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blue · cool

#2b2afb

a balanced, electric blue · cool · closest name: Blue

Token name suggestion: Atlas Denim

RGB
43, 42, 251
HSL
240°, 96%, 58%
CMYK
83, 83, 0, 2
Luminance
0.0913

#2b2afb is a balanced electric blue, 240° on the wheel and 83/100 on the cool side. Put white text on it (7.43:1). As text it scores 7.43:1 on white — safe at any size. Nearest name is Blue, nearest Tailwind family is indigo.

hsl(240 96% 58%)rgb(43 42 251)Base step 500AAA inkCool

At a glance

Every number on this page in one read: what #2b2afb is made of, how bright it looks, and which way it leans.

Hex
#2b2afb
Hue
240°
blue
Saturation
96%
electric
Lightness
58%
balanced
Brightness
98%
HSV value
Perceived
37%
weighted brightness
Luminance
0.0913
WCAG relative
Temperature
Cool
83/100 cool
Color family
Blue
Tone
Electric
Best ink
White
7.43:1
Closest name
Blue
ΔE2000 4
Chroma
120.3
LCH, 0–130ish
OKLCH L
0.480
perceptual lightness
Tailwind
indigo
500 · ΔE 14.9
Web-safe
#3333FF
nearest of 216
Where it sits
Hue240° of 360°
Saturation96%
Lightness58%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #2b2afb.

Temperature
Warm ← → Cool83% 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
Red6%
Green18%
Blue76%

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

Every format

HEX#2b2afb
HEX (8-digit)#2b2afbff
RGBrgb(43, 42, 251)
RGBArgba(43, 42, 251, 1)
HSLhsl(240, 96%, 58%)
HSV / HSBhsv(240, 83%, 98%)
HWBhwb(240 16% 2%)
CMYKcmyk(83%, 83%, 0%, 2%)
LABlab(36.2 68.4 -99.0)
LCHlch(36.2 120.3 304.6)
OKLCHoklch(0.480 0.287 268.8)
XYZ (D65)xyz(19.23, 9.13, 92.00)
Decimal2829051
Display P3color(display-p3 0.169 0.165 0.984)
Web-safe#3333FF

Copy-ready code

every platformclick to select
/* CSS */
color: #2b2afb;
background-color: #2b2afb;
/* CSS custom property */
--brand: #2b2afb;
/* Tailwind (arbitrary) */
class="text-[#2b2afb] bg-[#2b2afb]"
/* SCSS */
$brand: #2b2afb;
/* SwiftUI */
Color(red: 0.169, green: 0.165, blue: 0.984)
/* UIKit */
UIColor(red: 0.169, green: 0.165, blue: 0.984, alpha: 1)
/* Android XML */
<color name="brand">#2B2AFB</color>
/* Android Compose */
Color(0xFF2B2AFB)
/* Flutter */
Color(0xFF2B2AFB)
/* Python / OpenCV (BGR) */
(251, 42, 43)
/* Python / PIL (RGB) */
(43, 42, 251)
/* Java AWT */
new Color(43, 42, 251)
/* .NET */
Color.FromArgb(255, 43, 42, 251)
/* OpenGL / Unity (0–1) */
(0.1686f, 0.1647f, 0.9843f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{43,42,251}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #2b2afb 85%, white);
border-color: color-mix(in oklab, #2b2afb 40%, transparent);
/* theme-aware in one line */
color: light-dark(#03027D, #D3D3EE);
/* relative colour syntax */
--hover: hsl(from #2b2afb 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: #F1F1FD;
  --brand-100: #E4E4FC;
  --brand-200: #C2C1FA;
  --brand-300: #9191FD;
  --brand-400: #5B5AFC;
  --brand-500: #2b2afb;
  --brand-600: #0605F0;
  --brand-700: #0504C8;
  --brand-800: #0403A0;
  --brand-900: #080773;
  --brand-950: #050448;
  --brand: #2b2afb;
  --brand-ink: #ffffff;
  --brand-surface: #F4F4FA;
  --brand-border: #C0C0ED;
  --brand-hover: #0807FA;
  --brand-pressed: #0504DA;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #141424;
    --brand-ink: #D3D3EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F1F1FD',
        100: '#E4E4FC',
        200: '#C2C1FA',
        300: '#9191FD',
        400: '#5B5AFC',
        500: '#2b2afb',
        600: '#0605F0',
        700: '#0504C8',
        800: '#0403A0',
        900: '#080773',
        950: '#050448',
        DEFAULT: '#2b2afb',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F1F1FD,
  '100': #E4E4FC,
  '200': #C2C1FA,
  '300': #9191FD,
  '400': #5B5AFC,
  '500': #2b2afb,
  '600': #0605F0,
  '700': #0504C8,
  '800': #0403A0,
  '900': #080773,
  '950': #050448,
);
$brand-base: #2b2afb;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F1F1FD", "$type": "color" },
      "100": { "$value": "#E4E4FC", "$type": "color" },
      "200": { "$value": "#C2C1FA", "$type": "color" },
      "300": { "$value": "#9191FD", "$type": "color" },
      "400": { "$value": "#5B5AFC", "$type": "color" },
      "500": { "$value": "#2b2afb", "$type": "color" },
      "600": { "$value": "#0605F0", "$type": "color" },
      "700": { "$value": "#0504C8", "$type": "color" },
      "800": { "$value": "#0403A0", "$type": "color" },
      "900": { "$value": "#080773", "$type": "color" },
      "950": { "$value": "#050448", "$type": "color" }
    },
    "brandInk": { "$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 #2b2afb · 7.43:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 7.43:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 2.83:1
AA fail · AA large fail · AAA fail
Reading the other direction: #2b2afb as text scores 7.43:1 on white and 2.83:1 on black.
Best tinted ink on it, if plain black or white feels flat: #E6E6FF at 6.06:1.

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
#2b2afb · 7.43:1
AA on whitealready passes
#2b2afb
The quick fox
#2b2afb · 7.43:1
AAA on whitealready passes
#2b2afb
The quick fox
#6261FC · 4.63:1
AA on black+11% L
#6261FC
The quick fox
#8A89FD · 7.08:1
AAA on black+19% L
#8A89FD

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #2B2AFB 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
#2b2afb on white: 7.43:1
AA ✓ pass · AA-large · AAA
Aa
#2b2afb on black: 2.83:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #2b2afb as text on that neutral, and that neutral as text on #2b2afb.

NeutralRatioBoth directions
White7.43:1AaAa
Slate 507.10:1AaAa
Slate 1006.78:1AaAa
Slate 2006.03:1AaAa
Slate 3005.00:1AaAa
Slate 4002.90:1AaAa
Slate 5001.56:1AaAa
Slate 6001.02:1AaAa
Slate 7001.39:1AaAa
Slate 8001.97:1AaAa
Slate 9002.40:1AaAa
Black2.83:1AaAa
Colour vision deficiency
true color
protanopia · #0060FF
deuteranopia · #004AF8
tritanopia · #007097

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. #2b2afb is pinned to step 500; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F1F1FD
#E4E4FC
#C2C1FA
#9191FD
#5B5AFC
#2b2afb
#0605F0
#0504C8
#0403A0
#080773
#050448
Base = 500Lightest = 50 · #F1F1FDDarkest = 950 · #050448Text 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 0.072 268.8);
  --brand-100: oklch(0.94 0.115 268.8);
  --brand-200: oklch(0.88 0.172 268.8);
  --brand-300: oklch(0.80 0.224 268.8);
  --brand-400: oklch(0.72 0.264 268.8);
  --brand-500: oklch(0.64 0.287 268.8);
  --brand-600: oklch(0.56 0.287 268.8);
  --brand-700: oklch(0.48 0.269 268.8);
  --brand-800: oklch(0.40 0.241 268.8);
  --brand-900: oklch(0.32 0.201 268.8);
  --brand-950: oklch(0.24 0.158 268.8);
}

Colors that work with #2b2afb

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#C0C0ED
Hairlines and dividers
Muted text#4B4B9B
Captions on the surface
Accent#CC9A00
Second voice, not a rival
Dark variant#03027D
Hover, pressed, headers
Light variant#E6E6FF
Selected rows, tints
Dark surface#141424
Dark-mode background
Hover#0807FA
One step down in lightness
Pressed#0504DA
Two steps down
Disabled#BFBFD6
Chroma pulled out
Focus ring#3C3BFF
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 #2b2afb

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
  • Brand accents, badges and data highlights
  • Chart series and data categories
Use with care
  • Text on black or near-black surfaces
  • Full-page backgrounds — tiring over long sessions
  • 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 mid lightness keeps it versatile in both themes.

Worth knowing

It is also the most crowded hue on the web. Distinctiveness has to come from your other choices.

Reads as
  • FormalityLow
  • EnergyHigh
  • Weight43/100
  • 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#FAFB2A
Analogous left#2A92FB
Analogous right#942AFB
Split-complement 1#FB942A
Split-complement 2#92FB2A
Triadic 1#FB2B2A
Triadic 2#2AFB2B
Tetradic#FB2A92
On the wheel
Base+30°−30°+120°+240°+180°240°

#2b2afb sits at 240°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red16.9%
Green16.5%
Blue98.4%
R · 0–255
43
0x2b
G · 0–255
42
0x2a
B · 0–255
251
0xfb

CMYK percentages

Cyan82.9%
Magenta83.3%
Yellow0.0%
Key (black)1.6%

Total ink coverage is 168%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#2b2afb text on a black background

contrast 2.83:1

Card sample

#2b2afb text on a white background

contrast 7.43:1

Card sample

#2b2afb on grey

6.78:1

#2b2afb on its own surface

6.78:1

#2b2afb on its dark surface

2.45:1

CSS3 live lab

Text font color

The quick brown fox

color: #2b2afb;
Background color
Panel with #2b2afb background
background-color: #2b2afb;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #2b2afb;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(43, 42, 251, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(43, 42, 251, 0.45);
Border & gradient
Gradient panel
border: 3px solid #2b2afb;
background: linear-gradient(135deg, #2b2afb, #B62AFB);
Gradient text

Gradient headline

background: linear-gradient(90deg, #2b2afb, #EB2AFB);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #2b2afb;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #2b2afb;
caret-color: #2b2afb;
Left rule
Pull quote or callout
border-left: 4px solid #2b2afb;
Ring + tint
Selected chip
background: #E6E6FF;
box-shadow: inset 0 0 0 2px #2b2afb;
Conic badge
68%
background: conic-gradient(#2b2afb 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #2b2afb 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(43, 42, 251, 0.5)
rgb(43 42 251 / 50%)
#2b2afb80
hsl(240 96% 58% / 50%)
color-mix(in srgb, #2b2afb 50%, transparent)
Alpha8-digit hexFlat on white
10%#2b2afb1a#EAEAFF
20%#2b2afb33#D5D4FE
40%#2b2afb66#AAAAFD
60%#2b2afb99#807FFD
80%#2b2afbcc#5555FC

Gradients from #2b2afb

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, #6766FC, #2b2afb 45%, #03027D);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #2b2afb, #C00CFA);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #2b2afb, #FAFB2A);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #8584FD 0%, #2b2afb 45%, #03027D 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%, #5CB9FC 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #B248FC 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #03027D 0%, transparent 65%), #2b2afb;

Monochromatic scale

Palettes built from #2b2afb

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.

#2b2afb 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

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 2.83:1 — lift it to #6261FC 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.

#2b2afb, answered

What color is #2b2afb?

#2b2afb is a balanced electric blue, closest to Blue (ΔE2000 4). It sits at 240° on the hue wheel with 96% saturation and 58% lightness, which reads as cool.

What is the RGB value of #2b2afb?

rgb(43, 42, 251) — 43 red, 42 green and 251 blue out of 255, or 16.9% / 16.5% / 98.4% by channel.

What is #2b2afb in HSL and HSV?

hsl(240, 96%, 58%) and hsv(240, 83%, 98%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #2b2afb a light or a dark color?

It is a dark color. Relative luminance is 0.0913 and perceived brightness is 37%, so white text on it reaches 7.43:1.

Should I use black or white text on #2b2afb?

White. It scores 7.43:1 against #2b2afb, versus 2.83:1 for black — AAA at any size.

Is #2b2afb accessible on a white background?

#2b2afb on white scores 7.43:1, which clears AAA at every size.

What is the complementary color of #2b2afb?

#FAFB2A sits directly opposite on the wheel. Softer options are the split-complements #FB942A and #92FB2A, which give the same contrast with far less vibration.

What colors go well with #2b2afb?

For interface work: #F4F4FA as the surface, #C0C0ED for borders, #4B4B9B for secondary text, #CC9A00 as an accent and #03027D for hover and pressed states. For a palette, the analogous pair #2A92FB and #942AFB stays calm, while #FAFB2A is the loudest partner.

What is #2b2afb in CMYK for printing?

cmyk(83%, 83%, 0%, 2%). 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 #2b2afb warm or cool?

Cool — it scores 83 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #782AFB; nudged cooler, #2858FD.

Which Tailwind color is closest to #2b2afb?

The indigo family — its 500 step is #6366f1, ΔE2000 14.9 away. That is a visible difference, so define #2b2afb as a custom token rather than reaching for the built-in.

How do I use #2b2afb in Tailwind CSS?

Inline it as an arbitrary value with bg-[#2b2afb] or text-[#2b2afb], 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 #2b2afb with 50% opacity?

rgba(43, 42, 251, 0.5), or #2b2afb80 in eight-digit hex. Over white that composites to #9595FD; over black, #16157E.

Is #2b2afb a web-safe color?

No. The nearest web-safe colour is #3333FF, ΔE2000 1.9 away. The palette only matters for legacy displays and some email clients now.

What does the color #2b2afb 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 #2b2afb?

The safest is same-hue elevation: linear-gradient(135deg, #6766FC, #2b2afb 45%, #03027D). For more colour, a short hue run to #C00CFA keeps it rich without turning muddy.

Work with #2b2afb in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #2b2afb at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.