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violet · cool

#402a66

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

Token name suggestion: Forest Thistle

RGB
64, 42, 102
HSL
262°, 42%, 28%
CMYK
37, 59, 0, 60
Luminance
0.0371

#402a66 is a dark soft violet, 262° on the wheel and 71/100 on the cool side. Put white text on it (12.06:1). As text it scores 12.06:1 on white — safe at any size. Nearest name is Dark Slate Blue, nearest Tailwind family is slate.

hsl(262 42% 28%)rgb(64 42 102)Base step 800AAA inkCool

At a glance

Every number on this page in one read: what #402a66 is made of, how bright it looks, and which way it leans.

Hex
#402a66
Hue
262°
violet
Saturation
42%
soft
Lightness
28%
dark
Brightness
40%
HSV value
Perceived
23%
weighted brightness
Luminance
0.0371
WCAG relative
Temperature
Cool
71/100 cool
Color family
Violet
Tone
Soft
Best ink
White
12.06:1
Closest name
Dark Slate Blue
ΔE2000 8
Chroma
40.3
LCH, 0–130ish
OKLCH L
0.344
perceptual lightness
Tailwind
slate
500 · ΔE 24.9
Web-safe
#333366
nearest of 216
Where it sits
Hue262° of 360°
Saturation42%
Lightness28%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #402a66.

Temperature
Warm ← → Cool71% 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
Red29%
Green45%
Blue26%

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

Every format

HEX#402a66
HEX (8-digit)#402a66ff
RGBrgb(64, 42, 102)
RGBArgba(64, 42, 102, 1)
HSLhsl(262, 42%, 28%)
HSV / HSBhsv(262, 59%, 40%)
HWBhwb(262 16% 60%)
CMYKcmyk(37%, 59%, 0%, 60%)
LABlab(22.7 24.8 -31.8)
LCHlch(22.7 40.3 308.0)
OKLCHoklch(0.344 0.102 297.7)
XYZ (D65)xyz(5.34, 3.71, 13.00)
Decimal4205158
Display P3color(display-p3 0.251 0.165 0.400)
Web-safe#333366

Copy-ready code

every platformclick to select
/* CSS */
color: #402a66;
background-color: #402a66;
/* CSS custom property */
--brand: #402a66;
/* Tailwind (arbitrary) */
class="text-[#402a66] bg-[#402a66]"
/* SCSS */
$brand: #402a66;
/* SwiftUI */
Color(red: 0.251, green: 0.165, blue: 0.400)
/* UIKit */
UIColor(red: 0.251, green: 0.165, blue: 0.400, alpha: 1)
/* Android XML */
<color name="brand">#402A66</color>
/* Android Compose */
Color(0xFF402A66)
/* Flutter */
Color(0xFF402A66)
/* Python / OpenCV (BGR) */
(102, 42, 64)
/* Python / PIL (RGB) */
(64, 42, 102)
/* Java AWT */
new Color(64, 42, 102)
/* .NET */
Color.FromArgb(255, 64, 42, 102)
/* OpenGL / Unity (0–1) */
(0.2510f, 0.1647f, 0.4000f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{64,42,102}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #402a66 85%, white);
border-color: color-mix(in oklab, #402a66 40%, transparent);
/* theme-aware in one line */
color: light-dark(#39255A, #DDD4ED);
/* relative colour syntax */
--hover: hsl(from #402a66 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: #F7F5FA;
  --brand-100: #EEEBF5;
  --brand-200: #DBD2EA;
  --brand-300: #C1B0DE;
  --brand-400: #A188CE;
  --brand-500: #8260BE;
  --brand-600: #6D47AD;
  --brand-700: #5B3B91;
  --brand-800: #402a66;
  --brand-900: #372655;
  --brand-950: #221835;
  --brand: #402a66;
  --brand-ink: #ffffff;
  --brand-surface: #F7F4FA;
  --brand-border: #D2C5E7;
  --brand-hover: #30204D;
  --brand-pressed: #201533;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #1A1424;
    --brand-ink: #DDD4ED;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F7F5FA',
        100: '#EEEBF5',
        200: '#DBD2EA',
        300: '#C1B0DE',
        400: '#A188CE',
        500: '#8260BE',
        600: '#6D47AD',
        700: '#5B3B91',
        800: '#402a66',
        900: '#372655',
        950: '#221835',
        DEFAULT: '#402a66',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F7F5FA,
  '100': #EEEBF5,
  '200': #DBD2EA,
  '300': #C1B0DE,
  '400': #A188CE,
  '500': #8260BE,
  '600': #6D47AD,
  '700': #5B3B91,
  '800': #402a66,
  '900': #372655,
  '950': #221835,
);
$brand-base: #402a66;
$brand-ink: #ffffff;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F7F5FA", "$type": "color" },
      "100": { "$value": "#EEEBF5", "$type": "color" },
      "200": { "$value": "#DBD2EA", "$type": "color" },
      "300": { "$value": "#C1B0DE", "$type": "color" },
      "400": { "$value": "#A188CE", "$type": "color" },
      "500": { "$value": "#8260BE", "$type": "color" },
      "600": { "$value": "#6D47AD", "$type": "color" },
      "700": { "$value": "#5B3B91", "$type": "color" },
      "800": { "$value": "#402a66", "$type": "color" },
      "900": { "$value": "#372655", "$type": "color" },
      "950": { "$value": "#221835", "$type": "color" }
    },
    "brandInk": { "$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 #402a66 · 12.06:1
Use #ffffffAAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 12.06:1 · recommended
AA pass · AA large pass · AAA pass
Aa
Black text · 1.74:1
AA fail · AA large fail · AAA fail
Reading the other direction: #402a66 as text scores 12.06:1 on white and 1.74:1 on black.
Best tinted ink on it, if plain black or white feels flat: #F1EDF8 at 10.46:1.

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
#402a66 · 12.06:1
AA on whitealready passes
#402a66
The quick fox
#402a66 · 12.06:1
AAA on whitealready passes
#402a66
The quick fox
#8664BF · 4.59:1
AA on black+29% L
#8664BF
The quick fox
#A58CD0 · 7.26:1
AAA on black+40% L
#A58CD0

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #402A66 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
#402a66 on white: 12.06:1
AA ✓ pass · AA-large · AAA
Aa
#402a66 on black: 1.74:1
AA ✗ fail · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #402a66 as text on that neutral, and that neutral as text on #402a66.

NeutralRatioBoth directions
White12.06:1AaAa
Slate 5011.53:1AaAa
Slate 10011.01:1AaAa
Slate 2009.78:1AaAa
Slate 3008.12:1AaAa
Slate 4004.70:1AaAa
Slate 5002.53:1AaAa
Slate 6001.59:1AaAa
Slate 7001.16:1AaAa
Slate 8001.21:1AaAa
Slate 9001.48:1AaAa
Black1.74:1AaAa
Colour vision deficiency
true color
protanopia · #0F3668
deuteranopia · #173565
tritanopia · #373643

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. #402a66 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.

#F7F5FA
#EEEBF5
#DBD2EA
#C1B0DE
#A188CE
#8260BE
#6D47AD
#5B3B91
#402a66
#372655
#221835
Base = 800Lightest = 50 · #F7F5FADarkest = 950 · #221835Text 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 0.025 297.7);
  --brand-100: oklch(0.94 0.041 297.7);
  --brand-200: oklch(0.88 0.061 297.7);
  --brand-300: oklch(0.80 0.079 297.7);
  --brand-400: oklch(0.72 0.094 297.7);
  --brand-500: oklch(0.64 0.102 297.7);
  --brand-600: oklch(0.56 0.102 297.7);
  --brand-700: oklch(0.48 0.096 297.7);
  --brand-800: oklch(0.40 0.086 297.7);
  --brand-900: oklch(0.32 0.071 297.7);
  --brand-950: oklch(0.24 0.056 297.7);
}

Colors that work with #402a66

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#F7F4FA
Tinted page background
Border#D2C5E7
Hairlines and dividers
Muted text#684B9B
Captions on the surface
Accent#616927
Second voice, not a rival
Dark variant#39255A
Hover, pressed, headers
Light variant#F1EDF8
Selected rows, tints
Dark surface#1A1424
Dark-mode background
Hover#30204D
One step down in lightness
Pressed#201533
Two steps down
Disabled#79649C
Chroma pulled out
Focus ring#47287D
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 #402a66

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.

creativepremiummodernimaginative

Violet sits between the warmth of red and the calm of blue, so it reads as inventive without reading as risky. Current shorthand for software craft.

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

Deep violets swallow detail on screens with poor gamma; check it on a cheap laptop panel.

Reads as
  • FormalityHigh
  • EnergyMedium
  • Weight72/100
  • 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#50662A
Analogous left#2A3266
Analogous right#5E2A66
Split-complement 1#665E2A
Split-complement 2#32662A
Triadic 1#66402A
Triadic 2#2A6640
Tetradic#662A32
On the wheel
Base+30°−30°+120°+240°+180°262°

#402a66 sits at 262°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red25.1%
Green16.5%
Blue40.0%
R · 0–255
64
0x40
G · 0–255
42
0x2a
B · 0–255
102
0x66

CMYK percentages

Cyan37.3%
Magenta58.8%
Yellow0.0%
Key (black)60.0%

Total ink coverage is 156%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#402a66 text on a black background

contrast 1.74:1

Card sample

#402a66 text on a white background

contrast 12.06:1

Card sample

#402a66 on grey

11.01:1

#402a66 on its own surface

11.07:1

#402a66 on its dark surface

1.49:1

CSS3 live lab

Text font color

The quick brown fox

color: #402a66;
Background color
Panel with #402a66 background
background-color: #402a66;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #402a66;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(64, 42, 102, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(64, 42, 102, 0.45);
Border & gradient
Gradient panel
border: 3px solid #402a66;
background: linear-gradient(135deg, #402a66, #662A64);
Gradient text

Gradient headline

background: linear-gradient(90deg, #402a66, #662A55);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #402a66;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #402a66;
caret-color: #402a66;
Left rule
Pull quote or callout
border-left: 4px solid #402a66;
Ring + tint
Selected chip
background: #F1EDF8;
box-shadow: inset 0 0 0 2px #402a66;
Conic badge
68%
background: conic-gradient(#402a66 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #402a66 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(64, 42, 102, 0.5)
rgb(64 42 102 / 50%)
#402a6680
hsl(262 42% 28% / 50%)
color-mix(in srgb, #402a66 50%, transparent)
Alpha8-digit hexFlat on white
10%#402a661a#ECEAF0
20%#402a6633#D9D4E0
40%#402a6666#B3AAC2
60%#402a6699#8C7FA3
80%#402a66cc#665585

Gradients from #402a66

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, #5B3C91, #402a66 45%, #39255A);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #402a66, #50214B);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #402a66, #50662A);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #6945A7 0%, #402a66 45%, #39255A 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F7F4FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #394A8A 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #78337C 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #39255A 0%, transparent 65%), #402a66;

Monochromatic scale

Palettes built from #402a66

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.

#402a66 in the real world

Where a color in this family tends to land, and the interface roles it is usually asked to play.

Industries
Creative toolsFintechBeautyLuxury
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 1.74:1 — lift it to #8664BF 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.

#402a66, answered

What color is #402a66?

#402a66 is a dark soft violet, closest to Dark Slate Blue (ΔE2000 8). It sits at 262° on the hue wheel with 42% saturation and 28% lightness, which reads as cool.

What is the RGB value of #402a66?

rgb(64, 42, 102) — 64 red, 42 green and 102 blue out of 255, or 25.1% / 16.5% / 40% by channel.

What is #402a66 in HSL and HSV?

hsl(262, 42%, 28%) and hsv(262, 59%, 40%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #402a66 a light or a dark color?

It is a dark color. Relative luminance is 0.0371 and perceived brightness is 23%, so white text on it reaches 12.06:1.

Should I use black or white text on #402a66?

White. It scores 12.06:1 against #402a66, versus 1.74:1 for black — AAA at any size.

Is #402a66 accessible on a white background?

#402a66 on white scores 12.06:1, which clears AAA at every size.

What is the complementary color of #402a66?

#50662A sits directly opposite on the wheel. Softer options are the split-complements #665E2A and #32662A, which give the same contrast with far less vibration.

What colors go well with #402a66?

For interface work: #F7F4FA as the surface, #D2C5E7 for borders, #684B9B for secondary text, #616927 as an accent and #39255A for hover and pressed states. For a palette, the analogous pair #2A3266 and #5E2A66 stays calm, while #50662A is the loudest partner.

What is #402a66 in CMYK for printing?

cmyk(37%, 59%, 0%, 60%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #402a66 warm or cool?

Cool — it scores 71 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #562A66; nudged cooler, #282867.

Which Tailwind color is closest to #402a66?

The slate family — its 500 step is #64748b, ΔE2000 24.9 away. That is a visible difference, so define #402a66 as a custom token rather than reaching for the built-in.

How do I use #402a66 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#402a66] or text-[#402a66], 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 #402a66 with 50% opacity?

rgba(64, 42, 102, 0.5), or #402a6680 in eight-digit hex. Over white that composites to #A095B3; over black, #201533.

Is #402a66 a web-safe color?

No. The nearest web-safe colour is #333366, ΔE2000 5.5 away. The palette only matters for legacy displays and some email clients now.

What does the color #402a66 mean?

As a violet, it reads creative, premium, modern. Violet sits between the warmth of red and the calm of blue, so it reads as inventive without reading as risky. Current shorthand for software craft. At this moderate chroma the association is present but not shouted.

What gradient works with #402a66?

The safest is same-hue elevation: linear-gradient(135deg, #5B3C91, #402a66 45%, #39255A). For more colour, a short hue run to #50214B keeps it rich without turning muddy.

Work with #402a66 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #402a66 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.