Nearest named color: Dark Slate Blue
#372E8A
#372E8A
Nearest named
Dark Slate Blue
Family
Blue
Lightness
37.2%
Chroma
0.147
Hue angle
280.9°
Temperature
Cool
Contrast on white
10.94:1 · AAA
Contrast on black
1.70:1 · Fail
Web-safe
#333399
CSS oklch()
37% 0.15 281

#372E8A is a deep, cool purple. On the Color Lab it reads clean and engineered, quietly premium. It carries a legible label as a UI accent and reproduces cleanly in print.

Palettes built on #372E8A

Not just a swatch — here's how #372E8A works with other colors. Named schemes with #372E8A in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors
Feature #372E8A Anchor #141210 Accent #DB9758 Secondary #272833 Surface #F3ECE3

Dark Slate Blue carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Moody Editorial Color · 5 colors
Color #372E8A Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DA Accent #2A104B

Dark Slate Blue adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Dark Slate Blue.

Coastal Morning Lead · 5 colors
Lead #372E8A Accent #A5C4C3 Surface #EAD5BF Secondary #9AA0A1 Anchor #22334A

Dark Slate Blue opens this coastal palette with sea-glass and warm sand alongside it, grounded by driftwood grey and a deep-navy anchor.

Vintage Leather Lead · 5 colors
Lead #372E8A Secondary #7F4534 Surface #EDD7C2 Accent #365247 Anchor #582238

Dark Slate Blue plays the worn-leather lead, deepened by saddle brown and an oxblood anchor, softened by aged cream and cooled by a muted forest green.

Minimal Editorial Surface · 5 colors
Surface #F8F4EF Accent #372E8A Secondary #616384 Support #9D9088 Ink #18140F

Dark Slate Blue is the single accent in this high-contrast editorial system — set on near-white paper against near-black ink, with a warm grey and a desaturated tint of Dark Slate Blue carrying the quiet middle.

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Color Lab

How #372E8A actually behaves in design work — read from its OKLCH lightness, chroma and hue, not just its raw numbers. Ten signals to help you decide where this color earns its place.

Warmth 23/100
Cool
Reads cool and recessive — calming, technical, good for trust-led UI.
Softness 29/100
Low
Firm and assertive — carries weight and contrast.
Depth 65/100
High
Deep and grounding — anchors a layout, strong dark-mode base.
Naturalness 0/100
Very low
Reads engineered rather than organic — synthetic, digital.
Vintage feel 34/100
Low
A faint retro warmth without tipping into sepia.
Luxury 66/100
High
Restrained and premium — deep, quiet, high-end packaging and fashion.
Brand distinctiveness 57/100
Moderate
Recognisable but shares space with nearby hues.
UI accent fit 65/100
High
Strong interactive accent — visible and can carry a legible label.
Surface fit 16/100
Very low
Too saturated or mid-toned for big areas — keep it to accents.
Print safety 78/100
High
Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #372E8A

For UI
For branding
For interior
For fashion
People also use #372E8A with
Lapis Lazuli Eminence Olive Gainsboro Prussian Blue

UI roles & guardrails

Primary action Safe as a filled button with white label. AAA
Body text Passes on white at 16px and above. Pass
Large display Fine for headings 24px+ on white. Pass
Background Pair with white text at 10.9:1. Use
Subtle surface Use #D5D3EA for cards and hover fills. Tint 80
Avoid beside #562E8A — the hue gap is too small to read as intentional. Clash

In real applications

Not a swatch to memorise — a color to build with. Here is #372E8A at work across the surfaces designers actually ship.

Website / UI
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Dashboard
Revenue
$48.2k ▲ 12%
Brand
AVELINE
Studio
Poster
Nov 14 · 8PM
NIGHT
MARKET
Packaging
BLOOM
Botanical Wash
250 ml
Interior

Scales

ShadesBase darkened in 10% steps
TintsBase lifted toward white
TonesSaturation removed, lightness held
Monochromatic scaleDesign-system ready, 50–900
50 100 200 300 400 500 600 700 800 900

Every model

Export

:root {
  --color-base: #372E8A;
  --color-base-rgb: 55 46 138;
  --color-base-oklch: oklch(37.2% 0.147 280.9);
  --color-50: #F4F3FC;
  --color-100: #E2E0F5;
  --color-200: #C6C2EB;
  --color-300: #9E97D8;
  --color-400: #7870C2;
  --color-500: #574EA6;
  --color-600: #484280;
  --color-700: #37335C;
  --color-800: #27243C;
  --color-900: #191825;
  --color-on-base: #FFFFFF;
}