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blue · cool

#8366df

a balanced, vivid blue · cool · closest name: Medium Slate Blue

Token name suggestion: Atlas Denim

RGB
131, 102, 223
HSL
254°, 65%, 64%
CMYK
41, 54, 0, 13
Luminance
0.1966

#8366df is a balanced vivid blue, 254° on the wheel and 75/100 on the cool side. Put black text on it (4.93:1). As text it scores 4.26:1 on white — large text only. Nearest name is Medium Slate Blue, nearest Tailwind family is violet.

hsl(254 65% 64%)rgb(131 102 223)Base step 400AA inkCool

At a glance

Every number on this page in one read: what #8366df is made of, how bright it looks, and which way it leans.

Hex
#8366df
Hue
254°
blue
Saturation
65%
vivid
Lightness
64%
balanced
Brightness
87%
HSV value
Perceived
51%
weighted brightness
Luminance
0.1966
WCAG relative
Temperature
Cool
75/100 cool
Color family
Blue
Tone
Vivid
Best ink
Black
4.93:1
Closest name
Medium Slate Blue
ΔE2000 2.8
Chroma
70.3
LCH, 0–130ish
OKLCH L
0.598
perceptual lightness
Tailwind
violet
500 · ΔE 4
Web-safe
#9966CC
nearest of 216
Where it sits
Hue254° of 360°
Saturation65%
Lightness64%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #8366df.

Temperature
Warm ← → Cool75% 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
Red25%
Green48%
Blue27%

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

Every format

HEX#8366df
HEX (8-digit)#8366dfff
RGBrgb(131, 102, 223)
RGBArgba(131, 102, 223, 1)
HSLhsl(254, 65%, 64%)
HSV / HSBhsv(254, 54%, 87%)
HWBhwb(254 40% 13%)
CMYKcmyk(41%, 54%, 0%, 13%)
LABlab(51.4 39.7 -58.1)
LCHlch(51.4 70.3 304.4)
OKLCHoklch(0.598 0.177 291.1)
XYZ (D65)xyz(27.43, 19.65, 72.15)
Decimal8611551
Display P3color(display-p3 0.514 0.400 0.875)
Web-safe#9966CC

Copy-ready code

every platformclick to select
/* CSS */
color: #8366df;
background-color: #8366df;
/* CSS custom property */
--brand: #8366df;
/* Tailwind (arbitrary) */
class="text-[#8366df] bg-[#8366df]"
/* SCSS */
$brand: #8366df;
/* SwiftUI */
Color(red: 0.514, green: 0.400, blue: 0.875)
/* UIKit */
UIColor(red: 0.514, green: 0.400, blue: 0.875, alpha: 1)
/* Android XML */
<color name="brand">#8366DF</color>
/* Android Compose */
Color(0xFF8366DF)
/* Flutter */
Color(0xFF8366DF)
/* Python / OpenCV (BGR) */
(223, 102, 131)
/* Python / PIL (RGB) */
(131, 102, 223)
/* Java AWT */
new Color(131, 102, 223)
/* .NET */
Color.FromArgb(255, 131, 102, 223)
/* OpenGL / Unity (0–1) */
(0.5137f, 0.4000f, 0.8745f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{131,102,223}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #8366df 85%, white);
border-color: color-mix(in oklab, #8366df 40%, transparent);
/* theme-aware in one line */
color: light-dark(#2A1669, #D9D3EE);
/* relative colour syntax */
--hover: hsl(from #8366df 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: #F5F3FB;
  --brand-100: #ECE8F8;
  --brand-200: #D4CBF1;
  --brand-300: #B4A2EC;
  --brand-400: #8366df;
  --brand-500: #6945D8;
  --brand-600: #512ACA;
  --brand-700: #4323A9;
  --brand-800: #361C87;
  --brand-900: #2A1862;
  --brand-950: #1A0F3D;
  --brand: #8366df;
  --brand-ink: #000000;
  --brand-surface: #F6F4FA;
  --brand-border: #CBC0ED;
  --brand-hover: #6B48D9;
  --brand-pressed: #542CD2;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #181424;
    --brand-ink: #D9D3EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F5F3FB',
        100: '#ECE8F8',
        200: '#D4CBF1',
        300: '#B4A2EC',
        400: '#8366df',
        500: '#6945D8',
        600: '#512ACA',
        700: '#4323A9',
        800: '#361C87',
        900: '#2A1862',
        950: '#1A0F3D',
        DEFAULT: '#8366df',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F5F3FB,
  '100': #ECE8F8,
  '200': #D4CBF1,
  '300': #B4A2EC,
  '400': #8366df,
  '500': #6945D8,
  '600': #512ACA,
  '700': #4323A9,
  '800': #361C87,
  '900': #2A1862,
  '950': #1A0F3D,
);
$brand-base: #8366df;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F5F3FB", "$type": "color" },
      "100": { "$value": "#ECE8F8", "$type": "color" },
      "200": { "$value": "#D4CBF1", "$type": "color" },
      "300": { "$value": "#B4A2EC", "$type": "color" },
      "400": { "$value": "#8366df", "$type": "color" },
      "500": { "$value": "#6945D8", "$type": "color" },
      "600": { "$value": "#512ACA", "$type": "color" },
      "700": { "$value": "#4323A9", "$type": "color" },
      "800": { "$value": "#361C87", "$type": "color" },
      "900": { "$value": "#2A1862", "$type": "color" },
      "950": { "$value": "#1A0F3D", "$type": "color" }
    },
    "brandInk": { "$value": "#000000", "$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#000000 on #8366df · 4.93:1
Use #000000AA at every size, AAA for large text only.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 4.26:1
AA fail · AA large pass · AAA fail
Aa
Black text · 4.93:1 · recommended
AA pass · AA large pass · AAA fail
Reading the other direction: #8366df as text scores 4.26:1 on white and 4.93:1 on black.
Best tinted ink on it, if plain black or white feels flat: #2A1669 at 3.48:1.

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
#7C5DDD · 4.70:1
AA on white−2% L
#7C5DDD
The quick fox
#5D38D5 · 7.02:1
AAA on white−11% L
#5D38D5
The quick fox
#8366df · 4.93:1
AA on blackalready passes
#8366df
The quick fox
#9E88E6 · 7.12:1
AAA on black+8% L
#9E88E6

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #8366DF 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
#8366df on white: 4.26:1
AA ✗ fail · AA-large · AAA
Aa
#8366df on black: 4.93:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #8366df as text on that neutral, and that neutral as text on #8366df.

NeutralRatioBoth directions
White4.26:1AaAa
Slate 504.07:1AaAa
Slate 1003.89:1AaAa
Slate 2003.45:1AaAa
Slate 3002.87:1AaAa
Slate 4001.66:1AaAa
Slate 5001.12:1AaAa
Slate 6001.78:1AaAa
Slate 7002.43:1AaAa
Slate 8003.44:1AaAa
Slate 9004.19:1AaAa
Black4.93:1AaAa
Colour vision deficiency
true color
protanopia · #2A7DE3
deuteranopia · #3078DC
tritanopia · #6A8099

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. #8366df is pinned to step 400; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F5F3FB
#ECE8F8
#D4CBF1
#B4A2EC
#8366df
#6945D8
#512ACA
#4323A9
#361C87
#2A1862
#1A0F3D
Base = 400Lightest = 50 · #F5F3FBDarkest = 950 · #1A0F3DText 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 0.044 291.1);
  --brand-100: oklch(0.94 0.071 291.1);
  --brand-200: oklch(0.88 0.106 291.1);
  --brand-300: oklch(0.80 0.138 291.1);
  --brand-400: oklch(0.72 0.163 291.1);
  --brand-500: oklch(0.64 0.177 291.1);
  --brand-600: oklch(0.56 0.177 291.1);
  --brand-700: oklch(0.48 0.166 291.1);
  --brand-800: oklch(0.40 0.149 291.1);
  --brand-900: oklch(0.32 0.124 291.1);
  --brand-950: oklch(0.24 0.097 291.1);
}

Colors that work with #8366df

Not a palette — a role sheet. Each swatch answers one question you will hit while building the component.

Text on it#000000
Black wins here
Surface#F6F4FA
Tinted page background
Border#CBC0ED
Hairlines and dividers
Muted text#5E4B9B
Captions on the surface
Accent#ADAB1F
Second voice, not a rival
Dark variant#2A1669
Hover, pressed, headers
Light variant#EEEAFB
Selected rows, tints
Dark surface#181424
Dark-mode background
Hover#6B48D9
One step down in lightness
Pressed#542CD2
Two steps down
Disabled#D6D3E3
Chroma pulled out
Focus ring#8C6FEB
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 #8366df

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

Works well for
  • Headings from 24px up on white
  • Text and icons on dark surfaces
  • 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
  • Small text on white — under 4.5:1
  • Full-page backgrounds — tiring over long sessions
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
24px / 18.66px bold
Safe as a fill behind white type
No — use #2A1669
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.

This is a confident chroma: strong enough to lead a brand, restrained enough to live in an interface all day. 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
  • FormalityMedium
  • EnergyMedium-high
  • Weight36/100
  • 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#C2DF66
Analogous left#6685DF
Analogous right#BF66DF
Split-complement 1#DFBF66
Split-complement 2#85DF66
Triadic 1#DF8366
Triadic 2#66DF83
Tetradic#DF6685
On the wheel
Base+30°−30°+120°+240°+180°254°

#8366df sits at 254°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red51.4%
Green40.0%
Blue87.5%
R · 0–255
131
0x83
G · 0–255
102
0x66
B · 0–255
223
0xdf

CMYK percentages

Cyan41.3%
Magenta54.3%
Yellow0.0%
Key (black)12.5%

Total ink coverage is 108%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#8366df text on a black background

contrast 4.93:1

Card sample

#8366df text on a white background

contrast 4.26:1

Card sample

#8366df on grey

3.89:1

#8366df on its own surface

3.90:1

#8366df on its dark surface

4.24:1

CSS3 live lab

Text font color

The quick brown fox

color: #8366df;
Background color
Panel with #8366df background
background-color: #8366df;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #8366df;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(131, 102, 223, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(131, 102, 223, 0.45);
Border & gradient
Gradient panel
border: 3px solid #8366df;
background: linear-gradient(135deg, #8366df, #D466DF);
Gradient text

Gradient headline

background: linear-gradient(90deg, #8366df, #DF66CC);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #8366df;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #8366df;
caret-color: #8366df;
Left rule
Pull quote or callout
border-left: 4px solid #8366df;
Ring + tint
Selected chip
background: #EEEAFB;
box-shadow: inset 0 0 0 2px #8366df;
Conic badge
68%
background: conic-gradient(#8366df 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #8366df 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(131, 102, 223, 0.5)
rgb(131 102 223 / 50%)
#8366df80
hsl(254 65% 64% / 50%)
color-mix(in srgb, #8366df 50%, transparent)
Alpha8-digit hexFlat on white
10%#8366df1a#F3F0FC
20%#8366df33#E6E0F9
40%#8366df66#CDC2F2
60%#8366df99#B5A3EC
80%#8366dfcc#9C85E5

Gradients from #8366df

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, #AC99EA, #8366df 45%, #2A1669);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #8366df, #D84DDA);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #8366df, #C2DF66);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #C0B2EF 0%, #8366df 45%, #2A1669 100%);
Soft wash
Section backgrounds that stay readable
background: linear-gradient(180deg, #F6F4FA, #ffffff);
Mesh
Ambient background, no image weight
background: radial-gradient(60% 60% at 15% 20%, #90AEE8 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #D27FE4 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #2A1669 0%, transparent 65%), #8366df;

Monochromatic scale

Palettes built from #8366df

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.

#8366df 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

Usable as-is on a dark surface at 4.93:1.

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.

#8366df, answered

What color is #8366df?

#8366df is a balanced vivid blue, closest to Medium Slate Blue (ΔE2000 2.8). It sits at 254° on the hue wheel with 65% saturation and 64% lightness, which reads as cool.

What is the RGB value of #8366df?

rgb(131, 102, 223) — 131 red, 102 green and 223 blue out of 255, or 51.4% / 40% / 87.5% by channel.

What is #8366df in HSL and HSV?

hsl(254, 65%, 64%) and hsv(254, 54%, 87%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #8366df a light or a dark color?

It is a mid-tone. Relative luminance is 0.1966 and perceived brightness is 51%, so black text on it reaches 4.93:1.

Should I use black or white text on #8366df?

Black. It scores 4.93:1 against #8366df, versus 4.26:1 for white — AA at any size.

Is #8366df accessible on a white background?

#8366df on white scores 4.26:1, which only clears AA for large text — 18.66px bold or 24px regular and up. Darken it to #7C5DDD to reach 4.5:1, or #5D38D5 for 7:1.

What is the complementary color of #8366df?

#C2DF66 sits directly opposite on the wheel. Softer options are the split-complements #DFBF66 and #85DF66, which give the same contrast with far less vibration.

What colors go well with #8366df?

For interface work: #F6F4FA as the surface, #CBC0ED for borders, #5E4B9B for secondary text, #ADAB1F as an accent and #2A1669 for hover and pressed states. For a palette, the analogous pair #6685DF and #BF66DF stays calm, while #C2DF66 is the loudest partner.

What is #8366df in CMYK for printing?

cmyk(41%, 54%, 0%, 13%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #8366df warm or cool?

Cool — it scores 75 on a scale where 0 is the warmest orange and 100 the coolest azure. Nudged warmer it becomes #AF66DF; nudged cooler, #6474E1.

Which Tailwind color is closest to #8366df?

The violet family — its 500 step is #8b5cf6, ΔE2000 4 away. That is a visible difference, so define #8366df as a custom token rather than reaching for the built-in.

How do I use #8366df in Tailwind CSS?

Inline it as an arbitrary value with bg-[#8366df] or text-[#8366df], 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 #8366df with 50% opacity?

rgba(131, 102, 223, 0.5), or #8366df80 in eight-digit hex. Over white that composites to #C1B3EF; over black, #423370.

Is #8366df a web-safe color?

No. The nearest web-safe colour is #9966CC, ΔE2000 6.1 away. The palette only matters for legacy displays and some email clients now.

What does the color #8366df 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 #8366df?

The safest is same-hue elevation: linear-gradient(135deg, #AC99EA, #8366df 45%, #2A1669). For more colour, a short hue run to #D84DDA keeps it rich without turning muddy.

Work with #8366df in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #8366df at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.