Skip to content
blue · cool

#3f3d4c

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

Token name suggestion: Dusk Cobalt

RGB
63, 61, 76
HSL
248°, 11%, 27%
CMYK
17, 20, 0, 70
Luminance
0.0492

#3f3d4c is a dark muted blue, 248° on the wheel and 59/100 on the cool side. Put white text on it (10.59:1). As text it scores 10.59:1 on white — safe at any size. Nearest name is Dark Slate Blue, nearest Tailwind family is zinc.

hsl(248 11% 27%)rgb(63 61 76)Base step 900AAA inkCool

At a glance

Every number on this page in one read: what #3f3d4c is made of, how bright it looks, and which way it leans.

Hex
#3f3d4c
Hue
248°
blue
Saturation
11%
muted
Lightness
27%
dark
Brightness
30%
HSV value
Perceived
25%
weighted brightness
Luminance
0.0492
WCAG relative
Temperature
Cool
59/100 cool
Color family
Blue
Tone
Muted
Best ink
White
10.59:1
Closest name
Dark Slate Blue
ΔE2000 17
Chroma
9.9
LCH, 0–130ish
OKLCH L
0.368
perceptual lightness
Tailwind
zinc
500 · ΔE 18.6
Web-safe
#333333
nearest of 216
Where it sits
Hue248° of 360°
Saturation11%
Lightness27%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #3f3d4c.

Temperature
Warm ← → Cool59% 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%
Green68%
Blue11%

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

Every format

HEX#3f3d4c
HEX (8-digit)#3f3d4cff
RGBrgb(63, 61, 76)
RGBArgba(63, 61, 76, 1)
HSLhsl(248, 11%, 27%)
HSV / HSBhsv(248, 20%, 30%)
HWBhwb(248 24% 70%)
CMYKcmyk(17%, 20%, 0%, 70%)
LABlab(26.5 4.5 -8.8)
LCHlch(26.5 9.9 297.0)
OKLCHoklch(0.368 0.026 291.2)
XYZ (D65)xyz(5.02, 4.92, 7.52)
Decimal4144460
Display P3color(display-p3 0.247 0.239 0.298)
Web-safe#333333

Copy-ready code

every platformclick to select
/* CSS */
color: #3f3d4c;
background-color: #3f3d4c;
/* CSS custom property */
--brand: #3f3d4c;
/* Tailwind (arbitrary) */
class="text-[#3f3d4c] bg-[#3f3d4c]"
/* SCSS */
$brand: #3f3d4c;
/* SwiftUI */
Color(red: 0.247, green: 0.239, blue: 0.298)
/* UIKit */
UIColor(red: 0.247, green: 0.239, blue: 0.298, alpha: 1)
/* Android XML */
<color name="brand">#3F3D4C</color>
/* Android Compose */
Color(0xFF3F3D4C)
/* Flutter */
Color(0xFF3F3D4C)
/* Python / OpenCV (BGR) */
(76, 61, 63)
/* Python / PIL (RGB) */
(63, 61, 76)
/* Java AWT */
new Color(63, 61, 76)
/* .NET */
Color.FromArgb(255, 63, 61, 76)
/* OpenGL / Unity (0–1) */
(0.2471f, 0.2392f, 0.2980f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{63,61,76}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #3f3d4c 85%, white);
border-color: color-mix(in oklab, #3f3d4c 40%, transparent);
/* theme-aware in one line */
color: light-dark(#3B3947, #DEDDE4);
/* relative colour syntax */
--hover: hsl(from #3f3d4c 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: #F7F7F8;
  --brand-100: #EFEEF1;
  --brand-200: #DCDBE1;
  --brand-300: #C2C1CD;
  --brand-400: #A4A2B4;
  --brand-500: #86839B;
  --brand-600: #716D88;
  --brand-700: #5E5B71;
  --brand-800: #4B495A;
  --brand-900: #3f3d4c;
  --brand-950: #23222A;
  --brand: #3f3d4c;
  --brand-ink: #ffffff;
  --brand-surface: #F7F7F8;
  --brand-border: #D3D2DB;
  --brand-hover: #2F2D38;
  --brand-pressed: #1E1D24;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #1A191F;
    --brand-ink: #DEDDE4;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F7F7F8',
        100: '#EFEEF1',
        200: '#DCDBE1',
        300: '#C2C1CD',
        400: '#A4A2B4',
        500: '#86839B',
        600: '#716D88',
        700: '#5E5B71',
        800: '#4B495A',
        900: '#3f3d4c',
        950: '#23222A',
        DEFAULT: '#3f3d4c',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F7F7F8,
  '100': #EFEEF1,
  '200': #DCDBE1,
  '300': #C2C1CD,
  '400': #A4A2B4,
  '500': #86839B,
  '600': #716D88,
  '700': #5E5B71,
  '800': #4B495A,
  '900': #3f3d4c,
  '950': #23222A,
);
$brand-base: #3f3d4c;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F7F7F8", "$type": "color" },
      "100": { "$value": "#EFEEF1", "$type": "color" },
      "200": { "$value": "#DCDBE1", "$type": "color" },
      "300": { "$value": "#C2C1CD", "$type": "color" },
      "400": { "$value": "#A4A2B4", "$type": "color" },
      "500": { "$value": "#86839B", "$type": "color" },
      "600": { "$value": "#716D88", "$type": "color" },
      "700": { "$value": "#5E5B71", "$type": "color" },
      "800": { "$value": "#4B495A", "$type": "color" },
      "900": { "$value": "#3f3d4c", "$type": "color" },
      "950": { "$value": "#23222A", "$type": "color" }
    },
    "brandInk": { "$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 #3f3d4c · 10.59:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 10.59:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 1.98:1
AA fail · AA large fail · AAA fail
Reading the other direction: #3f3d4c as text scores 10.59:1 on white and 1.98:1 on black.
Best tinted ink on it, if plain black or white feels flat: #F1F1F4 at 9.39:1.

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
#3f3d4c · 10.59:1
AA on whitealready passes
#3f3d4c
The quick fox
#3f3d4c · 10.59:1
AAA on whitealready passes
#3f3d4c
The quick fox
#75718D · 4.50:1
AA on black+23% L
#75718D
The quick fox
#9693A8 · 7.04:1
AAA on black+35% L
#9693A8

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #3F3D4C 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
#3f3d4c on white: 10.59:1
AA ✓ pass · AA-large · AAA
Aa
#3f3d4c on black: 1.98:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #3f3d4c as text on that neutral, and that neutral as text on #3f3d4c.

NeutralRatioBoth directions
White10.59:1AaAa
Slate 5010.12:1AaAa
Slate 1009.67:1AaAa
Slate 2008.59:1AaAa
Slate 3007.13:1AaAa
Slate 4004.13:1AaAa
Slate 5002.23:1AaAa
Slate 6001.40:1AaAa
Slate 7001.02:1AaAa
Slate 8001.38:1AaAa
Slate 9001.69:1AaAa
Black1.98:1AaAa
Colour vision deficiency
true color
protanopia · #3A3F4D
deuteranopia · #3A3E4C
tritanopia · #3C3F42

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. #3f3d4c 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.

#F7F7F8
#EFEEF1
#DCDBE1
#C2C1CD
#A4A2B4
#86839B
#716D88
#5E5B71
#4B495A
#3f3d4c
#23222A
Base = 900Lightest = 50 · #F7F7F8Darkest = 950 · #23222AText 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 0.006 291.2);
  --brand-100: oklch(0.94 0.010 291.2);
  --brand-200: oklch(0.88 0.015 291.2);
  --brand-300: oklch(0.80 0.020 291.2);
  --brand-400: oklch(0.72 0.024 291.2);
  --brand-500: oklch(0.64 0.026 291.2);
  --brand-600: oklch(0.56 0.026 291.2);
  --brand-700: oklch(0.48 0.024 291.2);
  --brand-800: oklch(0.40 0.022 291.2);
  --brand-900: oklch(0.32 0.018 291.2);
  --brand-950: oklch(0.24 0.014 291.2);
}

Colors that work with #3f3d4c

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#F7F7F8
Tinted page background
Border#D3D2DB
Hairlines and dividers
Muted text#6A667F
Captions on the surface
Accent#4F4C3A
Second voice, not a rival
Dark variant#3B3947
Hover, pressed, headers
Light variant#F1F1F4
Selected rows, tints
Dark surface#1A191F
Dark-mode background
Hover#2F2D38
One step down in lightness
Pressed#1E1D24
Two steps down
Disabled#736F8A
Chroma pulled out
Focus ring#433E5F
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 #3f3d4c

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

Works well for
  • Body text and links on white
  • Borders, dividers and quiet backgrounds
  • Long-form reading 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.

With almost no chroma left, the family association is barely present; treat it as a neutral that happens to lean this way. 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
  • EnergyLow
  • Weight73/100
  • TemperatureCool
  • ApproachabilityBalanced

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#4A4C3D
Analogous left#3D434C
Analogous right#473D4C
Split-complement 1#4C473D
Split-complement 2#434C3D
Triadic 1#4C3F3D
Triadic 2#3D4C3F
Tetradic#4C3D43
On the wheel
Base+30°−30°+120°+240°+180°248°

#3f3d4c sits at 248°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red24.7%
Green23.9%
Blue29.8%
R · 0–255
63
0x3f
G · 0–255
61
0x3d
B · 0–255
76
0x4c

CMYK percentages

Cyan17.1%
Magenta19.7%
Yellow0.0%
Key (black)70.2%

Total ink coverage is 107%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#3f3d4c text on a black background

contrast 1.98:1

Card sample

#3f3d4c text on a white background

contrast 10.59:1

Card sample

#3f3d4c on grey

9.67:1

#3f3d4c on its own surface

9.89:1

#3f3d4c on its dark surface

1.65:1

CSS3 live lab

Text font color

The quick brown fox

color: #3f3d4c;
Background color
Panel with #3f3d4c background
background-color: #3f3d4c;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #3f3d4c;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(63, 61, 76, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(63, 61, 76, 0.45);
Border & gradient
Gradient panel
border: 3px solid #3f3d4c;
background: linear-gradient(135deg, #3f3d4c, #493D4C);
Gradient text

Gradient headline

background: linear-gradient(90deg, #3f3d4c, #4C3D4B);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #3f3d4c;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #3f3d4c;
caret-color: #3f3d4c;
Left rule
Pull quote or callout
border-left: 4px solid #3f3d4c;
Ring + tint
Selected chip
background: #F1F1F4;
box-shadow: inset 0 0 0 2px #3f3d4c;
Conic badge
68%
background: conic-gradient(#3f3d4c 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #3f3d4c 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(63, 61, 76, 0.5)
rgb(63 61 76 / 50%)
#3f3d4c80
hsl(248 11% 27% / 50%)
color-mix(in srgb, #3f3d4c 50%, transparent)
Alpha8-digit hexFlat on white
10%#3f3d4c1a#ECECED
20%#3f3d4c33#D9D8DB
40%#3f3d4c66#B2B1B7
60%#3f3d4c99#8C8B94
80%#3f3d4ccc#656470

Gradients from #3f3d4c

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, #5B586E, #3f3d4c 45%, #3B3947);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #3f3d4c, #3A2F3B);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #3f3d4c, #4A4C3D);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #69667F 0%, #3f3d4c 45%, #3B3947 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F7F7F8, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #545D68 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #584B5D 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #3B3947 0%, transparent 65%), #3f3d4c;

Monochromatic scale

Palettes built from #3f3d4c

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.

#3f3d4c 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
BackgroundsBordersBody textDividers
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 1.98:1 — lift it to #75718D 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.

#3f3d4c, answered

What color is #3f3d4c?

#3f3d4c is a dark muted blue, closest to Dark Slate Blue (ΔE2000 17). It sits at 248° on the hue wheel with 11% saturation and 27% lightness, which reads as cool.

What is the RGB value of #3f3d4c?

rgb(63, 61, 76) — 63 red, 61 green and 76 blue out of 255, or 24.7% / 23.9% / 29.8% by channel.

What is #3f3d4c in HSL and HSV?

hsl(248, 11%, 27%) and hsv(248, 20%, 30%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #3f3d4c a light or a dark color?

It is a dark color. Relative luminance is 0.0492 and perceived brightness is 25%, so white text on it reaches 10.59:1.

Should I use black or white text on #3f3d4c?

White. It scores 10.59:1 against #3f3d4c, versus 1.98:1 for black — AAA at any size.

Is #3f3d4c accessible on a white background?

#3f3d4c on white scores 10.59:1, which clears AAA at every size.

What is the complementary color of #3f3d4c?

#4A4C3D sits directly opposite on the wheel. Softer options are the split-complements #4C473D and #434C3D, which give the same contrast with far less vibration.

What colors go well with #3f3d4c?

For interface work: #F7F7F8 as the surface, #D3D2DB for borders, #6A667F for secondary text, #4F4C3A as an accent and #3B3947 for hover and pressed states. For a palette, the analogous pair #3D434C and #473D4C stays calm, while #4A4C3D is the loudest partner.

What is #3f3d4c in CMYK for printing?

cmyk(17%, 20%, 0%, 70%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #3f3d4c warm or cool?

Cool — it scores 59 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #453D4C; nudged cooler, #3C404D.

Which Tailwind color is closest to #3f3d4c?

The zinc family — its 500 step is #71717a, ΔE2000 18.6 away. That is a visible difference, so define #3f3d4c as a custom token rather than reaching for the built-in.

How do I use #3f3d4c in Tailwind CSS?

Inline it as an arbitrary value with bg-[#3f3d4c] or text-[#3f3d4c], 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 #3f3d4c with 50% opacity?

rgba(63, 61, 76, 0.5), or #3f3d4c80 in eight-digit hex. Over white that composites to #9F9EA6; over black, #201F26.

Is #3f3d4c a web-safe color?

No. The nearest web-safe colour is #333333, ΔE2000 9.6 away. The palette only matters for legacy displays and some email clients now.

What does the color #3f3d4c 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 low chroma the association is faint; it behaves more like a neutral.

What gradient works with #3f3d4c?

The safest is same-hue elevation: linear-gradient(135deg, #5B586E, #3f3d4c 45%, #3B3947). For more colour, a short hue run to #3A2F3B keeps it rich without turning muddy.

Work with #3f3d4c in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #3f3d4c at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.