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cyan · cool

#39af89

a balanced, vivid cyan · cool · closest name: Medium Sea Green

Token name suggestion: Studio Teal

RGB
57, 175, 137
HSL
161°, 51%, 46%
CMYK
67, 0, 22, 31
Luminance
0.3334

#39af89 is a balanced vivid cyan, 161° on the wheel and 79/100 on the cool side. Put black text on it (7.67:1). As text it scores 2.74:1 on white — use #2B8568 instead. Nearest name is Medium Sea Green, nearest Tailwind family is emerald.

hsl(161 51% 46%)rgb(57 175 137)Base step 600AAA inkCool

At a glance

Every number on this page in one read: what #39af89 is made of, how bright it looks, and which way it leans.

Hex
#39af89
Hue
161°
cyan
Saturation
51%
vivid
Lightness
46%
balanced
Brightness
69%
HSV value
Perceived
57%
weighted brightness
Luminance
0.3334
WCAG relative
Temperature
Cool
79/100 cool
Color family
Cyan
Tone
Vivid
Best ink
Black
7.67:1
Closest name
Medium Sea Green
ΔE2000 6.8
Chroma
43.1
LCH, 0–130ish
OKLCH L
0.678
perceptual lightness
Tailwind
emerald
500 · ΔE 4.8
Web-safe
#339999
nearest of 216
Where it sits
Hue161° of 360°
Saturation51%
Lightness46%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #39af89.

Temperature
Warm ← → Cool79% 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%
Green92%
Blue5%

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

Every format

HEX#39af89
HEX (8-digit)#39af89ff
RGBrgb(57, 175, 137)
RGBArgba(57, 175, 137, 1)
HSLhsl(161, 51%, 46%)
HSV / HSBhsv(161, 67%, 69%)
HWBhwb(161 22% 31%)
CMYKcmyk(67%, 0%, 22%, 31%)
LABlab(64.4 -41.9 10.1)
LCHlch(64.4 43.1 166.5)
OKLCHoklch(0.678 0.119 167.5)
XYZ (D65)xyz(21.53, 33.33, 28.96)
Decimal3780489
Display P3color(display-p3 0.224 0.686 0.537)
Web-safe#339999

Copy-ready code

every platformclick to select
/* CSS */
color: #39af89;
background-color: #39af89;
/* CSS custom property */
--brand: #39af89;
/* Tailwind (arbitrary) */
class="text-[#39af89] bg-[#39af89]"
/* SCSS */
$brand: #39af89;
/* SwiftUI */
Color(red: 0.224, green: 0.686, blue: 0.537)
/* UIKit */
UIColor(red: 0.224, green: 0.686, blue: 0.537, alpha: 1)
/* Android XML */
<color name="brand">#39AF89</color>
/* Android Compose */
Color(0xFF39AF89)
/* Flutter */
Color(0xFF39AF89)
/* Python / OpenCV (BGR) */
(137, 175, 57)
/* Python / PIL (RGB) */
(57, 175, 137)
/* Java AWT */
new Color(57, 175, 137)
/* .NET */
Color.FromArgb(255, 57, 175, 137)
/* OpenGL / Unity (0–1) */
(0.2235f, 0.6863f, 0.5373f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{57,175,137}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #39af89 85%, white);
border-color: color-mix(in oklab, #39af89 40%, transparent);
/* theme-aware in one line */
color: light-dark(#1F604B, #D3EEE5);
/* relative colour syntax */
--hover: hsl(from #39af89 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: #F4FAF8;
  --brand-100: #EAF6F2;
  --brand-200: #CFEDE3;
  --brand-300: #AAE3D1;
  --brand-400: #80D6BA;
  --brand-500: #56C8A3;
  --brand-600: #39af89;
  --brand-700: #329A79;
  --brand-800: #287B60;
  --brand-900: #215A47;
  --brand-950: #14382D;
  --brand: #39af89;
  --brand-ink: #000000;
  --brand-surface: #F4FAF8;
  --brand-border: #C1EBDE;
  --brand-hover: #309474;
  --brand-pressed: #27795F;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #14241F;
    --brand-ink: #D3EEE5;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F4FAF8',
        100: '#EAF6F2',
        200: '#CFEDE3',
        300: '#AAE3D1',
        400: '#80D6BA',
        500: '#56C8A3',
        600: '#39af89',
        700: '#329A79',
        800: '#287B60',
        900: '#215A47',
        950: '#14382D',
        DEFAULT: '#39af89',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F4FAF8,
  '100': #EAF6F2,
  '200': #CFEDE3,
  '300': #AAE3D1,
  '400': #80D6BA,
  '500': #56C8A3,
  '600': #39af89,
  '700': #329A79,
  '800': #287B60,
  '900': #215A47,
  '950': #14382D,
);
$brand-base: #39af89;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F4FAF8", "$type": "color" },
      "100": { "$value": "#EAF6F2", "$type": "color" },
      "200": { "$value": "#CFEDE3", "$type": "color" },
      "300": { "$value": "#AAE3D1", "$type": "color" },
      "400": { "$value": "#80D6BA", "$type": "color" },
      "500": { "$value": "#56C8A3", "$type": "color" },
      "600": { "$value": "#39af89", "$type": "color" },
      "700": { "$value": "#329A79", "$type": "color" },
      "800": { "$value": "#287B60", "$type": "color" },
      "900": { "$value": "#215A47", "$type": "color" },
      "950": { "$value": "#14382D", "$type": "color" }
    },
    "brandInk": { "$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 #39af89 · 7.67:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 2.74:1
AA fail · AA large fail · AAA fail
Aa
Black text · 7.67:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #39af89 as text scores 2.74:1 on white and 7.67:1 on black.
Best tinted ink on it, if plain black or white feels flat: #1F604B at 2.71:1.

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
#2B8568 · 4.51:1
AA on white−11% L
#2B8568
The quick fox
#20624D · 7.20:1
AAA on white−20% L
#20624D
The quick fox
#39af89 · 7.67:1
AA on blackalready passes
#39af89
The quick fox
#39af89 · 7.67:1
AAA on blackalready passes
#39af89

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #35A480 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
#39af89 on white: 2.74:1
AA ✗ fail · AA-large · AAA
Aa
#39af89 on black: 7.67:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #39af89 as text on that neutral, and that neutral as text on #39af89.

NeutralRatioBoth directions
White2.74:1AaAa
Slate 502.62:1AaAa
Slate 1002.50:1AaAa
Slate 2002.22:1AaAa
Slate 3001.84:1AaAa
Slate 4001.07:1AaAa
Slate 5001.74:1AaAa
Slate 6002.77:1AaAa
Slate 7003.78:1AaAa
Slate 8005.34:1AaAa
Slate 9006.52:1AaAa
Black7.67:1AaAa
Colour vision deficiency
true color
protanopia · #ABA387
deuteranopia · #9B978C
tritanopia · #00B0A4

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. #39af89 is pinned to step 600; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F4FAF8
#EAF6F2
#CFEDE3
#AAE3D1
#80D6BA
#56C8A3
#39af89
#329A79
#287B60
#215A47
#14382D
Base = 600Lightest = 50 · #F4FAF8Darkest = 950 · #14382DText 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 0.030 167.5);
  --brand-100: oklch(0.94 0.048 167.5);
  --brand-200: oklch(0.88 0.072 167.5);
  --brand-300: oklch(0.80 0.093 167.5);
  --brand-400: oklch(0.72 0.110 167.5);
  --brand-500: oklch(0.64 0.119 167.5);
  --brand-600: oklch(0.56 0.119 167.5);
  --brand-700: oklch(0.48 0.112 167.5);
  --brand-800: oklch(0.40 0.100 167.5);
  --brand-900: oklch(0.32 0.083 167.5);
  --brand-950: oklch(0.24 0.066 167.5);
}

Colors that work with #39af89

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#F4FAF8
Tinted page background
Border#C1EBDE
Hairlines and dividers
Muted text#4B9B81
Captions on the surface
Accent#B4347D
Second voice, not a rival
Dark variant#1F604B
Hover, pressed, headers
Light variant#ECF9F5
Selected rows, tints
Dark surface#14241F
Dark-mode background
Hover#309474
One step down in lightness
Pressed#27795F
Two steps down
Disabled#9ABEB3
Chroma pulled out
Focus ring#31CB9A
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 #39af89

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 #1F604B
Safe as a 1px border on white
No — use #35A480

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
  • Weight55/100
  • 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#AF395F
Analogous left#39AF4E
Analogous right#399AAF
Split-complement 1#AF399A
Split-complement 2#AF4E39
Triadic 1#8939AF
Triadic 2#AF8939
Tetradic#4E39AF
On the wheel
Base+30°−30°+120°+240°+180°161°

#39af89 sits at 161°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red22.4%
Green68.6%
Blue53.7%
R · 0–255
57
0x39
G · 0–255
175
0xaf
B · 0–255
137
0x89

CMYK percentages

Cyan67.4%
Magenta0.0%
Yellow21.7%
Key (black)31.4%

Total ink coverage is 121%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#39af89 text on a black background

contrast 7.67:1

Card sample

#39af89 text on a white background

contrast 2.74:1

Card sample

#39af89 on grey

2.50:1

#39af89 on its own surface

2.59:1

#39af89 on its dark surface

5.89:1

CSS3 live lab

Text font color

The quick brown fox

color: #39af89;
Background color
Panel with #39af89 background
background-color: #39af89;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #39af89;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(57, 175, 137, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(57, 175, 137, 0.45);
Border & gradient
Gradient panel
border: 3px solid #39af89;
background: linear-gradient(135deg, #39af89, #3986AF);
Gradient text

Gradient headline

background: linear-gradient(90deg, #39af89, #3969AF);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #39af89;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #39af89;
caret-color: #39af89;
Left rule
Pull quote or callout
border-left: 4px solid #39af89;
Ring + tint
Selected chip
background: #ECF9F5;
box-shadow: inset 0 0 0 2px #39af89;
Conic badge
68%
background: conic-gradient(#39af89 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #39af89 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(57, 175, 137, 0.5)
rgb(57 175 137 / 50%)
#39af8980
hsl(161 51% 46% / 50%)
color-mix(in srgb, #39af89 50%, transparent)
Alpha8-digit hexFlat on white
10%#39af891a#EBF7F3
20%#39af8933#D7EFE7
40%#39af8966#B0DFD0
60%#39af8999#88CFB8
80%#39af89cc#61BFA1

Gradients from #39af89

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, #5BCAA6, #39af89 45%, #1F604B);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #39af89, #316C98);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #39af89, #AF395F);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #73D1B3 0%, #39af89 45%, #1F604B 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4FAF8, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #54C75F 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #44A1C2 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #1F604B 0%, transparent 65%), #39af89;

Monochromatic scale

Palettes built from #39af89

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.

#39af89 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 7.67:1.

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.

#39af89, answered

What color is #39af89?

#39af89 is a balanced vivid cyan, closest to Medium Sea Green (ΔE2000 6.8). It sits at 161° on the hue wheel with 51% saturation and 46% lightness, which reads as cool.

What is the RGB value of #39af89?

rgb(57, 175, 137) — 57 red, 175 green and 137 blue out of 255, or 22.4% / 68.6% / 53.7% by channel.

What is #39af89 in HSL and HSV?

hsl(161, 51%, 46%) and hsv(161, 67%, 69%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #39af89 a light or a dark color?

It is a mid-tone. Relative luminance is 0.3334 and perceived brightness is 57%, so black text on it reaches 7.67:1.

Should I use black or white text on #39af89?

Black. It scores 7.67:1 against #39af89, versus 2.74:1 for white — AAA at any size.

Is #39af89 accessible on a white background?

#39af89 on white scores 2.74:1, which fails WCAG AA at every size. Darken it to #2B8568 to reach 4.5:1, or #20624D for 7:1.

What is the complementary color of #39af89?

#AF395F sits directly opposite on the wheel. Softer options are the split-complements #AF399A and #AF4E39, which give the same contrast with far less vibration.

What colors go well with #39af89?

For interface work: #F4FAF8 as the surface, #C1EBDE for borders, #4B9B81 for secondary text, #B4347D as an accent and #1F604B for hover and pressed states. For a palette, the analogous pair #39AF4E and #399AAF stays calm, while #AF395F is the loudest partner.

What is #39af89 in CMYK for printing?

cmyk(67%, 0%, 22%, 31%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #39af89 warm or cool?

Cool — it scores 79 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #39AF5E; nudged cooler, #37ACB1.

Which Tailwind color is closest to #39af89?

The emerald family — its 500 step is #10b981, ΔE2000 4.8 away. That is a visible difference, so define #39af89 as a custom token rather than reaching for the built-in.

How do I use #39af89 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#39af89] or text-[#39af89], 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 #39af89 with 50% opacity?

rgba(57, 175, 137, 0.5), or #39af8980 in eight-digit hex. Over white that composites to #9CD7C4; over black, #1D5845.

Is #39af89 a web-safe color?

No. The nearest web-safe colour is #339999, ΔE2000 14.4 away. The palette only matters for legacy displays and some email clients now.

What does the color #39af89 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 #39af89?

The safest is same-hue elevation: linear-gradient(135deg, #5BCAA6, #39af89 45%, #1F604B). For more colour, a short hue run to #316C98 keeps it rich without turning muddy.

Work with #39af89 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #39af89 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.