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blue · cool

#2d2f6f

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

Token name suggestion: Slate Sapphire

RGB
45, 47, 111
HSL
238°, 42%, 31%
CMYK
60, 58, 0, 57
Luminance
0.0374

#2d2f6f is a dark soft blue, 238° on the wheel and 84/100 on the cool side. Put white text on it (12.02:1). As text it scores 12.02:1 on white — safe at any size. Nearest name is Dark Slate Blue, nearest Tailwind family is slate.

hsl(238 42% 31%)rgb(45 47 111)Base step 800AAA inkCool

At a glance

Every number on this page in one read: what #2d2f6f is made of, how bright it looks, and which way it leans.

Hex
#2d2f6f
Hue
238°
blue
Saturation
42%
soft
Lightness
31%
dark
Brightness
44%
HSV value
Perceived
23%
weighted brightness
Luminance
0.0374
WCAG relative
Temperature
Cool
84/100 cool
Color family
Blue
Tone
Soft
Best ink
White
12.02:1
Closest name
Dark Slate Blue
ΔE2000 6.6
Chroma
42.4
LCH, 0–130ish
OKLCH L
0.342
perceptual lightness
Tailwind
slate
500 · ΔE 23.2
Web-safe
#333366
nearest of 216
Where it sits
Hue238° of 360°
Saturation42%
Lightness31%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #2d2f6f.

Temperature
Warm ← → Cool84% 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
Red15%
Green54%
Blue31%

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

Every format

HEX#2d2f6f
HEX (8-digit)#2d2f6fff
RGBrgb(45, 47, 111)
RGBArgba(45, 47, 111, 1)
HSLhsl(238, 42%, 31%)
HSV / HSBhsv(238, 59%, 44%)
HWBhwb(238 18% 56%)
CMYKcmyk(60%, 58%, 0%, 57%)
LABlab(22.8 19.8 -37.5)
LCHlch(22.8 42.4 297.7)
OKLCHoklch(0.342 0.108 277.6)
XYZ (D65)xyz(4.97, 3.74, 15.50)
Decimal2961263
Display P3color(display-p3 0.176 0.184 0.435)
Web-safe#333366

Copy-ready code

every platformclick to select
/* CSS */
color: #2d2f6f;
background-color: #2d2f6f;
/* CSS custom property */
--brand: #2d2f6f;
/* Tailwind (arbitrary) */
class="text-[#2d2f6f] bg-[#2d2f6f]"
/* SCSS */
$brand: #2d2f6f;
/* SwiftUI */
Color(red: 0.176, green: 0.184, blue: 0.435)
/* UIKit */
UIColor(red: 0.176, green: 0.184, blue: 0.435, alpha: 1)
/* Android XML */
<color name="brand">#2D2F6F</color>
/* Android Compose */
Color(0xFF2D2F6F)
/* Flutter */
Color(0xFF2D2F6F)
/* Python / OpenCV (BGR) */
(111, 47, 45)
/* Python / PIL (RGB) */
(45, 47, 111)
/* Java AWT */
new Color(45, 47, 111)
/* .NET */
Color.FromArgb(255, 45, 47, 111)
/* OpenGL / Unity (0–1) */
(0.1765f, 0.1843f, 0.4353f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{45,47,111}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #2d2f6f 85%, white);
border-color: color-mix(in oklab, #2d2f6f 40%, transparent);
/* theme-aware in one line */
color: light-dark(#25265B, #D3D4ED);
/* relative colour syntax */
--hover: hsl(from #2d2f6f 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: #F5F5FA;
  --brand-100: #EBEBF5;
  --brand-200: #D2D2EA;
  --brand-300: #AFB1DF;
  --brand-400: #8789CE;
  --brand-500: #5F62BE;
  --brand-600: #474AAE;
  --brand-700: #3B3D91;
  --brand-800: #2d2f6f;
  --brand-900: #252755;
  --brand-950: #171835;
  --brand: #2d2f6f;
  --brand-ink: #ffffff;
  --brand-surface: #F4F4FA;
  --brand-border: #C5C6E7;
  --brand-hover: #232456;
  --brand-pressed: #18193C;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #141424;
    --brand-ink: #D3D4ED;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F5F5FA',
        100: '#EBEBF5',
        200: '#D2D2EA',
        300: '#AFB1DF',
        400: '#8789CE',
        500: '#5F62BE',
        600: '#474AAE',
        700: '#3B3D91',
        800: '#2d2f6f',
        900: '#252755',
        950: '#171835',
        DEFAULT: '#2d2f6f',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F5F5FA,
  '100': #EBEBF5,
  '200': #D2D2EA,
  '300': #AFB1DF,
  '400': #8789CE,
  '500': #5F62BE,
  '600': #474AAE,
  '700': #3B3D91,
  '800': #2d2f6f,
  '900': #252755,
  '950': #171835,
);
$brand-base: #2d2f6f;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F5F5FA", "$type": "color" },
      "100": { "$value": "#EBEBF5", "$type": "color" },
      "200": { "$value": "#D2D2EA", "$type": "color" },
      "300": { "$value": "#AFB1DF", "$type": "color" },
      "400": { "$value": "#8789CE", "$type": "color" },
      "500": { "$value": "#5F62BE", "$type": "color" },
      "600": { "$value": "#474AAE", "$type": "color" },
      "700": { "$value": "#3B3D91", "$type": "color" },
      "800": { "$value": "#2d2f6f", "$type": "color" },
      "900": { "$value": "#252755", "$type": "color" },
      "950": { "$value": "#171835", "$type": "color" }
    },
    "brandInk": { "$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 #2d2f6f · 12.02:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 12.02:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 1.75:1
AA fail · AA large fail · AAA fail
Reading the other direction: #2d2f6f as text scores 12.02:1 on white and 1.75:1 on black.
Best tinted ink on it, if plain black or white feels flat: #EDEDF8 at 10.34:1.

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
#2d2f6f · 12.02:1
AA on whitealready passes
#2d2f6f
The quick fox
#2d2f6f · 12.02:1
AAA on whitealready passes
#2d2f6f
The quick fox
#6C6FC4 · 4.71:1
AA on black+29% L
#6C6FC4
The quick fox
#9193D2 · 7.31:1
AAA on black+39% L
#9193D2

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #2D2F6F 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
#2d2f6f on white: 12.02:1
AA ✓ pass · AA-large · AAA
Aa
#2d2f6f on black: 1.75:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #2d2f6f as text on that neutral, and that neutral as text on #2d2f6f.

NeutralRatioBoth directions
White12.02:1AaAa
Slate 5011.48:1AaAa
Slate 10010.97:1AaAa
Slate 2009.75:1AaAa
Slate 3008.09:1AaAa
Slate 4004.69:1AaAa
Slate 5002.52:1AaAa
Slate 6001.59:1AaAa
Slate 7001.16:1AaAa
Slate 8001.22:1AaAa
Slate 9001.49:1AaAa
Black1.75:1AaAa
Colour vision deficiency
true color
protanopia · #043971
deuteranopia · #00346E
tritanopia · #083E4A

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. #2d2f6f 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.

#F5F5FA
#EBEBF5
#D2D2EA
#AFB1DF
#8789CE
#5F62BE
#474AAE
#3B3D91
#2d2f6f
#252755
#171835
Base = 800Lightest = 50 · #F5F5FADarkest = 950 · #171835Text step on white = 500
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 0.027 277.6);
  --brand-100: oklch(0.94 0.043 277.6);
  --brand-200: oklch(0.88 0.065 277.6);
  --brand-300: oklch(0.80 0.085 277.6);
  --brand-400: oklch(0.72 0.100 277.6);
  --brand-500: oklch(0.64 0.108 277.6);
  --brand-600: oklch(0.56 0.108 277.6);
  --brand-700: oklch(0.48 0.102 277.6);
  --brand-800: oklch(0.40 0.091 277.6);
  --brand-900: oklch(0.32 0.076 277.6);
  --brand-950: oklch(0.24 0.060 277.6);
}

Colors that work with #2d2f6f

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#F4F4FA
Tinted page background
Border#C5C6E7
Hairlines and dividers
Muted text#4B4D9B
Captions on the surface
Accent#725E2A
Second voice, not a rival
Dark variant#25265B
Hover, pressed, headers
Light variant#EDEDF8
Selected rows, tints
Dark surface#141424
Dark-mode background
Hover#232456
One step down in lightness
Pressed#18193C
Two steps down
Disabled#6C6DA1
Chroma pulled out
Focus ring#2A2D86
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 #2d2f6f

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
  • Weight69/100
  • 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#6F6D2D
Analogous left#2D506F
Analogous right#4C2D6F
Split-complement 1#6F4C2D
Split-complement 2#506F2D
Triadic 1#6F2D2F
Triadic 2#2F6F2D
Tetradic#6F2D50
On the wheel
Base+30°−30°+120°+240°+180°238°

#2d2f6f sits at 238°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red17.6%
Green18.4%
Blue43.5%
R · 0–255
45
0x2d
G · 0–255
47
0x2f
B · 0–255
111
0x6f

CMYK percentages

Cyan59.5%
Magenta57.7%
Yellow0.0%
Key (black)56.5%

Total ink coverage is 174%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#2d2f6f text on a black background

contrast 1.75:1

Card sample

#2d2f6f text on a white background

contrast 12.02:1

Card sample

#2d2f6f on grey

10.97:1

#2d2f6f on its own surface

10.97:1

#2d2f6f on its dark surface

1.51:1

CSS3 live lab

Text font color

The quick brown fox

color: #2d2f6f;
Background color
Panel with #2d2f6f background
background-color: #2d2f6f;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #2d2f6f;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(45, 47, 111, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(45, 47, 111, 0.45);
Border & gradient
Gradient panel
border: 3px solid #2d2f6f;
background: linear-gradient(135deg, #2d2f6f, #572D6F);
Gradient text

Gradient headline

background: linear-gradient(90deg, #2d2f6f, #682D6F);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #2d2f6f;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #2d2f6f;
caret-color: #2d2f6f;
Left rule
Pull quote or callout
border-left: 4px solid #2d2f6f;
Ring + tint
Selected chip
background: #EDEDF8;
box-shadow: inset 0 0 0 2px #2d2f6f;
Conic badge
68%
background: conic-gradient(#2d2f6f 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #2d2f6f 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(45, 47, 111, 0.5)
rgb(45 47 111 / 50%)
#2d2f6f80
hsl(238 42% 31% / 50%)
color-mix(in srgb, #2d2f6f 50%, transparent)
Alpha8-digit hexFlat on white
10%#2d2f6f1a#EAEAF1
20%#2d2f6f33#D5D5E2
40%#2d2f6f66#ABACC5
60%#2d2f6f99#8182A9
80%#2d2f6fcc#57598C

Gradients from #2d2f6f

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, #3F419B, #2d2f6f 45%, #25265B);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #2d2f6f, #4A2459);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #2d2f6f, #6F6D2D);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #484BB0 0%, #2d2f6f 45%, #25265B 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F4F4FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #3C7193 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #623685 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #25265B 0%, transparent 65%), #2d2f6f;

Monochromatic scale

Palettes built from #2d2f6f

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.

#2d2f6f 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 1.75:1 — lift it to #6C6FC4 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.

#2d2f6f, answered

What color is #2d2f6f?

#2d2f6f is a dark soft blue, closest to Dark Slate Blue (ΔE2000 6.6). It sits at 238° on the hue wheel with 42% saturation and 31% lightness, which reads as cool.

What is the RGB value of #2d2f6f?

rgb(45, 47, 111) — 45 red, 47 green and 111 blue out of 255, or 17.6% / 18.4% / 43.5% by channel.

What is #2d2f6f in HSL and HSV?

hsl(238, 42%, 31%) and hsv(238, 59%, 44%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #2d2f6f a light or a dark color?

It is a dark color. Relative luminance is 0.0374 and perceived brightness is 23%, so white text on it reaches 12.02:1.

Should I use black or white text on #2d2f6f?

White. It scores 12.02:1 against #2d2f6f, versus 1.75:1 for black — AAA at any size.

Is #2d2f6f accessible on a white background?

#2d2f6f on white scores 12.02:1, which clears AAA at every size.

What is the complementary color of #2d2f6f?

#6F6D2D sits directly opposite on the wheel. Softer options are the split-complements #6F4C2D and #506F2D, which give the same contrast with far less vibration.

What colors go well with #2d2f6f?

For interface work: #F4F4FA as the surface, #C5C6E7 for borders, #4B4D9B for secondary text, #725E2A as an accent and #25265B for hover and pressed states. For a palette, the analogous pair #2D506F and #4C2D6F stays calm, while #6F6D2D is the loudest partner.

What is #2d2f6f in CMYK for printing?

cmyk(60%, 58%, 0%, 57%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #2d2f6f warm or cool?

Cool — it scores 84 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #432D6F; nudged cooler, #2B4471.

Which Tailwind color is closest to #2d2f6f?

The slate family — its 500 step is #64748b, ΔE2000 23.2 away. That is a visible difference, so define #2d2f6f as a custom token rather than reaching for the built-in.

How do I use #2d2f6f in Tailwind CSS?

Inline it as an arbitrary value with bg-[#2d2f6f] or text-[#2d2f6f], 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 #2d2f6f with 50% opacity?

rgba(45, 47, 111, 0.5), or #2d2f6f80 in eight-digit hex. Over white that composites to #9697B7; over black, #171838.

Is #2d2f6f a web-safe color?

No. The nearest web-safe colour is #333366, ΔE2000 3.1 away. The palette only matters for legacy displays and some email clients now.

What does the color #2d2f6f 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 #2d2f6f?

The safest is same-hue elevation: linear-gradient(135deg, #3F419B, #2d2f6f 45%, #25265B). For more colour, a short hue run to #4A2459 keeps it rich without turning muddy.

Work with #2d2f6f in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #2d2f6f at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.