What color is #3E366E?

#3E366E is a dark, muted indigo. In RGB it is rgb(62, 54, 110), and in HSL hsl(249, 34%, 32%).

Is #3E366E accessible as text?

On white, #3E366E has a contrast ratio of 10.73:1 (passes WCAG AA for body text); on black it is 1.96:1 (fails). For text placed on #3E366E, use white for the best readability.

What is the closest Tailwind color to #3E366E?

The nearest Tailwind CSS token is indigo-900 (#312C85).

What colors go well with #3E366E?

#3E366E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #656D36. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3E366E below.

Is #3E366E good for buttons?

#3E366E works well for buttons and highlights, but use white text on #3E366E — black text only reaches 1.96:1, below the 4.5:1 needed for normal-size labels.

Is #3E366E the same as CSS darkslateblue?

No — #3E366E is not the CSS named color darkslateblue, but darkslateblue (#483D8B) is the closest CSS named color.

#3E366E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3E366E

Not just a swatch — here's how #3E366E works with other colors. Named schemes with #3E366E in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #3E366E Anchor #141210 Accent #DB9757 Secondary #282732 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 #3E366E Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DA Accent #29183A

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 #3E366E Accent #A5C4C3 Surface #E9D6BF 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 #3E366E Secondary #7E4633 Surface #EDD8C2 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 #3E366E Secondary #656478 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.

Build a working theme in the generator →

Color Lab

How #3E366E 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 35/100

Cool

Reads cool and recessive — calming, technical, good for trust-led UI.

Softness 33/100

Low

Middle-weight — neither delicate nor heavy.

Depth 62/100

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 49/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 68/100

High

Restrained and premium — deep, quiet, high-end packaging and fashion.

Brand distinctiveness 36/100

Low

Recognisable but shares space with nearby hues.

UI accent fit 59/100

Moderate

Workable accent with care around contrast.

Surface fit 32/100

Low

Usable as a tinted surface in measured doses.

Print safety 87/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3E366E

For UI

For branding

For interior

For fashion

People also use #3E366E with

Lapis Lazuli Byzantium Dark Olive Green 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 10.7:1. Use

Subtle surface Use #D6D4E5 for cards and hover fills. Tint 80

Avoid beside #51366D — 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 #3E366E 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

Every model

Export

:root {
  --color-base: #3E366E;
  --color-base-rgb: 62 54 110;
  --color-base-oklch: oklch(37.1% 0.093 287.5);
  --color-50: #F5F4FA;
  --color-100: #E5E3F2;
  --color-200: #CDC8E4;
  --color-300: #A8A2CE;
  --color-400: #857DB5;
  --color-500: #655C98;
  --color-600: #524C76;
  --color-700: #3E3A55;
  --color-800: #2B2839;
  --color-900: #1B1A23;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  dark-slate-blue: {
    50: '#F5F4FA',
    100: '#E5E3F2',
    200: '#CDC8E4',
    300: '#A8A2CE',
    400: '#857DB5',
    500: '#655C98',
    600: '#524C76',
    700: '#3E3A55',
    800: '#2B2839',
    900: '#1B1A23',
  },
}

$base: #3E366E;
$base-ink: #FFFFFF;
$base-50: #F5F4FA;
$base-100: #E5E3F2;
$base-200: #CDC8E4;
$base-300: #A8A2CE;
$base-400: #857DB5;
$base-500: #655C98;
$base-600: #524C76;
$base-700: #3E3A55;
$base-800: #2B2839;
$base-900: #1B1A23;
$base-hover: #322B57;
$base-subtle: #C2BED8;

{
    "color": {
        "base": {
            "value": "#3E366E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F4FA",
                "type": "color"
            },
            "100": {
                "value": "#E5E3F2",
                "type": "color"
            },
            "200": {
                "value": "#CDC8E4",
                "type": "color"
            },
            "300": {
                "value": "#A8A2CE",
                "type": "color"
            },
            "400": {
                "value": "#857DB5",
                "type": "color"
            },
            "500": {
                "value": "#655C98",
                "type": "color"
            },
            "600": {
                "value": "#524C76",
                "type": "color"
            },
            "700": {
                "value": "#3E3A55",
                "type": "color"
            },
            "800": {
                "value": "#2B2839",
                "type": "color"
            },
            "900": {
                "value": "#1B1A23",
                "type": "color"
            }
        }
    }
}