inset 0 0 0 2px #369b83;
Conic badge
68%
background: conic-gradient(#369b83 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #369b83 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(54, 155, 131, 0.5)
rgb(54 155 131 / 50%)
#369b8380
hsl(166 48% 41% / 50%)
color-mix(in srgb, #369b83 50%, transparent)
Alpha8-digit hexFlat on white
10%#369b831a#EBF5F3
20%#369b8333#D7EBE6
40%#369b8366#AFD7CD
60%#369b8399#86C3B5
80%#369b83cc#5EAF9C

Gradients from #369b83

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, #4DC1A5, #369b83 45%, #215F50);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #369b83, #2E5884);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #369b83, #9B364E);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #64C9B1 0%, #369b83 45%, #215F50 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4FAF9, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #46BE5B 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #3E8AB2 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #215F50 0%, transparent 65%), #369b83;

Monochromatic scale

Palettes built from #369b83

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.

#369b83 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 6.17:1.

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.

#369b83, answered

What color is #369b83?

#369b83 is a dark vivid cyan, closest to Light Sea Green (ΔE2000 9.6). It sits at 166° on the hue wheel with 48% saturation and 41% lightness, which reads as cool.

What is the RGB value of #369b83?

rgb(54, 155, 131) — 54 red, 155 green and 131 blue out of 255, or 21.2% / 60.8% / 51.4% by channel.

What is #369b83 in HSL and HSV?

hsl(166, 48%, 41%) and hsv(166, 65%, 61%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #369b83 a light or a dark color?

It is a mid-tone. Relative luminance is 0.2587 and perceived brightness is 51%, so black text on it reaches 6.17:1.

Should I use black or white text on #369b83?

Black. It scores 6.17:1 against #369b83, versus 3.40:1 for white — AA at any size.

Is #369b83 accessible on a white background?

#369b83 on white scores 3.40:1, which only clears AA for large text — 18.66px bold or 24px regular and up. Darken it to #2E8470 to reach 4.5:1, or #226253 for 7:1.

What is the complementary color of #369b83?

#9B364E sits directly opposite on the wheel. Softer options are the split-complements #9B3681 and #9B5036, which give the same contrast with far less vibration.

What colors go well with #369b83?

For interface work: #F4FAF9 as the surface, #C2EAE1 for borders, #4B9B88 for secondary text, #9F3267 as an accent and #215F50 for hover and pressed states. For a palette, the analogous pair #369B50 and #36819B stays calm, while #9B364E is the loudest partner.

What is #369b83 in CMYK for printing?

cmyk(65%, 0%, 16%, 39%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #369b83 warm or cool?

Cool — it scores 82 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #369B5E; nudged cooler, #34909D.

Which Tailwind color is closest to #369b83?

The teal family — its 500 step is #14b8a6, ΔE2000 9.3 away. That is a visible difference, so define #369b83 as a custom token rather than reaching for the built-in.

How do I use #369b83 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#369b83] or text-[#369b83], 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 #369b83 with 50% opacity?

rgba(54, 155, 131, 0.5), or #369b8380 in eight-digit hex. Over white that composites to #9BCDC1; over black, #1B4E42.

Is #369b83 a web-safe color?

No. The nearest web-safe colour is #339999, ΔE2000 9.2 away. The palette only matters for legacy displays and some email clients now.

What does the color #369b83 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 #369b83?

The safest is same-hue elevation: linear-gradient(135deg, #4DC1A5, #369b83 45%, #215F50). For more colour, a short hue run to #2E5884 keeps it rich without turning muddy.

Work with #369b83 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #369b83 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.