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blue · cool

#383557

a dark, soft blue · cool · closest name: Dark Slate Blue

Token name suggestion: Slate Cobalt

RGB
56, 53, 87
HSL
245°, 24%, 28%
CMYK
36, 39, 0, 66
Luminance
0.0408

#383557 is a dark soft blue, 245° on the wheel and 71/100 on the cool side. Put white text on it (11.57:1). As text it scores 11.57:1 on white — safe at any size. Nearest name is Dark Slate Blue, nearest Tailwind family is gray.

hsl(245 24% 28%)rgb(56 53 87)Base step 900AAA inkCool

At a glance

Every number on this page in one read: what #383557 is made of, how bright it looks, and which way it leans.

Hex
#383557
Hue
245°
blue
Saturation
24%
soft
Lightness
28%
dark
Brightness
34%
HSV value
Perceived
23%
weighted brightness
Luminance
0.0408
WCAG relative
Temperature
Cool
71/100 cool
Color family
Blue
Tone
Soft
Best ink
White
11.57:1
Closest name
Dark Slate Blue
ΔE2000 11
Chroma
22.6
LCH, 0–130ish
OKLCH L
0.348
perceptual lightness
Tailwind
gray
500 · ΔE 22.7
Web-safe
#333366
nearest of 216
Where it sits
Hue245° of 360°
Saturation24%
Lightness28%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #383557.

Temperature
Warm ← → Cool71% 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
Red21%
Green62%
Blue17%

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

Every format

HEX#383557
HEX (8-digit)#383557ff
RGBrgb(56, 53, 87)
RGBArgba(56, 53, 87, 1)
HSLhsl(245, 24%, 28%)
HSV / HSBhsv(245, 39%, 34%)
HWBhwb(245 21% 66%)
CMYKcmyk(36%, 39%, 0%, 66%)
LABlab(23.9 10.5 -20.1)
LCHlch(23.9 22.6 297.6)
OKLCHoklch(0.348 0.059 287.0)
XYZ (D65)xyz(4.62, 4.07, 9.56)
Decimal3683671
Display P3color(display-p3 0.220 0.208 0.341)
Web-safe#333366

Copy-ready code

every platformclick to select
/* CSS */
color: #383557;
background-color: #383557;
/* CSS custom property */
--brand: #383557;
/* Tailwind (arbitrary) */
class="text-[#383557] bg-[#383557]"
/* SCSS */
$brand: #383557;
/* SwiftUI */
Color(red: 0.220, green: 0.208, blue: 0.341)
/* UIKit */
UIColor(red: 0.220, green: 0.208, blue: 0.341, alpha: 1)
/* Android XML */
<color name="brand">#383557</color>
/* Android Compose */
Color(0xFF383557)
/* Flutter */
Color(0xFF383557)
/* Python / OpenCV (BGR) */
(87, 53, 56)
/* Python / PIL (RGB) */
(56, 53, 87)
/* Java AWT */
new Color(56, 53, 87)
/* .NET */
Color.FromArgb(255, 56, 53, 87)
/* OpenGL / Unity (0–1) */
(0.2196f, 0.2078f, 0.3412f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{56,53,87}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #383557 85%, white);
border-color: color-mix(in oklab, #383557 40%, transparent);
/* theme-aware in one line */
color: light-dark(#33304F, #DAD9E8);
/* relative colour syntax */
--hover: hsl(from #383557 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: #F6F6F9;
  --brand-100: #EDEDF3;
  --brand-200: #D8D7E5;
  --brand-300: #BCB9D5;
  --brand-400: #9A96BF;
  --brand-500: #7874AA;
  --brand-600: #625D98;
  --brand-700: #524D7F;
  --brand-800: #413E65;
  --brand-900: #383557;
  --brand-950: #1F1E2F;
  --brand: #383557;
  --brand-ink: #ffffff;
  --brand-surface: #F6F5F9;
  --brand-border: #CECCE0;
  --brand-hover: #2A2841;
  --brand-pressed: #1C1A2B;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #161523;
    --brand-ink: #DAD9E8;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F6F6F9',
        100: '#EDEDF3',
        200: '#D8D7E5',
        300: '#BCB9D5',
        400: '#9A96BF',
        500: '#7874AA',
        600: '#625D98',
        700: '#524D7F',
        800: '#413E65',
        900: '#383557',
        950: '#1F1E2F',
        DEFAULT: '#383557',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F6F6F9,
  '100': #EDEDF3,
  '200': #D8D7E5,
  '300': #BCB9D5,
  '400': #9A96BF,
  '500': #7874AA,
  '600': #625D98,
  '700': #524D7F,
  '800': #413E65,
  '900': #383557,
  '950': #1F1E2F,
);
$brand-base: #383557;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F6F6F9", "$type": "color" },
      "100": { "$value": "#EDEDF3", "$type": "color" },
      "200": { "$value": "#D8D7E5", "$type": "color" },
      "300": { "$value": "#BCB9D5", "$type": "color" },
      "400": { "$value": "#9A96BF", "$type": "color" },
      "500": { "$value": "#7874AA", "$type": "color" },
      "600": { "$value": "#625D98", "$type": "color" },
      "700": { "$value": "#524D7F", "$type": "color" },
      "800": { "$value": "#413E65", "$type": "color" },
      "900": { "$value": "#383557", "$type": "color" },
      "950": { "$value": "#1F1E2F", "$type": "color" }
    },
    "brandInk": { "$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 #383557 · 11.57:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 11.57:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 1.82:1
AA fail · AA large fail · AAA fail
Reading the other direction: #383557 as text scores 11.57:1 on white and 1.82:1 on black.
Best tinted ink on it, if plain black or white feels flat: #F0EFF5 at 10.12:1.

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
#383557 · 11.57:1
AA on whitealready passes
#383557
The quick fox
#383557 · 11.57:1
AAA on whitealready passes
#383557
The quick fox
#746FA7 · 4.57:1
AA on black+27% L
#746FA7
The quick fox
#9592BC · 7.12:1
AAA on black+38% L
#9592BC

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #383557 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
#383557 on white: 11.57:1
AA ✓ pass · AA-large · AAA
Aa
#383557 on black: 1.82:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #383557 as text on that neutral, and that neutral as text on #383557.

NeutralRatioBoth directions
White11.57:1AaAa
Slate 5011.06:1AaAa
Slate 10010.56:1AaAa
Slate 2009.39:1AaAa
Slate 3007.79:1AaAa
Slate 4004.51:1AaAa
Slate 5002.43:1AaAa
Slate 6001.53:1AaAa
Slate 7001.12:1AaAa
Slate 8001.26:1AaAa
Slate 9001.54:1AaAa
Black1.82:1AaAa
Colour vision deficiency
true color
protanopia · #2B3A58
deuteranopia · #2A3856
tritanopia · #303B42

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. #383557 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.

#F6F6F9
#EDEDF3
#D8D7E5
#BCB9D5
#9A96BF
#7874AA
#625D98
#524D7F
#413E65
#383557
#1F1E2F
Base = 900Lightest = 50 · #F6F6F9Darkest = 950 · #1F1E2FText 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 0.015 287.0);
  --brand-100: oklch(0.94 0.023 287.0);
  --brand-200: oklch(0.88 0.035 287.0);
  --brand-300: oklch(0.80 0.046 287.0);
  --brand-400: oklch(0.72 0.054 287.0);
  --brand-500: oklch(0.64 0.059 287.0);
  --brand-600: oklch(0.56 0.059 287.0);
  --brand-700: oklch(0.48 0.055 287.0);
  --brand-800: oklch(0.40 0.049 287.0);
  --brand-900: oklch(0.32 0.041 287.0);
  --brand-950: oklch(0.24 0.032 287.0);
}

Colors that work with #383557

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#F6F5F9
Tinted page background
Border#CECCE0
Hairlines and dividers
Muted text#5C578F
Captions on the surface
Accent#5A5432
Second voice, not a rival
Dark variant#33304F
Hover, pressed, headers
Light variant#F0EFF5
Selected rows, tints
Dark surface#161523
Dark-mode background
Hover#2A2841
One step down in lightness
Pressed#1C1A2B
Two steps down
Disabled#67629A
Chroma pulled out
Focus ring#3A356C
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 #383557

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
  • Text on black or near-black surfaces
  • 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
  • Weight73/100
  • 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#545735
Analogous left#354357
Analogous right#493557
Split-complement 1#574935
Split-complement 2#435735
Triadic 1#573835
Triadic 2#355738
Tetradic#573543
On the wheel
Base+30°−30°+120°+240°+180°245°

#383557 sits at 245°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red22.0%
Green20.8%
Blue34.1%
R · 0–255
56
0x38
G · 0–255
53
0x35
B · 0–255
87
0x57

CMYK percentages

Cyan35.6%
Magenta39.1%
Yellow0.0%
Key (black)65.9%

Total ink coverage is 141%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#383557 text on a black background

contrast 1.82:1

Card sample

#383557 text on a white background

contrast 11.57:1

Card sample

#383557 on grey

10.56:1

#383557 on its own surface

10.66:1

#383557 on its dark surface

1.56:1

CSS3 live lab

Text font color

The quick brown fox

color: #383557;
Background color
Panel with #383557 background
background-color: #383557;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #383557;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(56, 53, 87, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(56, 53, 87, 0.45);
Border & gradient
Gradient panel
border: 3px solid #383557;
background: linear-gradient(135deg, #383557, #4F3557);
Gradient text

Gradient headline

background: linear-gradient(90deg, #383557, #573557);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #383557;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #383557;
caret-color: #383557;
Left rule
Pull quote or callout
border-left: 4px solid #383557;
Ring + tint
Selected chip
background: #F0EFF5;
box-shadow: inset 0 0 0 2px #383557;
Conic badge
68%
background: conic-gradient(#383557 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #383557 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(56, 53, 87, 0.5)
rgb(56 53 87 / 50%)
#38355780
hsl(245 24% 28% / 50%)
color-mix(in srgb, #383557 50%, transparent)
Alpha8-digit hexFlat on white
10%#3835571a#EBEBEE
20%#38355733#D7D7DD
40%#38355766#AFAEBC
60%#38355799#88869A
80%#383557cc#605D79

Gradients from #383557

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, #514C7D, #383557 45%, #33304F);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #383557, #402A44);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #383557, #545735);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #5D5890 0%, #383557 45%, #33304F 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F6F5F9, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #485F77 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #5D416A 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #33304F 0%, transparent 65%), #383557;

Monochromatic scale

Palettes built from #383557

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.

#383557 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

Very dark values collapse into each other on cheap panels — leave more lightness between your darkest steps than the numbers suggest.

In dark mode

Too dim on dark surfaces at 1.82:1 — lift it to #746FA7 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.

#383557, answered

What color is #383557?

#383557 is a dark soft blue, closest to Dark Slate Blue (ΔE2000 11). It sits at 245° on the hue wheel with 24% saturation and 28% lightness, which reads as cool.

What is the RGB value of #383557?

rgb(56, 53, 87) — 56 red, 53 green and 87 blue out of 255, or 22% / 20.8% / 34.1% by channel.

What is #383557 in HSL and HSV?

hsl(245, 24%, 28%) and hsv(245, 39%, 34%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #383557 a light or a dark color?

It is a dark color. Relative luminance is 0.0408 and perceived brightness is 23%, so white text on it reaches 11.57:1.

Should I use black or white text on #383557?

White. It scores 11.57:1 against #383557, versus 1.82:1 for black — AAA at any size.

Is #383557 accessible on a white background?

#383557 on white scores 11.57:1, which clears AAA at every size.

What is the complementary color of #383557?

#545735 sits directly opposite on the wheel. Softer options are the split-complements #574935 and #435735, which give the same contrast with far less vibration.

What colors go well with #383557?

For interface work: #F6F5F9 as the surface, #CECCE0 for borders, #5C578F for secondary text, #5A5432 as an accent and #33304F for hover and pressed states. For a palette, the analogous pair #354357 and #493557 stays calm, while #545735 is the loudest partner.

What is #383557 in CMYK for printing?

cmyk(36%, 39%, 0%, 66%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #383557 warm or cool?

Cool — it scores 71 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #453557; nudged cooler, #343E59.

Which Tailwind color is closest to #383557?

The gray family — its 500 step is #6b7280, ΔE2000 22.7 away. That is a visible difference, so define #383557 as a custom token rather than reaching for the built-in.

How do I use #383557 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#383557] or text-[#383557], 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 #383557 with 50% opacity?

rgba(56, 53, 87, 0.5), or #38355780 in eight-digit hex. Over white that composites to #9C9AAB; over black, #1C1B2C.

Is #383557 a web-safe color?

No. The nearest web-safe colour is #333366, ΔE2000 5 away. The palette only matters for legacy displays and some email clients now.

What does the color #383557 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 #383557?

The safest is same-hue elevation: linear-gradient(135deg, #514C7D, #383557 45%, #33304F). For more colour, a short hue run to #402A44 keeps it rich without turning muddy.

Work with #383557 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #383557 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.