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cyan · cool

#115d5f

a deep, vivid cyan · cool · closest name: Dark Slate Gray

Token name suggestion: Ink Glacier

RGB
17, 93, 95
HSL
182°, 70%, 22%
CMYK
82, 2, 0, 63
Luminance
0.0877

#115d5f is a deep vivid cyan, 182° on the wheel and 88/100 on the cool side. Put white text on it (7.62:1). As text it scores 7.62:1 on white — safe at any size. Nearest name is Dark Slate Gray, nearest Tailwind family is slate.

hsl(182 70% 22%)rgb(17 93 95)Base step 900AAA inkCool

At a glance

Every number on this page in one read: what #115d5f is made of, how bright it looks, and which way it leans.

Hex
#115d5f
Hue
182°
cyan
Saturation
70%
vivid
Lightness
22%
deep
Brightness
37%
HSV value
Perceived
31%
weighted brightness
Luminance
0.0877
WCAG relative
Temperature
Cool
88/100 cool
Color family
Cyan
Tone
Vivid
Best ink
White
7.62:1
Closest name
Dark Slate Gray
ΔE2000 7.3
Chroma
22.1
LCH, 0–130ish
OKLCH L
0.436
perceptual lightness
Tailwind
slate
500 · ΔE 21.3
Web-safe
#006666
nearest of 216
Where it sits
Hue182° of 360°
Saturation70%
Lightness22%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #115d5f.

Temperature
Warm ← → Cool88% 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
Red1%
Green89%
Blue9%

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

Every format

HEX#115d5f
HEX (8-digit)#115d5fff
RGBrgb(17, 93, 95)
RGBArgba(17, 93, 95, 1)
HSLhsl(182, 70%, 22%)
HSV / HSBhsv(182, 82%, 37%)
HWBhwb(182 7% 63%)
CMYKcmyk(82%, 2%, 0%, 63%)
LABlab(35.5 -20.8 -7.5)
LCHlch(35.5 22.1 199.9)
OKLCHoklch(0.436 0.069 197.7)
XYZ (D65)xyz(6.21, 8.77, 12.19)
Decimal1138015
Display P3color(display-p3 0.067 0.365 0.373)
Web-safe#006666

Copy-ready code

every platformclick to select
/* CSS */
color: #115d5f;
background-color: #115d5f;
/* CSS custom property */
--brand: #115d5f;
/* Tailwind (arbitrary) */
class="text-[#115d5f] bg-[#115d5f]"
/* SCSS */
$brand: #115d5f;
/* SwiftUI */
Color(red: 0.067, green: 0.365, blue: 0.373)
/* UIKit */
UIColor(red: 0.067, green: 0.365, blue: 0.373, alpha: 1)
/* Android XML */
<color name="brand">#115D5F</color>
/* Android Compose */
Color(0xFF115D5F)
/* Flutter */
Color(0xFF115D5F)
/* Python / OpenCV (BGR) */
(95, 93, 17)
/* Python / PIL (RGB) */
(17, 93, 95)
/* Java AWT */
new Color(17, 93, 95)
/* .NET */
Color.FromArgb(255, 17, 93, 95)
/* OpenGL / Unity (0–1) */
(0.0667f, 0.3647f, 0.3725f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{17,93,95}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #115d5f 85%, white);
border-color: color-mix(in oklab, #115d5f 40%, transparent);
/* theme-aware in one line */
color: light-dark(#136A6C, #D3EDEE);
/* relative colour syntax */
--hover: hsl(from #115d5f 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: #F3FBFC;
  --brand-100: #E7F8F8;
  --brand-200: #CAF1F2;
  --brand-300: #A0ECEE;
  --brand-400: #70E2E5;
  --brand-500: #41D9DD;
  --brand-600: #25CBD0;
  --brand-700: #1FA9AD;
  --brand-800: #19888A;
  --brand-900: #115d5f;
  --brand-950: #0E3E3F;
  --brand: #115d5f;
  --brand-ink: #ffffff;
  --brand-surface: #F4FAFA;
  --brand-border: #C0ECED;
  --brand-hover: #0C4041;
  --brand-pressed: #062223;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #142424;
    --brand-ink: #D3EDEE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F3FBFC',
        100: '#E7F8F8',
        200: '#CAF1F2',
        300: '#A0ECEE',
        400: '#70E2E5',
        500: '#41D9DD',
        600: '#25CBD0',
        700: '#1FA9AD',
        800: '#19888A',
        900: '#115d5f',
        950: '#0E3E3F',
        DEFAULT: '#115d5f',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F3FBFC,
  '100': #E7F8F8,
  '200': #CAF1F2,
  '300': #A0ECEE,
  '400': #70E2E5,
  '500': #41D9DD,
  '600': #25CBD0,
  '700': #1FA9AD,
  '800': #19888A,
  '900': #115d5f,
  '950': #0E3E3F,
);
$brand-base: #115d5f;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F3FBFC", "$type": "color" },
      "100": { "$value": "#E7F8F8", "$type": "color" },
      "200": { "$value": "#CAF1F2", "$type": "color" },
      "300": { "$value": "#A0ECEE", "$type": "color" },
      "400": { "$value": "#70E2E5", "$type": "color" },
      "500": { "$value": "#41D9DD", "$type": "color" },
      "600": { "$value": "#25CBD0", "$type": "color" },
      "700": { "$value": "#1FA9AD", "$type": "color" },
      "800": { "$value": "#19888A", "$type": "color" },
      "900": { "$value": "#115d5f", "$type": "color" },
      "950": { "$value": "#0E3E3F", "$type": "color" }
    },
    "brandInk": { "$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 #115d5f · 7.62:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 7.62:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 2.75:1
AA fail · AA large fail · AAA fail
Reading the other direction: #115d5f as text scores 7.62:1 on white and 2.75:1 on black.
Best tinted ink on it, if plain black or white feels flat: #E9FBFB at 7.14:1.

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
#115d5f · 7.62:1
AA on whitealready passes
#115d5f
The quick fox
#115d5f · 7.62:1
AAA on whitealready passes
#115d5f
The quick fox
#188386 · 4.63:1
AA on black+9% L
#188386
The quick fox
#1EA5A9 · 7.01:1
AAA on black+17% L
#1EA5A9

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #115D5F 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
#115d5f on white: 7.62:1
AA ✓ pass · AA-large · AAA
Aa
#115d5f on black: 2.75:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #115d5f as text on that neutral, and that neutral as text on #115d5f.

NeutralRatioBoth directions
White7.62:1AaAa
Slate 507.29:1AaAa
Slate 1006.96:1AaAa
Slate 2006.18:1AaAa
Slate 3005.13:1AaAa
Slate 4002.97:1AaAa
Slate 5001.60:1AaAa
Slate 6001.01:1AaAa
Slate 7001.36:1AaAa
Slate 8001.92:1AaAa
Slate 9002.34:1AaAa
Black2.75:1AaAa
Colour vision deficiency
true color
protanopia · #56585F
deuteranopia · #4B505F
tritanopia · #00615D

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. #115d5f is pinned to step 900; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F3FBFC
#E7F8F8
#CAF1F2
#A0ECEE
#70E2E5
#41D9DD
#25CBD0
#1FA9AD
#19888A
#115d5f
#0E3E3F
Base = 900Lightest = 50 · #F3FBFCDarkest = 950 · #0E3E3FText step on white = 900
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 0.017 197.7);
  --brand-100: oklch(0.94 0.028 197.7);
  --brand-200: oklch(0.88 0.041 197.7);
  --brand-300: oklch(0.80 0.054 197.7);
  --brand-400: oklch(0.72 0.063 197.7);
  --brand-500: oklch(0.64 0.069 197.7);
  --brand-600: oklch(0.56 0.069 197.7);
  --brand-700: oklch(0.48 0.065 197.7);
  --brand-800: oklch(0.40 0.058 197.7);
  --brand-900: oklch(0.32 0.048 197.7);
  --brand-950: oklch(0.24 0.038 197.7);
}

Colors that work with #115d5f

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#F4FAFA
Tinted page background
Border#C0ECED
Hairlines and dividers
Muted text#4B999B
Captions on the surface
Accent#610F21
Second voice, not a rival
Dark variant#136A6C
Hover, pressed, headers
Light variant#E9FBFB
Selected rows, tints
Dark surface#142424
Dark-mode background
Hover#0C4041
One step down in lightness
Pressed#062223
Two steps down
Disabled#588889
Chroma pulled out
Focus ring#0E7477
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 #115d5f

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

Works well for
  • Body text and links on white
  • 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
  • Text on black or near-black surfaces
  • 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
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.

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
  • Weight78/100
  • 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#5F1311
Analogous left#115F3A
Analogous right#11365F
Split-complement 1#5F1136
Split-complement 2#5F3A11
Triadic 1#5F115D
Triadic 2#5D5F11
Tetradic#3A115F
On the wheel
Base+30°−30°+120°+240°+180°182°

#115d5f sits at 182°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red6.7%
Green36.5%
Blue37.3%
R · 0–255
17
0x11
G · 0–255
93
0x5d
B · 0–255
95
0x5f

CMYK percentages

Cyan82.1%
Magenta2.1%
Yellow0.0%
Key (black)62.7%

Total ink coverage is 147%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#115d5f text on a black background

contrast 2.75:1

Card sample

#115d5f text on a white background

contrast 7.62:1

Card sample

#115d5f on grey

6.96:1

#115d5f on its own surface

7.22:1

#115d5f on its dark surface

2.11:1

CSS3 live lab

Text font color

The quick brown fox

color: #115d5f;
Background color
Panel with #115d5f background
background-color: #115d5f;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #115d5f;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(17, 93, 95, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(17, 93, 95, 0.45);
Border & gradient
Gradient panel
border: 3px solid #115d5f;
background: linear-gradient(135deg, #115d5f, #11295F);
Gradient text

Gradient headline

background: linear-gradient(90deg, #115d5f, #11165F);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #115d5f;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #115d5f;
caret-color: #115d5f;
Left rule
Pull quote or callout
border-left: 4px solid #115d5f;
Ring + tint
Selected chip
background: #E9FBFB;
box-shadow: inset 0 0 0 2px #115d5f;
Conic badge
68%
background: conic-gradient(#115d5f 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #115d5f 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(17, 93, 95, 0.5)
rgb(17 93 95 / 50%)
#115d5f80
hsl(182 70% 22% / 50%)
color-mix(in srgb, #115d5f 50%, transparent)
Alpha8-digit hexFlat on white
10%#115d5f1a#E7EFEF
20%#115d5f33#CFDFDF
40%#115d5f66#A0BEBF
60%#115d5f99#709E9F
80%#115d5fcc#417D7F

Gradients from #115d5f

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, #1A9093, #115d5f 45%, #136A6C);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #115d5f, #0C1945);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #115d5f, #5F1311);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #1FA9AD 0%, #115d5f 45%, #136A6C 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%, #198A4B 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #163D79 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #136A6C 0%, transparent 65%), #115d5f;

Monochromatic scale

Palettes built from #115d5f

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.

#115d5f 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 2.75:1 — lift it to #188386 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.

#115d5f, answered

What color is #115d5f?

#115d5f is a deep vivid cyan, closest to Dark Slate Gray (ΔE2000 7.3). It sits at 182° on the hue wheel with 70% saturation and 22% lightness, which reads as cool.

What is the RGB value of #115d5f?

rgb(17, 93, 95) — 17 red, 93 green and 95 blue out of 255, or 6.7% / 36.5% / 37.3% by channel.

What is #115d5f in HSL and HSV?

hsl(182, 70%, 22%) and hsv(182, 82%, 37%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #115d5f a light or a dark color?

It is a dark color. Relative luminance is 0.0877 and perceived brightness is 31%, so white text on it reaches 7.62:1.

Should I use black or white text on #115d5f?

White. It scores 7.62:1 against #115d5f, versus 2.75:1 for black — AAA at any size.

Is #115d5f accessible on a white background?

#115d5f on white scores 7.62:1, which clears AAA at every size.

What is the complementary color of #115d5f?

#5F1311 sits directly opposite on the wheel. Softer options are the split-complements #5F1136 and #5F3A11, which give the same contrast with far less vibration.

What colors go well with #115d5f?

For interface work: #F4FAFA as the surface, #C0ECED for borders, #4B999B for secondary text, #610F21 as an accent and #136A6C for hover and pressed states. For a palette, the analogous pair #115F3A and #11365F stays calm, while #5F1311 is the loudest partner.

What is #115d5f in CMYK for printing?

cmyk(82%, 2%, 0%, 63%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #115d5f warm or cool?

Cool — it scores 88 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #115F44; nudged cooler, #104160.

Which Tailwind color is closest to #115d5f?

The slate family — its 500 step is #64748b, ΔE2000 21.3 away. That is a visible difference, so define #115d5f as a custom token rather than reaching for the built-in.

How do I use #115d5f in Tailwind CSS?

Inline it as an arbitrary value with bg-[#115d5f] or text-[#115d5f], 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 #115d5f with 50% opacity?

rgba(17, 93, 95, 0.5), or #115d5f80 in eight-digit hex. Over white that composites to #88AEAF; over black, #092F30.

Is #115d5f a web-safe color?

No. The nearest web-safe colour is #006666, ΔE2000 3.4 away. The palette only matters for legacy displays and some email clients now.

What does the color #115d5f 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 #115d5f?

The safest is same-hue elevation: linear-gradient(135deg, #1A9093, #115d5f 45%, #136A6C). For more colour, a short hue run to #0C1945 keeps it rich without turning muddy.

Work with #115d5f in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #115d5f at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.