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blue · cool

#57718d

a dark, soft blue · cool · closest name: Slate Gray

Token name suggestion: Shadow Cobalt

RGB
87, 113, 141
HSL
211°, 24%, 45%
CMYK
38, 20, 0, 45
Luminance
0.1576

#57718d is a dark soft blue, 211° on the wheel and 83/100 on the cool side. Put white text on it (5.06:1). As text it scores 5.06:1 on white — safe at any size. Nearest name is Slate Gray, nearest Tailwind family is slate.

hsl(211 24% 45%)rgb(87 113 141)Base step 600AA inkCool

At a glance

Every number on this page in one read: what #57718d is made of, how bright it looks, and which way it leans.

Hex
#57718d
Hue
211°
blue
Saturation
24%
soft
Lightness
45%
dark
Brightness
55%
HSV value
Perceived
43%
weighted brightness
Luminance
0.1576
WCAG relative
Temperature
Cool
83/100 cool
Color family
Blue
Tone
Soft
Best ink
White
5.06:1
Closest name
Slate Gray
ΔE2000 7.7
Chroma
18.4
LCH, 0–130ish
OKLCH L
0.539
perceptual lightness
Tailwind
slate
500 · ΔE 3.5
Web-safe
#666699
nearest of 216
Where it sits
Hue211° of 360°
Saturation24%
Lightness45%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #57718d.

Temperature
Warm ← → Cool83% 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
Red13%
Green75%
Blue12%

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

Every format

HEX#57718d
HEX (8-digit)#57718dff
RGBrgb(87, 113, 141)
RGBArgba(87, 113, 141, 1)
HSLhsl(211, 24%, 45%)
HSV / HSBhsv(211, 38%, 55%)
HWBhwb(211 34% 45%)
CMYKcmyk(38%, 20%, 0%, 45%)
LABlab(46.7 -2.0 -18.3)
LCHlch(46.7 18.4 263.7)
OKLCHoklch(0.539 0.054 250.7)
XYZ (D65)xyz(14.64, 15.76, 27.46)
Decimal5730701
Display P3color(display-p3 0.341 0.443 0.553)
Web-safe#666699

Copy-ready code

every platformclick to select
/* CSS */
color: #57718d;
background-color: #57718d;
/* CSS custom property */
--brand: #57718d;
/* Tailwind (arbitrary) */
class="text-[#57718d] bg-[#57718d]"
/* SCSS */
$brand: #57718d;
/* SwiftUI */
Color(red: 0.341, green: 0.443, blue: 0.553)
/* UIKit */
UIColor(red: 0.341, green: 0.443, blue: 0.553, alpha: 1)
/* Android XML */
<color name="brand">#57718D</color>
/* Android Compose */
Color(0xFF57718D)
/* Flutter */
Color(0xFF57718D)
/* Python / OpenCV (BGR) */
(141, 113, 87)
/* Python / PIL (RGB) */
(87, 113, 141)
/* Java AWT */
new Color(87, 113, 141)
/* .NET */
Color.FromArgb(255, 87, 113, 141)
/* OpenGL / Unity (0–1) */
(0.3412f, 0.4431f, 0.5529f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{87,113,141}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #57718d 85%, white);
border-color: color-mix(in oklab, #57718d 40%, transparent);
/* theme-aware in one line */
color: light-dark(#313F4F, #D9E0E8);
/* relative colour syntax */
--hover: hsl(from #57718d 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: #F6F7F9;
  --brand-100: #EDF0F3;
  --brand-200: #D7DEE5;
  --brand-300: #BAC6D4;
  --brand-400: #97AABF;
  --brand-500: #748EA9;
  --brand-600: #57718d;
  --brand-700: #4E657E;
  --brand-800: #3E5165;
  --brand-900: #303D4B;
  --brand-950: #1E262F;
  --brand: #57718d;
  --brand-ink: #ffffff;
  --brand-surface: #F6F7F9;
  --brand-border: #CDD6E0;
  --brand-hover: #495F77;
  --brand-pressed: #3C4E61;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #151C23;
    --brand-ink: #D9E0E8;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F6F7F9',
        100: '#EDF0F3',
        200: '#D7DEE5',
        300: '#BAC6D4',
        400: '#97AABF',
        500: '#748EA9',
        600: '#57718d',
        700: '#4E657E',
        800: '#3E5165',
        900: '#303D4B',
        950: '#1E262F',
        DEFAULT: '#57718d',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F6F7F9,
  '100': #EDF0F3,
  '200': #D7DEE5,
  '300': #BAC6D4,
  '400': #97AABF,
  '500': #748EA9,
  '600': #57718d,
  '700': #4E657E,
  '800': #3E5165,
  '900': #303D4B,
  '950': #1E262F,
);
$brand-base: #57718d;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F6F7F9", "$type": "color" },
      "100": { "$value": "#EDF0F3", "$type": "color" },
      "200": { "$value": "#D7DEE5", "$type": "color" },
      "300": { "$value": "#BAC6D4", "$type": "color" },
      "400": { "$value": "#97AABF", "$type": "color" },
      "500": { "$value": "#748EA9", "$type": "color" },
      "600": { "$value": "#57718d", "$type": "color" },
      "700": { "$value": "#4E657E", "$type": "color" },
      "800": { "$value": "#3E5165", "$type": "color" },
      "900": { "$value": "#303D4B", "$type": "color" },
      "950": { "$value": "#1E262F", "$type": "color" }
    },
    "brandInk": { "$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 #57718d · 5.06:1
Use #ffffffAA at every size, AAA for large text only.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 5.06:1 · recommended
AA pass · AA large pass · AAA fail
Aa
Black text · 4.15:1
AA fail · AA large pass · AAA fail
Reading the other direction: #57718d as text scores 5.06:1 on white and 4.15:1 on black.
Best tinted ink on it, if plain black or white feels flat: #EFF2F5 at 4.50:1.

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
#57718d · 5.06:1
AA on whitealready passes
#57718d
The quick fox
#455A71 · 7.11:1
AAA on white−9% L
#455A71
The quick fox
#5D7996 · 4.64:1
AA on black+3% L
#5D7996
The quick fox
#839AB3 · 7.24:1
AAA on black+16% L
#839AB3

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #57718D 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
#57718d on white: 5.06:1
AA ✓ pass · AA-large · AAA
Aa
#57718d on black: 4.15:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #57718d as text on that neutral, and that neutral as text on #57718d.

NeutralRatioBoth directions
White5.06:1AaAa
Slate 504.83:1AaAa
Slate 1004.62:1AaAa
Slate 2004.10:1AaAa
Slate 3003.41:1AaAa
Slate 4001.97:1AaAa
Slate 5001.06:1AaAa
Slate 6001.50:1AaAa
Slate 7002.05:1AaAa
Slate 8002.89:1AaAa
Slate 9003.53:1AaAa
Black4.15:1AaAa
Colour vision deficiency
true color
protanopia · #66728E
deuteranopia · #606C8C
tritanopia · #45777A

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. #57718d 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.

#F6F7F9
#EDF0F3
#D7DEE5
#BAC6D4
#97AABF
#748EA9
#57718d
#4E657E
#3E5165
#303D4B
#1E262F
Base = 600Lightest = 50 · #F6F7F9Darkest = 950 · #1E262FText step on white = 600
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 0.013 250.7);
  --brand-100: oklch(0.94 0.021 250.7);
  --brand-200: oklch(0.88 0.032 250.7);
  --brand-300: oklch(0.80 0.042 250.7);
  --brand-400: oklch(0.72 0.049 250.7);
  --brand-500: oklch(0.64 0.054 250.7);
  --brand-600: oklch(0.56 0.054 250.7);
  --brand-700: oklch(0.48 0.050 250.7);
  --brand-800: oklch(0.40 0.045 250.7);
  --brand-900: oklch(0.32 0.038 250.7);
  --brand-950: oklch(0.24 0.030 250.7);
}

Colors that work with #57718d

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#F6F7F9
Tinted page background
Border#CDD6E0
Hairlines and dividers
Muted text#58728E
Captions on the surface
Accent#926352
Second voice, not a rival
Dark variant#313F4F
Hover, pressed, headers
Light variant#EFF2F5
Selected rows, tints
Dark surface#151C23
Dark-mode background
Hover#495F77
One step down in lightness
Pressed#3C4E61
Two steps down
Disabled#97A9BD
Chroma pulled out
Focus ring#527BA6
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 #57718d

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
  • 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.

trustedcalmcompetentcorporate

The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed.

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

It is also the most crowded hue on the web. Distinctiveness has to come from your other choices.

Reads as
  • FormalityHigh
  • EnergyMedium
  • 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#8D7357
Analogous left#578C8D
Analogous right#58578D
Split-complement 1#8D5857
Split-complement 2#8C8D57
Triadic 1#8D5771
Triadic 2#718D57
Tetradic#8D578C
On the wheel
Base+30°−30°+120°+240°+180°211°

#57718d sits at 211°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red34.1%
Green44.3%
Blue55.3%
R · 0–255
87
0x57
G · 0–255
113
0x71
B · 0–255
141
0x8d

CMYK percentages

Cyan38.3%
Magenta19.9%
Yellow0.0%
Key (black)44.7%

Total ink coverage is 103%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#57718d text on a black background

contrast 4.15:1

Card sample

#57718d text on a white background

contrast 5.06:1

Card sample

#57718d on grey

4.62:1

#57718d on its own surface

4.72:1

#57718d on its dark surface

3.40:1

CSS3 live lab

Text font color

The quick brown fox

color: #57718d;
Background color
Panel with #57718d background
background-color: #57718d;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #57718d;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(87, 113, 141, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(87, 113, 141, 0.45);
Border & gradient
Gradient panel
border: 3px solid #57718d;
background: linear-gradient(135deg, #57718d, #61578D);
Gradient text

Gradient headline

background: linear-gradient(90deg, #57718d, #6E578D);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #57718d;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #57718d;
caret-color: #57718d;
Left rule
Pull quote or callout
border-left: 4px solid #57718d;
Ring + tint
Selected chip
background: #EFF2F5;
box-shadow: inset 0 0 0 2px #57718d;
Conic badge
68%
background: conic-gradient(#57718d 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #57718d 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(87, 113, 141, 0.5)
rgb(87 113 141 / 50%)
#57718d80
hsl(211 24% 45% / 50%)
color-mix(in srgb, #57718d 50%, transparent)
Alpha8-digit hexFlat on white
10%#57718d1a#EEF1F4
20%#57718d33#DDE3E8
40%#57718d66#BCC6D1
60%#57718d99#9AAABB
80%#57718dcc#798DA4

Gradients from #57718d

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, #7690AB, #57718d 45%, #313F4F);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #57718d, #584B7A);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #57718d, #8D7357);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #899FB6 0%, #57718d 45%, #313F4F 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F6F7F9, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #70A7A3 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #6A639F 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #313F4F 0%, transparent 65%), #57718d;

Monochromatic scale

Palettes built from #57718d

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.

#57718d in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Industries
TechnologyFinanceHealthcareEnterprise SaaS
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 4.15:1 — lift it to #5D7996 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.

#57718d, answered

What color is #57718d?

#57718d is a dark soft blue, closest to Slate Gray (ΔE2000 7.7). It sits at 211° on the hue wheel with 24% saturation and 45% lightness, which reads as cool.

What is the RGB value of #57718d?

rgb(87, 113, 141) — 87 red, 113 green and 141 blue out of 255, or 34.1% / 44.3% / 55.3% by channel.

What is #57718d in HSL and HSV?

hsl(211, 24%, 45%) and hsv(211, 38%, 55%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #57718d a light or a dark color?

It is a dark color. Relative luminance is 0.1576 and perceived brightness is 43%, so white text on it reaches 5.06:1.

Should I use black or white text on #57718d?

White. It scores 5.06:1 against #57718d, versus 4.15:1 for black — AA at any size.

Is #57718d accessible on a white background?

#57718d on white scores 5.06:1, which clears AA at every size but not AAA.

What is the complementary color of #57718d?

#8D7357 sits directly opposite on the wheel. Softer options are the split-complements #8D5857 and #8C8D57, which give the same contrast with far less vibration.

What colors go well with #57718d?

For interface work: #F6F7F9 as the surface, #CDD6E0 for borders, #58728E for secondary text, #926352 as an accent and #313F4F for hover and pressed states. For a palette, the analogous pair #578C8D and #58578D stays calm, while #8D7357 is the loudest partner.

What is #57718d in CMYK for printing?

cmyk(38%, 20%, 0%, 45%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #57718d warm or cool?

Cool — it scores 83 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #575D8D; nudged cooler, #4B647F.

Which Tailwind color is closest to #57718d?

The slate family — its 500 step is #64748b, ΔE2000 3.5 away. That is a visible difference, so define #57718d as a custom token rather than reaching for the built-in.

How do I use #57718d in Tailwind CSS?

Inline it as an arbitrary value with bg-[#57718d] or text-[#57718d], 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 #57718d with 50% opacity?

rgba(87, 113, 141, 0.5), or #57718d80 in eight-digit hex. Over white that composites to #ABB8C6; over black, #2C3947.

Is #57718d a web-safe color?

No. The nearest web-safe colour is #666699, ΔE2000 10.1 away. The palette only matters for legacy displays and some email clients now.

What does the color #57718d mean?

As a blue, it reads trusted, calm, competent. The default of institutions for a reason: blue is read as stable and safe across nearly every culture that has been surveyed. At this moderate chroma the association is present but not shouted.

What gradient works with #57718d?

The safest is same-hue elevation: linear-gradient(135deg, #7690AB, #57718d 45%, #313F4F). For more colour, a short hue run to #584B7A keeps it rich without turning muddy.

Work with #57718d in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #57718d at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.