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blue · cool

#415366

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

Token name suggestion: Forest Sapphire

RGB
65, 83, 102
HSL
211°, 22%, 33%
CMYK
36, 19, 0, 60
Luminance
0.0827

#415366 is a dark soft blue, 211° on the wheel and 81/100 on the cool side. Put white text on it (7.91:1). As text it scores 7.91:1 on white — safe at any size. Nearest name is Dark Slate Blue, nearest Tailwind family is slate.

hsl(211 22% 33%)rgb(65 83 102)Base step 800AAA inkCool

At a glance

Every number on this page in one read: what #415366 is made of, how bright it looks, and which way it leans.

Hex
#415366
Hue
211°
blue
Saturation
22%
soft
Lightness
33%
dark
Brightness
40%
HSV value
Perceived
32%
weighted brightness
Luminance
0.0827
WCAG relative
Temperature
Cool
81/100 cool
Color family
Blue
Tone
Soft
Best ink
White
7.91:1
Closest name
Dark Slate Blue
ΔE2000 11.1
Chroma
13.3
LCH, 0–130ish
OKLCH L
0.435
perceptual lightness
Tailwind
slate
500 · ΔE 12.5
Web-safe
#336666
nearest of 216
Where it sits
Hue211° of 360°
Saturation22%
Lightness33%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #415366.

Temperature
Warm ← → Cool81% 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
Red14%
Green75%
Blue12%

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

Every format

HEX#415366
HEX (8-digit)#415366ff
RGBrgb(65, 83, 102)
RGBArgba(65, 83, 102, 1)
HSLhsl(211, 22%, 33%)
HSV / HSBhsv(211, 36%, 40%)
HWBhwb(211 25% 60%)
CMYKcmyk(36%, 19%, 0%, 60%)
LABlab(34.5 -1.8 -13.2)
LCHlch(34.5 13.3 262.4)
OKLCHoklch(0.435 0.039 250.1)
XYZ (D65)xyz(7.67, 8.27, 13.76)
Decimal4281190
Display P3color(display-p3 0.255 0.325 0.400)
Web-safe#336666

Copy-ready code

every platformclick to select
/* CSS */
color: #415366;
background-color: #415366;
/* CSS custom property */
--brand: #415366;
/* Tailwind (arbitrary) */
class="text-[#415366] bg-[#415366]"
/* SCSS */
$brand: #415366;
/* SwiftUI */
Color(red: 0.255, green: 0.325, blue: 0.400)
/* UIKit */
UIColor(red: 0.255, green: 0.325, blue: 0.400, alpha: 1)
/* Android XML */
<color name="brand">#415366</color>
/* Android Compose */
Color(0xFF415366)
/* Flutter */
Color(0xFF415366)
/* Python / OpenCV (BGR) */
(102, 83, 65)
/* Python / PIL (RGB) */
(65, 83, 102)
/* Java AWT */
new Color(65, 83, 102)
/* .NET */
Color.FromArgb(255, 65, 83, 102)
/* OpenGL / Unity (0–1) */
(0.2549f, 0.3255f, 0.4000f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{65,83,102}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #415366 85%, white);
border-color: color-mix(in oklab, #415366 40%, transparent);
/* theme-aware in one line */
color: light-dark(#323F4E, #DAE0E7);
/* relative colour syntax */
--hover: hsl(from #415366 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: #EDF0F2;
  --brand-200: #D7DEE4;
  --brand-300: #BAC7D3;
  --brand-400: #98AABE;
  --brand-500: #768EA8;
  --brand-600: #5F7A96;
  --brand-700: #4F657D;
  --brand-800: #415366;
  --brand-900: #313D4A;
  --brand-950: #1E262E;
  --brand: #415366;
  --brand-ink: #ffffff;
  --brand-surface: #F6F7F9;
  --brand-border: #CDD6DF;
  --brand-hover: #334150;
  --brand-pressed: #252F3A;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #161C22;
    --brand-ink: #DAE0E7;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F6F7F9',
        100: '#EDF0F2',
        200: '#D7DEE4',
        300: '#BAC7D3',
        400: '#98AABE',
        500: '#768EA8',
        600: '#5F7A96',
        700: '#4F657D',
        800: '#415366',
        900: '#313D4A',
        950: '#1E262E',
        DEFAULT: '#415366',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F6F7F9,
  '100': #EDF0F2,
  '200': #D7DEE4,
  '300': #BAC7D3,
  '400': #98AABE,
  '500': #768EA8,
  '600': #5F7A96,
  '700': #4F657D,
  '800': #415366,
  '900': #313D4A,
  '950': #1E262E,
);
$brand-base: #415366;
$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": "#EDF0F2", "$type": "color" },
      "200": { "$value": "#D7DEE4", "$type": "color" },
      "300": { "$value": "#BAC7D3", "$type": "color" },
      "400": { "$value": "#98AABE", "$type": "color" },
      "500": { "$value": "#768EA8", "$type": "color" },
      "600": { "$value": "#5F7A96", "$type": "color" },
      "700": { "$value": "#4F657D", "$type": "color" },
      "800": { "$value": "#415366", "$type": "color" },
      "900": { "$value": "#313D4A", "$type": "color" },
      "950": { "$value": "#1E262E", "$type": "color" }
    },
    "brandInk": { "$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 #415366 · 7.91:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 7.91:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 2.65:1
AA fail · AA large fail · AAA fail
Reading the other direction: #415366 as text scores 7.91:1 on white and 2.65:1 on black.
Best tinted ink on it, if plain black or white feels flat: #EFF2F5 at 7.04:1.

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
#415366 · 7.91:1
AA on whitealready passes
#415366
The quick fox
#415366 · 7.91:1
AAA on whitealready passes
#415366
The quick fox
#5F7995 · 4.66:1
AA on black+15% L
#5F7995
The quick fox
#8198AF · 7.04:1
AAA on black+27% L
#8198AF

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #415366 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
#415366 on white: 7.91:1
AA ✓ pass · AA-large · AAA
Aa
#415366 on black: 2.65:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #415366 as text on that neutral, and that neutral as text on #415366.

NeutralRatioBoth directions
White7.91:1AaAa
Slate 507.56:1AaAa
Slate 1007.22:1AaAa
Slate 2006.42:1AaAa
Slate 3005.33:1AaAa
Slate 4003.09:1AaAa
Slate 5001.66:1AaAa
Slate 6001.04:1AaAa
Slate 7001.31:1AaAa
Slate 8001.85:1AaAa
Slate 9002.26:1AaAa
Black2.65:1AaAa
Colour vision deficiency
true color
protanopia · #4C5367
deuteranopia · #475066
tritanopia · #355759

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. #415366 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.

#F6F7F9
#EDF0F2
#D7DEE4
#BAC7D3
#98AABE
#768EA8
#5F7A96
#4F657D
#415366
#313D4A
#1E262E
Base = 800Lightest = 50 · #F6F7F9Darkest = 950 · #1E262EText step on white = 700
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 0.010 250.1);
  --brand-100: oklch(0.94 0.016 250.1);
  --brand-200: oklch(0.88 0.023 250.1);
  --brand-300: oklch(0.80 0.030 250.1);
  --brand-400: oklch(0.72 0.036 250.1);
  --brand-500: oklch(0.64 0.039 250.1);
  --brand-600: oklch(0.56 0.039 250.1);
  --brand-700: oklch(0.48 0.036 250.1);
  --brand-800: oklch(0.40 0.033 250.1);
  --brand-900: oklch(0.32 0.027 250.1);
  --brand-950: oklch(0.24 0.021 250.1);
}

Colors that work with #415366

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#CDD6DF
Hairlines and dividers
Muted text#59728C
Captions on the surface
Accent#69493E
Second voice, not a rival
Dark variant#323F4E
Hover, pressed, headers
Light variant#EFF2F5
Selected rows, tints
Dark surface#161C22
Dark-mode background
Hover#334150
One step down in lightness
Pressed#252F3A
Two steps down
Disabled#728BA5
Chroma pulled out
Focus ring#3F5D7C
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 #415366

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
  • Weight67/100
  • 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#665441
Analogous left#416566
Analogous right#414166
Split-complement 1#664141
Split-complement 2#656641
Triadic 1#664153
Triadic 2#536641
Tetradic#664165
On the wheel
Base+30°−30°+120°+240°+180°211°

#415366 sits at 211°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red25.5%
Green32.5%
Blue40.0%
R · 0–255
65
0x41
G · 0–255
83
0x53
B · 0–255
102
0x66

CMYK percentages

Cyan36.3%
Magenta18.6%
Yellow0.0%
Key (black)60.0%

Total ink coverage is 115%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#415366 text on a black background

contrast 2.65:1

Card sample

#415366 text on a white background

contrast 7.91:1

Card sample

#415366 on grey

7.22:1

#415366 on its own surface

7.38:1

#415366 on its dark surface

2.17:1

CSS3 live lab

Text font color

The quick brown fox

color: #415366;
Background color
Panel with #415366 background
background-color: #415366;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #415366;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(65, 83, 102, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(65, 83, 102, 0.45);
Border & gradient
Gradient panel
border: 3px solid #415366;
background: linear-gradient(135deg, #415366, #484166);
Gradient text

Gradient headline

background: linear-gradient(90deg, #415366, #514166);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #415366;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #415366;
caret-color: #415366;
Left rule
Pull quote or callout
border-left: 4px solid #415366;
Ring + tint
Selected chip
background: #EFF2F5;
box-shadow: inset 0 0 0 2px #415366;
Conic badge
68%
background: conic-gradient(#415366 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #415366 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(65, 83, 102, 0.5)
rgb(65 83 102 / 50%)
#41536680
hsl(211 22% 33% / 50%)
color-mix(in srgb, #415366 50%, transparent)
Alpha8-digit hexFlat on white
10%#4153661a#ECEEF0
20%#41536633#D9DDE0
40%#41536666#B3BAC2
60%#41536699#8D98A3
80%#415366cc#677585

Gradients from #415366

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, #59718B, #415366 45%, #323F4E);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #415366, #3D3553);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #415366, #665441);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #65819D 0%, #415366 45%, #323F4E 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%, #558582 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #514D79 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #323F4E 0%, transparent 65%), #415366;

Monochromatic scale

Palettes built from #415366

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.

#415366 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 2.65:1 — lift it to #5F7995 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.

#415366, answered

What color is #415366?

#415366 is a dark soft blue, closest to Dark Slate Blue (ΔE2000 11.1). It sits at 211° on the hue wheel with 22% saturation and 33% lightness, which reads as cool.

What is the RGB value of #415366?

rgb(65, 83, 102) — 65 red, 83 green and 102 blue out of 255, or 25.5% / 32.5% / 40% by channel.

What is #415366 in HSL and HSV?

hsl(211, 22%, 33%) and hsv(211, 36%, 40%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #415366 a light or a dark color?

It is a dark color. Relative luminance is 0.0827 and perceived brightness is 32%, so white text on it reaches 7.91:1.

Should I use black or white text on #415366?

White. It scores 7.91:1 against #415366, versus 2.65:1 for black — AAA at any size.

Is #415366 accessible on a white background?

#415366 on white scores 7.91:1, which clears AAA at every size.

What is the complementary color of #415366?

#665441 sits directly opposite on the wheel. Softer options are the split-complements #664141 and #656641, which give the same contrast with far less vibration.

What colors go well with #415366?

For interface work: #F6F7F9 as the surface, #CDD6DF for borders, #59728C for secondary text, #69493E as an accent and #323F4E for hover and pressed states. For a palette, the analogous pair #416566 and #414166 stays calm, while #665441 is the loudest partner.

What is #415366 in CMYK for printing?

cmyk(36%, 19%, 0%, 60%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #415366 warm or cool?

Cool — it scores 81 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #414566; nudged cooler, #364658.

Which Tailwind color is closest to #415366?

The slate family — its 500 step is #64748b, ΔE2000 12.5 away. That is a visible difference, so define #415366 as a custom token rather than reaching for the built-in.

How do I use #415366 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#415366] or text-[#415366], 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 #415366 with 50% opacity?

rgba(65, 83, 102, 0.5), or #41536680 in eight-digit hex. Over white that composites to #A0A9B3; over black, #212A33.

Is #415366 a web-safe color?

No. The nearest web-safe colour is #336666, ΔE2000 15.9 away. The palette only matters for legacy displays and some email clients now.

What does the color #415366 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 #415366?

The safest is same-hue elevation: linear-gradient(135deg, #59718B, #415366 45%, #323F4E). For more colour, a short hue run to #3D3553 keeps it rich without turning muddy.

Work with #415366 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #415366 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.