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blue · cool

#0f088f

a dark, electric blue · cool · closest name: Dark Blue

Token name suggestion: Slate Harbour

RGB
15, 8, 143
HSL
243°, 89%, 30%
CMYK
90, 94, 0, 44
Luminance
0.0226

#0f088f is a dark electric blue, 243° on the wheel and 82/100 on the cool side. Put white text on it (14.47:1). As text it scores 14.47:1 on white — safe at any size. Nearest name is Dark Blue, nearest Tailwind family is indigo.

hsl(243 89% 30%)rgb(15 8 143)Base step 800AAA inkCool

At a glance

Every number on this page in one read: what #0f088f is made of, how bright it looks, and which way it leans.

Hex
#0f088f
Hue
243°
blue
Saturation
89%
electric
Lightness
30%
dark
Brightness
56%
HSV value
Perceived
19%
weighted brightness
Luminance
0.0226
WCAG relative
Temperature
Cool
82/100 cool
Color family
Blue
Tone
Electric
Best ink
White
14.47:1
Closest name
Dark Blue
ΔE2000 1.4
Chroma
83.6
LCH, 0–130ish
OKLCH L
0.305
perceptual lightness
Tailwind
indigo
500 · ΔE 27.6
Web-safe
#000099
nearest of 216
Where it sits
Hue243° of 360°
Saturation89%
Lightness30%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #0f088f.

Temperature
Warm ← → Cool82% 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
Red4%
Green8%
Blue88%

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

Every format

HEX#0f088f
HEX (8-digit)#0f088fff
RGBrgb(15, 8, 143)
RGBArgba(15, 8, 143, 1)
HSLhsl(243, 89%, 30%)
HSV / HSBhsv(243, 94%, 56%)
HWBhwb(243 3% 44%)
CMYKcmyk(90%, 94%, 0%, 44%)
LABlab(16.8 49.0 -67.8)
LCHlch(16.8 83.6 305.9)
OKLCHoklch(0.305 0.196 267.6)
XYZ (D65)xyz(5.24, 2.26, 26.14)
Decimal985231
Display P3color(display-p3 0.059 0.031 0.561)
Web-safe#000099

Copy-ready code

every platformclick to select
/* CSS */
color: #0f088f;
background-color: #0f088f;
/* CSS custom property */
--brand: #0f088f;
/* Tailwind (arbitrary) */
class="text-[#0f088f] bg-[#0f088f]"
/* SCSS */
$brand: #0f088f;
/* SwiftUI */
Color(red: 0.059, green: 0.031, blue: 0.561)
/* UIKit */
UIColor(red: 0.059, green: 0.031, blue: 0.561, alpha: 1)
/* Android XML */
<color name="brand">#0F088F</color>
/* Android Compose */
Color(0xFF0F088F)
/* Flutter */
Color(0xFF0F088F)
/* Python / OpenCV (BGR) */
(143, 8, 15)
/* Python / PIL (RGB) */
(15, 8, 143)
/* Java AWT */
new Color(15, 8, 143)
/* .NET */
Color.FromArgb(255, 15, 8, 143)
/* OpenGL / Unity (0–1) */
(0.0588f, 0.0314f, 0.5608f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{15,8,143}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #0f088f 85%, white);
border-color: color-mix(in oklab, #0f088f 40%, transparent);
/* theme-aware in one line */
color: light-dark(#0D0779, #D4D3EE);
/* relative colour syntax */
--hover: hsl(from #0f088f 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: #F2F2FD;
  --brand-100: #E6E5FB;
  --brand-200: #C6C4F8;
  --brand-300: #9A95F9;
  --brand-400: #6760F6;
  --brand-500: #352AF3;
  --brand-600: #180DE8;
  --brand-700: #140BC1;
  --brand-800: #0f088f;
  --brand-900: #100B70;
  --brand-950: #0A0746;
  --brand: #0f088f;
  --brand-ink: #ffffff;
  --brand-surface: #F5F4FA;
  --brand-border: #C2C0ED;
  --brand-hover: #0B066D;
  --brand-pressed: #08044B;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #151424;
    --brand-ink: #D4D3EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F2F2FD',
        100: '#E6E5FB',
        200: '#C6C4F8',
        300: '#9A95F9',
        400: '#6760F6',
        500: '#352AF3',
        600: '#180DE8',
        700: '#140BC1',
        800: '#0f088f',
        900: '#100B70',
        950: '#0A0746',
        DEFAULT: '#0f088f',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F2F2FD,
  '100': #E6E5FB,
  '200': #C6C4F8,
  '300': #9A95F9,
  '400': #6760F6,
  '500': #352AF3,
  '600': #180DE8,
  '700': #140BC1,
  '800': #0f088f,
  '900': #100B70,
  '950': #0A0746,
);
$brand-base: #0f088f;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F2F2FD", "$type": "color" },
      "100": { "$value": "#E6E5FB", "$type": "color" },
      "200": { "$value": "#C6C4F8", "$type": "color" },
      "300": { "$value": "#9A95F9", "$type": "color" },
      "400": { "$value": "#6760F6", "$type": "color" },
      "500": { "$value": "#352AF3", "$type": "color" },
      "600": { "$value": "#180DE8", "$type": "color" },
      "700": { "$value": "#140BC1", "$type": "color" },
      "800": { "$value": "#0f088f", "$type": "color" },
      "900": { "$value": "#100B70", "$type": "color" },
      "950": { "$value": "#0A0746", "$type": "color" }
    },
    "brandInk": { "$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 #0f088f · 14.47:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 14.47:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 1.45:1
AA fail · AA large fail · AAA fail
Reading the other direction: #0f088f as text scores 14.47:1 on white and 1.45:1 on black.
Best tinted ink on it, if plain black or white feels flat: #E8E7FE at 11.91:1.

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
#0f088f · 14.47:1
AA on whitealready passes
#0f088f
The quick fox
#0f088f · 14.47:1
AAA on whitealready passes
#0f088f
The quick fox
#665EF6 · 4.50:1
AA on black+37% L
#665EF6
The quick fox
#8F89F8 · 7.10:1
AAA on black+46% L
#8F89F8

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #0F088F 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
#0f088f on white: 14.47:1
AA ✓ pass · AA-large · AAA
Aa
#0f088f on black: 1.45:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #0f088f as text on that neutral, and that neutral as text on #0f088f.

NeutralRatioBoth directions
White14.47:1AaAa
Slate 5013.83:1AaAa
Slate 10013.20:1AaAa
Slate 20011.73:1AaAa
Slate 3009.74:1AaAa
Slate 4005.64:1AaAa
Slate 5003.04:1AaAa
Slate 6001.91:1AaAa
Slate 7001.40:1AaAa
Slate 8001.01:1AaAa
Slate 9001.23:1AaAa
Black1.45:1AaAa
Colour vision deficiency
true color
protanopia · #003092
deuteranopia · #00228D
tritanopia · #003A52

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. #0f088f 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.

#F2F2FD
#E6E5FB
#C6C4F8
#9A95F9
#6760F6
#352AF3
#180DE8
#140BC1
#0f088f
#100B70
#0A0746
Base = 800Lightest = 50 · #F2F2FDDarkest = 950 · #0A0746Text step on white = 400
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 0.049 267.6);
  --brand-100: oklch(0.94 0.078 267.6);
  --brand-200: oklch(0.88 0.118 267.6);
  --brand-300: oklch(0.80 0.153 267.6);
  --brand-400: oklch(0.72 0.180 267.6);
  --brand-500: oklch(0.64 0.196 267.6);
  --brand-600: oklch(0.56 0.196 267.6);
  --brand-700: oklch(0.48 0.184 267.6);
  --brand-800: oklch(0.40 0.165 267.6);
  --brand-900: oklch(0.32 0.137 267.6);
  --brand-950: oklch(0.24 0.108 267.6);
}

Colors that work with #0f088f

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#F5F4FA
Tinted page background
Border#C2C0ED
Hairlines and dividers
Muted text#4F4B9B
Captions on the surface
Accent#927605
Second voice, not a rival
Dark variant#0D0779
Hover, pressed, headers
Light variant#E8E7FE
Selected rows, tints
Dark surface#151424
Dark-mode background
Hover#0B066D
One step down in lightness
Pressed#08044B
Two steps down
Disabled#6B689F
Chroma pulled out
Focus ring#0901AB
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 #0f088f

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

Works well for
  • Body text and links on white
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Headers, footers and dark-mode surfaces
  • Brand accents, badges and data highlights
Use with care
  • Text on black or near-black surfaces
  • Full-page backgrounds — tiring over long sessions
  • 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.

At this chroma the association is amplified — it will dominate anything placed beside it, so give it space and use it sparingly. 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
  • EnergyHigh
  • Weight70/100
  • 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#888F08
Analogous left#08458F
Analogous right#52088F
Split-complement 1#8F5208
Split-complement 2#458F08
Triadic 1#8F0F08
Triadic 2#088F0F
Tetradic#8F0845
On the wheel
Base+30°−30°+120°+240°+180°243°

#0f088f sits at 243°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red5.9%
Green3.1%
Blue56.1%
R · 0–255
15
0x0f
G · 0–255
8
0x08
B · 0–255
143
0x8f

CMYK percentages

Cyan89.5%
Magenta94.4%
Yellow0.0%
Key (black)43.9%

Total ink coverage is 228%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#0f088f text on a black background

contrast 1.45:1

Card sample

#0f088f text on a white background

contrast 14.47:1

Card sample

#0f088f on grey

13.20:1

#0f088f on its own surface

13.23:1

#0f088f on its dark surface

1.25:1

CSS3 live lab

Text font color

The quick brown fox

color: #0f088f;
Background color
Panel with #0f088f background
background-color: #0f088f;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #0f088f;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(15, 8, 143, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(15, 8, 143, 0.45);
Border & gradient
Gradient panel
border: 3px solid #0f088f;
background: linear-gradient(135deg, #0f088f, #69088F);
Gradient text

Gradient headline

background: linear-gradient(90deg, #0f088f, #8B088F);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #0f088f;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #0f088f;
caret-color: #0f088f;
Left rule
Pull quote or callout
border-left: 4px solid #0f088f;
Ring + tint
Selected chip
background: #E8E7FE;
box-shadow: inset 0 0 0 2px #0f088f;
Conic badge
68%
background: conic-gradient(#0f088f 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #0f088f 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(15, 8, 143, 0.5)
rgb(15 8 143 / 50%)
#0f088f80
hsl(243 89% 30% / 50%)
color-mix(in srgb, #0f088f 50%, transparent)
Alpha8-digit hexFlat on white
10%#0f088f1a#E7E6F4
20%#0f088f33#CFCEE9
40%#0f088f66#9F9CD2
60%#0f088f99#6F6BBC
80%#0f088fcc#3F39A5

Gradients from #0f088f

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, #150BC9, #0f088f 45%, #0D0779);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #0f088f, #5D0672);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #0f088f, #888F08);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #180DE6 0%, #0f088f 45%, #0D0779 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F5F4FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #0B6BBF 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #710AAC 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #0D0779 0%, transparent 65%), #0f088f;

Monochromatic scale

Palettes built from #0f088f

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.

#0f088f 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

Sits outside most CMYK gamuts — expect a duller press result, or specify a spot ink.

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 1.45:1 — lift it to #665EF6 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.

#0f088f, answered

What color is #0f088f?

#0f088f is a dark electric blue, closest to Dark Blue (ΔE2000 1.4). It sits at 243° on the hue wheel with 89% saturation and 30% lightness, which reads as cool.

What is the RGB value of #0f088f?

rgb(15, 8, 143) — 15 red, 8 green and 143 blue out of 255, or 5.9% / 3.1% / 56.1% by channel.

What is #0f088f in HSL and HSV?

hsl(243, 89%, 30%) and hsv(243, 94%, 56%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #0f088f a light or a dark color?

It is a dark color. Relative luminance is 0.0226 and perceived brightness is 19%, so white text on it reaches 14.47:1.

Should I use black or white text on #0f088f?

White. It scores 14.47:1 against #0f088f, versus 1.45:1 for black — AAA at any size.

Is #0f088f accessible on a white background?

#0f088f on white scores 14.47:1, which clears AAA at every size.

What is the complementary color of #0f088f?

#888F08 sits directly opposite on the wheel. Softer options are the split-complements #8F5208 and #458F08, which give the same contrast with far less vibration.

What colors go well with #0f088f?

For interface work: #F5F4FA as the surface, #C2C0ED for borders, #4F4B9B for secondary text, #927605 as an accent and #0D0779 for hover and pressed states. For a palette, the analogous pair #08458F and #52088F stays calm, while #888F08 is the loudest partner.

What is #0f088f in CMYK for printing?

cmyk(90%, 94%, 0%, 44%). This is a screen-to-ink approximation — a color this saturated sits outside most CMYK gamuts and will print duller than it looks here.

Is #0f088f warm or cool?

Cool — it scores 82 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #40088F; nudged cooler, #062B90.

Which Tailwind color is closest to #0f088f?

The indigo family — its 500 step is #6366f1, ΔE2000 27.6 away. That is a visible difference, so define #0f088f as a custom token rather than reaching for the built-in.

How do I use #0f088f in Tailwind CSS?

Inline it as an arbitrary value with bg-[#0f088f] or text-[#0f088f], 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 #0f088f with 50% opacity?

rgba(15, 8, 143, 0.5), or #0f088f80 in eight-digit hex. Over white that composites to #8784C7; over black, #080448.

Is #0f088f a web-safe color?

No. The nearest web-safe colour is #000099, ΔE2000 1.5 away. The palette only matters for legacy displays and some email clients now.

What does the color #0f088f 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 chroma the effect is amplified — it will dominate whatever sits beside it.

What gradient works with #0f088f?

The safest is same-hue elevation: linear-gradient(135deg, #150BC9, #0f088f 45%, #0D0779). For more colour, a short hue run to #5D0672 keeps it rich without turning muddy.

Work with #0f088f in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #0f088f at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.