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blue · cool

#aaace8

a light, vivid blue · cool · closest name: Light Steel Blue

Token name suggestion: Morning Harbour

RGB
170, 172, 232
HSL
238°, 57%, 79%
CMYK
27, 26, 0, 9
Luminance
0.4388

#aaace8 is a light vivid blue, 238° on the wheel and 84/100 on the cool side. Put black text on it (9.78:1). As text it scores 2.15:1 on white — use #6669D6 instead. Nearest name is Light Steel Blue, nearest Tailwind family is blue.

hsl(238 57% 79%)rgb(170 172 232)Base step 300AAA inkCool

At a glance

Every number on this page in one read: what #aaace8 is made of, how bright it looks, and which way it leans.

Hex
#aaace8
Hue
238°
blue
Saturation
57%
vivid
Lightness
79%
light
Brightness
91%
HSV value
Perceived
70%
weighted brightness
Luminance
0.4388
WCAG relative
Temperature
Cool
84/100 cool
Color family
Blue
Tone
Vivid
Best ink
Black
9.78:1
Closest name
Light Steel Blue
ΔE2000 10.1
Chroma
32.7
LCH, 0–130ish
OKLCH L
0.764
perceptual lightness
Tailwind
blue
500 · ΔE 19.6
Web-safe
#9999FF
nearest of 216
Where it sits
Hue238° of 360°
Saturation57%
Lightness79%
Saturation × lightness field

Left edge is grey, right edge is full chroma; top is white, bottom is black. The dot is #aaace8.

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
Red19%
Green67%
Blue13%

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

Every format

HEX#aaace8
HEX (8-digit)#aaace8ff
RGBrgb(170, 172, 232)
RGBArgba(170, 172, 232, 1)
HSLhsl(238, 57%, 79%)
HSV / HSBhsv(238, 27%, 91%)
HWBhwb(238 67% 9%)
CMYKcmyk(27%, 26%, 0%, 9%)
LABlab(72.2 12.3 -30.3)
LCHlch(72.2 32.7 292.1)
OKLCHoklch(0.764 0.086 282.7)
XYZ (D65)xyz(45.89, 43.88, 82.38)
Decimal11185384
Display P3color(display-p3 0.667 0.675 0.910)
Web-safe#9999FF

Copy-ready code

every platformclick to select
/* CSS */
color: #aaace8;
background-color: #aaace8;
/* CSS custom property */
--brand: #aaace8;
/* Tailwind (arbitrary) */
class="text-[#aaace8] bg-[#aaace8]"
/* SCSS */
$brand: #aaace8;
/* SwiftUI */
Color(red: 0.667, green: 0.675, blue: 0.910)
/* UIKit */
UIColor(red: 0.667, green: 0.675, blue: 0.910, alpha: 1)
/* Android XML */
<color name="brand">#AAACE8</color>
/* Android Compose */
Color(0xFFAAACE8)
/* Flutter */
Color(0xFFAAACE8)
/* Python / OpenCV (BGR) */
(232, 172, 170)
/* Python / PIL (RGB) */
(170, 172, 232)
/* Java AWT */
new Color(170, 172, 232)
/* .NET */
Color.FromArgb(255, 170, 172, 232)
/* OpenGL / Unity (0–1) */
(0.6667f, 0.6745f, 0.9098f, 1f)
/* LaTeX */
\definecolor{brand}{RGB}{170,172,232}
modern cssclick to select
/* mix without leaving CSS */
background: color-mix(in oklab, #aaace8 85%, white);
border-color: color-mix(in oklab, #aaace8 40%, transparent);
/* theme-aware in one line */
color: light-dark(#1B1D64, #D3D4EE);
/* relative colour syntax */
--hover: hsl(from #aaace8 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: #F4F4FB;
  --brand-100: #E9E9F7;
  --brand-200: #CDCEEF;
  --brand-300: #aaace8;
  --brand-400: #7B7EDB;
  --brand-500: #4E52CF;
  --brand-600: #3439C1;
  --brand-700: #2B2FA1;
  --brand-800: #232680;
  --brand-900: #1D1F5E;
  --brand-950: #12133A;
  --brand: #aaace8;
  --brand-ink: #000000;
  --brand-surface: #F4F4FA;
  --brand-border: #C0C1ED;
  --brand-hover: #8E90E0;
  --brand-pressed: #7275D9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --brand-surface: #141424;
    --brand-ink: #D3D4EE;
  }
}
tailwind.config.jsclick to select
theme: {
  extend: {
    colors: {
      brand: {
        50: '#F4F4FB',
        100: '#E9E9F7',
        200: '#CDCEEF',
        300: '#aaace8',
        400: '#7B7EDB',
        500: '#4E52CF',
        600: '#3439C1',
        700: '#2B2FA1',
        800: '#232680',
        900: '#1D1F5E',
        950: '#12133A',
        DEFAULT: '#aaace8',
      },
    },
  },
}
scss mapclick to select
$brand: (
  '50': #F4F4FB,
  '100': #E9E9F7,
  '200': #CDCEEF,
  '300': #aaace8,
  '400': #7B7EDB,
  '500': #4E52CF,
  '600': #3439C1,
  '700': #2B2FA1,
  '800': #232680,
  '900': #1D1F5E,
  '950': #12133A,
);
$brand-base: #aaace8;
$brand-ink: #000000;

@function brand($step) { @return map-get($brand, $step); }
w3c design tokens (json)click to select
{
  "color": {
    "brand": {
      "50": { "$value": "#F4F4FB", "$type": "color" },
      "100": { "$value": "#E9E9F7", "$type": "color" },
      "200": { "$value": "#CDCEEF", "$type": "color" },
      "300": { "$value": "#aaace8", "$type": "color" },
      "400": { "$value": "#7B7EDB", "$type": "color" },
      "500": { "$value": "#4E52CF", "$type": "color" },
      "600": { "$value": "#3439C1", "$type": "color" },
      "700": { "$value": "#2B2FA1", "$type": "color" },
      "800": { "$value": "#232680", "$type": "color" },
      "900": { "$value": "#1D1F5E", "$type": "color" },
      "950": { "$value": "#12133A", "$type": "color" }
    },
    "brandInk": { "$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 #aaace8 · 9.78:1
Use #000000AAA at every size.
Aa
12px
Aa
16px
Aa
24px
Aa
White text · 2.15:1
AA fail · AA large fail · AAA fail
Aa
Black text · 9.78:1 · recommended
AA pass · AA large pass · AAA pass
Reading the other direction: #aaace8 as text scores 2.15:1 on white and 9.78:1 on black.
Best tinted ink on it, if plain black or white feels flat: #1B1D64 at 6.95:1.

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
#6669D6 · 4.61:1
AA on white−17% L
#6669D6
The quick fox
#4246CC · 7.05:1
AAA on white−26% L
#4246CC
The quick fox
#aaace8 · 9.78:1
AA on blackalready passes
#aaace8
The quick fox
#aaace8 · 9.78:1
AAA on blackalready passes
#aaace8

Large text — 24px regular or 18.66px bold and above — only needs 3:1, so #8A8DDF 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
#aaace8 on white: 2.15:1
AA ✗ fail · AA-large · AAA
Aa
#aaace8 on black: 9.78:1
AA ✓ pass · AA-large · AAA
Against the neutral ladder

Contrast is symmetric, so each row covers both directions: #aaace8 as text on that neutral, and that neutral as text on #aaace8.

NeutralRatioBoth directions
White2.15:1AaAa
Slate 502.05:1AaAa
Slate 1001.96:1AaAa
Slate 2001.74:1AaAa
Slate 3001.45:1AaAa
Slate 4001.19:1AaAa
Slate 5002.22:1AaAa
Slate 6003.53:1AaAa
Slate 7004.82:1AaAa
Slate 8006.81:1AaAa
Slate 9008.31:1AaAa
Black9.78:1AaAa
Colour vision deficiency
true color
protanopia · #9CB3EB
deuteranopia · #99AFE6
tritanopia · #9BB7C1

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. #aaace8 is pinned to step 300; the rest hold its hue and let saturation ease off at the extremes so the pale end never turns neon.

#F4F4FB
#E9E9F7
#CDCEEF
#aaace8
#7B7EDB
#4E52CF
#3439C1
#2B2FA1
#232680
#1D1F5E
#12133A
Base = 300Lightest = 50 · #F4F4FBDarkest = 950 · #12133AText 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 0.021 282.7);
  --brand-100: oklch(0.94 0.034 282.7);
  --brand-200: oklch(0.88 0.051 282.7);
  --brand-300: oklch(0.80 0.067 282.7);
  --brand-400: oklch(0.72 0.079 282.7);
  --brand-500: oklch(0.64 0.086 282.7);
  --brand-600: oklch(0.56 0.086 282.7);
  --brand-700: oklch(0.48 0.080 282.7);
  --brand-800: oklch(0.40 0.072 282.7);
  --brand-900: oklch(0.32 0.060 282.7);
  --brand-950: oklch(0.24 0.047 282.7);
}

Colors that work with #aaace8

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#F4F4FA
Tinted page background
Border#C0C1ED
Hairlines and dividers
Muted text#4B4D9B
Captions on the surface
Accent#A48028
Second voice, not a rival
Dark variant#1B1D64
Hover, pressed, headers
Light variant#EBEBFA
Selected rows, tints
Dark surface#141424
Dark-mode background
Hover#8E90E0
One step down in lightness
Pressed#7275D9
Two steps down
Disabled#F3F3F7
Chroma pulled out
Focus ring#B6B7F1
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 #aaace8

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

Works well for
  • Text and icons on dark surfaces
  • Primary buttons and calls to action
  • Focus rings, active and selected states
  • Card and section backgrounds
  • Brand accents, badges and data highlights
Use with care
  • Text of any size on white — fails WCAG AA
  • Full-page backgrounds — tiring over long sessions
  • White text placed on it
  • Pairing with a same-lightness hue — edges vibrate
Minimum size as text on white
Not as text
Safe as a fill behind white type
No — use #1B1D64
Safe as a 1px border on white
No — use #8A8DDF

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 lightness keeps it airy and approachable.

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
  • Weight21/100
  • 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#E8E6AA
Analogous left#AACBE8
Analogous right#C7AAE8
Split-complement 1#E8C7AA
Split-complement 2#CBE8AA
Triadic 1#E8AAAC
Triadic 2#ACE8AA
Tetradic#E8AACB
On the wheel
Base+30°−30°+120°+240°+180°238°

#aaace8 sits at 238°. Every dot is a harmony position and links to its own page in the table alongside.

RGB percentages

Red66.7%
Green67.5%
Blue91.0%
R · 0–255
170
0xaa
G · 0–255
172
0xac
B · 0–255
232
0xe8

CMYK percentages

Cyan26.7%
Magenta25.9%
Yellow0.0%
Key (black)9.0%

Total ink coverage is 62%. Most commercial presses cap around 300% — above that, sheets stop drying properly.

Color previews

#aaace8 text on a black background

contrast 9.78:1

Card sample

#aaace8 text on a white background

contrast 2.15:1

Card sample

#aaace8 on grey

1.96:1

#aaace8 on its own surface

1.96:1

#aaace8 on its dark surface

8.46:1

CSS3 live lab

Text font color

The quick brown fox

color: #aaace8;
Background color
Panel with #aaace8 background
background-color: #aaace8;
Text shadow — hex

Glowing headline

text-shadow: 2px 2px 8px #aaace8;
Text shadow — RGB

Soft neon halo

text-shadow: 0 0 14px rgba(170, 172, 232, 0.45);
Div box shadow
Elevated card
box-shadow: 0 12px 32px -8px rgba(170, 172, 232, 0.45);
Border & gradient
Gradient panel
border: 3px solid #aaace8;
background: linear-gradient(135deg, #aaace8, #D1AAE8);
Gradient text

Gradient headline

background: linear-gradient(90deg, #aaace8, #E1AAE8);
-webkit-background-clip: text;
color: transparent;
Focus ring
Focused control
outline: 2px solid #aaace8;
outline-offset: 3px;
Underline & caret

Marked up text

text-decoration-color: #aaace8;
caret-color: #aaace8;
Left rule
Pull quote or callout
border-left: 4px solid #aaace8;
Ring + tint
Selected chip
background: #EBEBFA;
box-shadow: inset 0 0 0 2px #aaace8;
Conic badge
68%
background: conic-gradient(#aaace8 68%, #e2e8f0 0);

Transparency

What each alpha value actually composites to. The top row is #aaace8 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(170, 172, 232, 0.5)
rgb(170 172 232 / 50%)
#aaace880
hsl(238 57% 79% / 50%)
color-mix(in srgb, #aaace8 50%, transparent)
Alpha8-digit hexFlat on white
10%#aaace81a#F7F7FD
20%#aaace833#EEEEFA
40%#aaace866#DDDEF6
60%#aaace899#CCCDF1
80%#aaace8cc#BBBDED

Gradients from #aaace8

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, #DADBF5, #aaace8 45%, #1B1D64);
Duotone
A short hue run reads richer than a flat fill
background: linear-gradient(120deg, #aaace8, #CB92E1);
Complement sweep
Loud — keep it behind large type only
background: linear-gradient(90deg, #aaace8, #E8E6AA);
Spotlight
Hero panels and app headers
background: radial-gradient(120% 120% at 20% 0%, #F2F2FC 0%, #aaace8 45%, #1B1D64 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%, #D2E6F3 0%, transparent 60%), radial-gradient(55% 55% at 85% 15%, #DBC2EE 0%, transparent 60%), radial-gradient(70% 70% at 50% 95%, #1B1D64 0%, transparent 65%), #aaace8;

Monochromatic scale

Palettes built from #aaace8

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.

#aaace8 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
SurfacesBadgesHighlightsEmpty states
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 9.78:1.

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.

#aaace8, answered

What color is #aaace8?

#aaace8 is a light vivid blue, closest to Light Steel Blue (ΔE2000 10.1). It sits at 238° on the hue wheel with 57% saturation and 79% lightness, which reads as cool.

What is the RGB value of #aaace8?

rgb(170, 172, 232) — 170 red, 172 green and 232 blue out of 255, or 66.7% / 67.5% / 91% by channel.

What is #aaace8 in HSL and HSV?

hsl(238, 57%, 79%) and hsv(238, 27%, 91%). HSL is what CSS takes; HSV is what your design tool's picker shows, which is why the saturation numbers rarely match.

Is #aaace8 a light or a dark color?

It is a mid-tone. Relative luminance is 0.4388 and perceived brightness is 70%, so black text on it reaches 9.78:1.

Should I use black or white text on #aaace8?

Black. It scores 9.78:1 against #aaace8, versus 2.15:1 for white — AAA at any size.

Is #aaace8 accessible on a white background?

#aaace8 on white scores 2.15:1, which fails WCAG AA at every size. Darken it to #6669D6 to reach 4.5:1, or #4246CC for 7:1.

What is the complementary color of #aaace8?

#E8E6AA sits directly opposite on the wheel. Softer options are the split-complements #E8C7AA and #CBE8AA, which give the same contrast with far less vibration.

What colors go well with #aaace8?

For interface work: #F4F4FA as the surface, #C0C1ED for borders, #4B4D9B for secondary text, #A48028 as an accent and #1B1D64 for hover and pressed states. For a palette, the analogous pair #AACBE8 and #C7AAE8 stays calm, while #E8E6AA is the loudest partner.

What is #aaace8 in CMYK for printing?

cmyk(27%, 26%, 0%, 9%). This is a screen-to-ink approximation — ask your printer for a proof before committing to a run.

Is #aaace8 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 #BFAAE8; nudged cooler, #A9C0E9.

Which Tailwind color is closest to #aaace8?

The blue family — its 500 step is #3b82f6, ΔE2000 19.6 away. That is a visible difference, so define #aaace8 as a custom token rather than reaching for the built-in.

How do I use #aaace8 in Tailwind CSS?

Inline it as an arbitrary value with bg-[#aaace8] or text-[#aaace8], 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 #aaace8 with 50% opacity?

rgba(170, 172, 232, 0.5), or #aaace880 in eight-digit hex. Over white that composites to #D5D6F4; over black, #555674.

Is #aaace8 a web-safe color?

No. The nearest web-safe colour is #9999FF, ΔE2000 8 away. The palette only matters for legacy displays and some email clients now.

What does the color #aaace8 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 #aaace8?

The safest is same-hue elevation: linear-gradient(135deg, #DADBF5, #aaace8 45%, #1B1D64). For more colour, a short hue run to #CB92E1 keeps it rich without turning muddy.

Work with #aaace8 in the Color Lab

Every tool opens with this colour already loaded.

Every value on this page is computed from #aaace8 at request time — conversions, contrast ratios and ΔE distances are calculated, never looked up.