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cyan · cool

#39655f

a dark, soft cyan · cool · closest name: Dark Slate Gray

Token name suggestion: Slate Glacier

RGB
57, 101, 95
HSL
172°, 28%, 31%
CMYK
44, 0, 6, 60
Luminance
0.1100

#39655f is a dark soft cyan, 172° on the wheel and 77/100 on the cool side. Put white text on it (6.56:1). As text it scores 6.56:1 on white — safe at any size. Nearest name is Dark Slate Gray, nearest Tailwind family is neutral.

hsl(172 28% 31%)rgb(57 101 95)Base step 800AA inkCool

At a glance

Every number on this page in one read: what #39655f is made of, how bright it looks, and which way it leans.

Hex
#39655f
Hue
172°
cyan
Saturation
28%
soft
Lightness
31%
dark
Brightness
40%
HSV value
Perceived
35%
weighted brightness
Luminance
0.1100
WCAG relative
Temperature
Cool
77/100 cool
Color family
Cyan
Tone
Soft
Best ink
White
6.56:1
Closest name
Dark Slate Gray
ΔE2000 8.2
Chroma
16.9
LCH, 0–130ish
OKLCH L
0.473
perceptual lightness
Tailwind
neutral
500 · ΔE 18
Web-safe
#336666
nearest of 216
Where it sits
Hue172° of 360°
Saturation28%
Lightness31%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #39655f.

Temperature
Warm ← → Cool77% 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
Red8%
Green85%
Blue8%

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

Every format

HEX#39655f
HEX (8-digit)#39655fff
RGBrgb(57, 101, 95)
RGBArgba(57, 101, 95, 1)
HSLhsl(172, 28%, 31%)
HSV / HSBhsv(172, 44%, 40%)
HWBhwb(172 22% 60%)
CMYKcmyk(44%, 0%, 6%, 60%)
LABlab(39.6 -16.8 -1.4)
LCHlch(39.6 16.9 184.7)
OKLCHoklch(0.473 0.050 184.6)
XYZ (D65)xyz(8.41, 11.00, 12.51)
Decimal3761503
Display P3color(display-p3 0.224 0.396 0.373)
Web-safe#336666

Copy-ready code

every platformclick to select
/* CSS */
color: #39655f;
background-color: #39655f;
/* CSS custom property */
--brand: #39655f;
/* Tailwind (arbitrary) */
class="text-[#39655f] bg-[#39655f]"
/* SCSS */
$brand: #39655f;
/* SwiftUI */
Color(red: 0.224, green: 0.396, blue: 0.373)
/* UIKit */
UIColor(red: 0.224, green: 0.396, blue: 0.373, alpha: 1)
/* Android XML */
<color name="brand">#39655F</color>
/* Android Compose */
Color(0xFF39655F)
/* Flutter */
Color(0xFF39655F)
/* Python / OpenCV (BGR) */
(95, 101, 57)
/* Python / PIL (RGB) */
(57, 101, 95)
/* Java AWT */
new Color(57, 101, 95)
/* .NET */
Color.FromArgb(255, 57, 101, 95)
/* OpenGL / Unity (0–1) */
(0.2235f, 0.3961f, 0.3725f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{57,101,95}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #39655f 85%, white);
border-color: color-mix(in oklab, #39655f 40%, transparent);
/* theme-aware in one line */
color: light-dark(#2E514D, #D8E9E7);
/* relative colour syntax */
--hover: hsl(from #39655f 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: #F6F9F9;
  --brand-100: #ECF3F2;
  --brand-200: #D6E6E4;
  --brand-300: #B7D6D2;
  --brand-400: #93C2BC;
  --brand-500: #70AEA5;
  --brand-600: #589C93;
  --brand-700: #4A827B;
  --brand-800: #39655f;
  --brand-900: #2E4D49;
  --brand-950: #1C302D;
  --brand: #39655f;
  --brand-ink: #ffffff;
  --brand-surface: #F5F9F9;
  --brand-border: #CBE2DE;
  --brand-hover: #2C4E4A;
  --brand-pressed: #1F3734;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142422;
    --brand-ink: #D8E9E7;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F6F9F9',
        100: '#ECF3F2',
        200: '#D6E6E4',
        300: '#B7D6D2',
        400: '#93C2BC',
        500: '#70AEA5',
        600: '#589C93',
        700: '#4A827B',
        800: '#39655f',
        900: '#2E4D49',
        950: '#1C302D',
        DEFAULT: '#39655f',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F6F9F9,
  '100': #ECF3F2,
  '200': #D6E6E4,
  '300': #B7D6D2,
  '400': #93C2BC,
  '500': #70AEA5,
  '600': #589C93,
  '700': #4A827B,
  '800': #39655f,
  '900': #2E4D49,
  '950': #1C302D,
);
$brand-base: #39655f;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F6F9F9", "$type": "color" },
      "100": { "$value": "#ECF3F2", "$type": "color" },
      "200": { "$value": "#D6E6E4", "$type": "color" },
      "300": { "$value": "#B7D6D2", "$type": "color" },
      "400": { "$value": "#93C2BC", "$type": "color" },
      "500": { "$value": "#70AEA5", "$type": "color" },
      "600": { "$value": "#589C93", "$type": "color" },
      "700": { "$value": "#4A827B", "$type": "color" },
      "800": { "$value": "#39655f", "$type": "color" },
      "900": { "$value": "#2E4D49", "$type": "color" },
      "950": { "$value": "#1C302D", "$type": "color" }
    },
    "brandInk": { "$value": "#ffffff", "$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#ffffff on #39655f · 6.56:1
Use #ffffffAA at every size, AAA for large text only.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 6.56:1 · recommended
AA pass · AA large pass · AAA fail
Aa
Black text · 3.20:1
AA fail · AA large pass · AAA fail
Reading the other direction: #39655f as text scores 6.56:1 on white and 3.20:1 on black.
Best tinted ink on it, if plain black or white feels flat: #EFF6F5 at 5.99:1.

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
#39655f · 6.56:1
AA on whitealready passes
#39655f
The quick fox
#355F59 · 7.16:1
AAA on white−2% L
#355F59
The quick fox
#487F78 · 4.58:1
AA on black+8% L
#487F78
The quick fox
#5CA399 · 7.15:1
AAA on black+19% L
#5CA399

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #39655F 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
#39655f on white: 6.56:1
AA ✓ pass · AA-large · AAA
Aa
#39655f on black: 3.20:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #39655f as text on that neutral, and that neutral as text on #39655f.

NeutralRatioBoth directions
White6.56:1AaAa
Slate 506.27:1AaAa
Slate 1005.99:1AaAa
Slate 2005.32:1AaAa
Slate 3004.42:1AaAa
Slate 4002.56:1AaAa
Slate 5001.38:1AaAa
Slate 6001.15:1AaAa
Slate 7001.58:1AaAa
Slate 8002.23:1AaAa
Slate 9002.72:1AaAa
Black3.20:1AaAa
Colour vision deficiency
true color
protanopia · #61615F
deuteranopia · #595B60
tritanopia · #286763

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. #39655f is pinned to step 800; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F6F9F9
#ECF3F2
#D6E6E4
#B7D6D2
#93C2BC
#70AEA5
#589C93
#4A827B
#39655f
#2E4D49
#1C302D
Base = 800Lightest = 50 · #F6F9F9Darkest = 950 · #1C302DText 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 0.013 184.6);
  --brand-100: oklch(0.94 0.020 184.6);
  --brand-200: oklch(0.88 0.030 184.6);
  --brand-300: oklch(0.80 0.039 184.6);
  --brand-400: oklch(0.72 0.046 184.6);
  --brand-500: oklch(0.64 0.050 184.6);
  --brand-600: oklch(0.56 0.050 184.6);
  --brand-700: oklch(0.48 0.047 184.6);
  --brand-800: oklch(0.40 0.042 184.6);
  --brand-900: oklch(0.32 0.035 184.6);
  --brand-950: oklch(0.24 0.028 184.6);
}

Colors that work with #39655f

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

Text on it#ffffff
White wins here
Surface#F5F9F9
Tinted page background
Border#CBE2DE
Hairlines and dividers
Muted text#53938A
Captions on the surface
Accent#683649
Second voice, not a rival
Dark variant#2E514D
Hover, pressed, headers
Light variant#EFF6F5
Selected rows, tints
Dark surface#142422
Dark-mode background
Hover#2C4E4A
One step down in lightness
Pressed#1F3734
Two steps down
Disabled#6DA29A
Chroma pulled out
Focus ring#387B72
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 #39655f

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

Works well for
  • Body text and links on white
  • Charts, tags and secondary surfaces
  • Headers, footers and dark-mode surfaces
  • Brand accents, badges and data highlights
Use with care
  • 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
Any size
Safe as a fill behind white type
Yes
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.

The muted chroma softens the association — it reads considered rather than loud, which suits long-form and data-heavy screens. 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
  • Weight69/100
  • 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#65393F
Analogous left#396549
Analogous right#395565
Split-complement 1#653955
Split-complement 2#654939
Triadic 1#5F3965
Triadic 2#655F39
Tetradic#493965
On the wheel
Base+30°−30°+120°+240°+180°172°

#39655f sits at 172°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red22.4%
Green39.6%
Blue37.3%
R · 0–255
57
0x39
G · 0–255
101
0x65
B · 0–255
95
0x5f

CMYK percentages

Cyan43.6%
Magenta0.0%
Yellow5.9%
Key (black)60.4%

Total ink coverage is 110%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#39655f text on a black background

contrast 3.20:1

Card sample

#39655f text on a white background

contrast 6.56:1

Card sample

#39655f on grey

5.99:1

#39655f on its own surface

6.19:1

#39655f on its dark surface

2.45:1

CSS3 live lab

Text font color

The quick brown fox

color: #39655f;
Background color
Panel with #39655f background
background-color: #39655f;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #39655f;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(57, 101, 95, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(57, 101, 95, 0.45);
Border & gradient
Gradient panel
border: 3px solid #39655f;
background: linear-gradient(135deg, #39655f, #394E65);
Gradient text

Gradient headline

background: linear-gradient(90deg, #39655f, #394365);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #39655f;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #39655f;
caret-color: #39655f;
Left rule
Pull quote or callout
border-left: 4px solid #39655f;
Ring + tint
Selected chip
background: #EFF6F5;
box-shadow: inset 0 0 0 2px #39655f;
Conic badge
68%
background: conic-gradient(#39655f 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #39655f 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, 101, 95, 0.5)
rgb(57 101 95 / 50%)
#39655f80
hsl(172 28% 31% / 50%)
color-mix(in srgb, #39655f 50%, transparent)
Alpha8-digit hexFlat on white
10%#39655f1a#EBF0EF
20%#39655f33#D7E0DF
40%#39655f66#B0C1BF
60%#39655f99#88A39F
80%#39655fcc#61847F

Gradients from #39655f

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, #4F8C84, #39655f 45%, #2E514D);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #39655f, #2E3C51);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #39655f, #65393F);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #5AA096 0%, #39655f 45%, #2E514D 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F5F9F9, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #4B865C 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #446179 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #2E514D 0%, transparent 65%), #39655f;

Monochromatic scale

Palettes built from #39655f

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.

#39655f 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

Too dim on dark surfaces at 3.20:1 — lift it to #487F78 for body text, or reserve it for fills.

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.

#39655f, answered

What color is #39655f?

#39655f is a dark soft cyan, closest to Dark Slate Gray (ΔE2000 8.2). It sits at 172° on the hue wheel with 28% saturation and 31% lightness, which reads as cool.

What is the RGB value of #39655f?

rgb(57, 101, 95) — 57 red, 101 green and 95 blue out of 255, or 22.4% / 39.6% / 37.3% by channel.

What is #39655f in HSL and HSV?

hsl(172, 28%, 31%) and hsv(172, 44%, 40%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #39655f a light or a dark color?

It is a dark color. Relative luminance is 0.1100 and perceived brightness is 35%, so white text on it reaches 6.56:1.

Should I use black or white text on #39655f?

White. It scores 6.56:1 against #39655f, versus 3.20:1 for black — AA at any size.

Is #39655f accessible on a white background?

#39655f on white scores 6.56:1, which clears AA at every size but not AAA.

What is the complementary color of #39655f?

#65393F sits directly opposite on the wheel. Softer options are the split-complements #653955 and #654939, which give the same contrast with far less vibration.

What colors go well with #39655f?

For interface work: #F5F9F9 as the surface, #CBE2DE for borders, #53938A for secondary text, #683649 as an accent and #2E514D for hover and pressed states. For a palette, the analogous pair #396549 and #395565 stays calm, while #65393F is the loudest partner.

What is #39655f in CMYK for printing?

cmyk(44%, 0%, 6%, 60%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #39655f warm or cool?

Cool — it scores 77 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #39654F; nudged cooler, #375C67.

Which Tailwind color is closest to #39655f?

The neutral family — its 500 step is #737373, ΔE2000 18 away. That is a visible difference, so define #39655f as a custom token rather than reaching for the built-in.

How do I use #39655f in Tailwind CSS?

Inline it as an arbitrary value with bg-[#39655f] or text-[#39655f], 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 #39655f with 50% opacity?

rgba(57, 101, 95, 0.5), or #39655f80 in eight-digit hex. Over white that composites to #9CB2AF; over black, #1D3330.

Is #39655f a web-safe color?

No. The nearest web-safe colour is #336666, ΔE2000 2.9 away. The palette only matters for legacy displays and some email clients now.

What does the color #39655f 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 #39655f?

The safest is same-hue elevation: linear-gradient(135deg, #4F8C84, #39655f 45%, #2E514D). For more colour, a short hue run to #2E3C51 keeps it rich without turning muddy.

Work with #39655f in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #39655f at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.