What color is #3A4D64?

#3A4D64 is a dark, muted blue. In RGB it is rgb(58, 77, 100), and in HSL hsl(213, 27%, 31%).

Is #3A4D64 accessible as text?

On white, #3A4D64 has a contrast ratio of 8.66:1 (passes WCAG AA for body text); on black it is 2.43:1 (fails). For text placed on #3A4D64, use white for the best readability.

What is the closest Tailwind color to #3A4D64?

The nearest Tailwind CSS token is cyan-900 (#104E64).

What colors go well with #3A4D64?

#3A4D64 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #64513A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3A4D64 below.

Is #3A4D64 good for buttons?

#3A4D64 works well for buttons and highlights, but use white text on #3A4D64 — black text only reaches 2.43:1, below the 4.5:1 needed for normal-size labels.

Is #3A4D64 the same as CSS darkslategray?

No — #3A4D64 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#3A4D64 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3A4D64

Not just a swatch — here's how #3A4D64 works with other colors. Named schemes with #3A4D64 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3A4D64 Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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

Nordic Calm Accent · 5 colors

Accent #3A4D64 Secondary #AEB4B8 Surface #F1F2F0 Support #7D93A6 Anchor #2E3236

Outer Space keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #3A4D64 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #5D6F85

Outer Space is the vivid signal in this product UI — on a near-black surface with cool white, a slate grey and a lighter tint of Outer Space.

Vintage Leather Lead · 5 colors

Lead #3A4D64 Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57233B

Outer Space 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 #F6F4EF Accent #3A4D64 Secondary #6C737C Support #9D8F89 Ink #16140F

Outer Space 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 Outer Space carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #3A4D64 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 38/100

Cool

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

Softness 41/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 56/100

Moderate

Mid depth — usable as an accent or a muted ground.

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 38/100

Low

A faint retro warmth without tipping into sepia.

Luxury 60/100

Moderate

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

Brand distinctiveness 18/100

Very low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 55/100

Moderate

Workable accent with care around contrast.

Surface fit 44/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 90/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3A4D64

For UI

For branding

For interior

For fashion

People also use #3A4D64 with

Viridian Charcoal Umber Gainsboro

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 8.7:1. Use

Subtle surface Use #D5DBE3 for cards and hover fills. Tint 80

Avoid beside #3A3F64 — 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 #3A4D64 at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #3A4D64;
  --color-base-rgb: 58 77 100;
  --color-base-oklch: oklch(41.4% 0.046 253.6);
  --color-50: #F5F7FA;
  --color-100: #E5EAF0;
  --color-200: #CBD5E1;
  --color-300: #A6B6C9;
  --color-400: #8397AF;
  --color-500: #637892;
  --color-600: #505F72;
  --color-700: #3D4652;
  --color-800: #2A3037;
  --color-900: #1B1E22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  outer-space: {
    50: '#F5F7FA',
    100: '#E5EAF0',
    200: '#CBD5E1',
    300: '#A6B6C9',
    400: '#8397AF',
    500: '#637892',
    600: '#505F72',
    700: '#3D4652',
    800: '#2A3037',
    900: '#1B1E22',
  },
}

$base: #3A4D64;
$base-ink: #FFFFFF;
$base-50: #F5F7FA;
$base-100: #E5EAF0;
$base-200: #CBD5E1;
$base-300: #A6B6C9;
$base-400: #8397AF;
$base-500: #637892;
$base-600: #505F72;
$base-700: #3D4652;
$base-800: #2A3037;
$base-900: #1B1E22;
$base-hover: #2E3E50;
$base-subtle: #BFC9D5;

{
    "color": {
        "base": {
            "value": "#3A4D64",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F7FA",
                "type": "color"
            },
            "100": {
                "value": "#E5EAF0",
                "type": "color"
            },
            "200": {
                "value": "#CBD5E1",
                "type": "color"
            },
            "300": {
                "value": "#A6B6C9",
                "type": "color"
            },
            "400": {
                "value": "#8397AF",
                "type": "color"
            },
            "500": {
                "value": "#637892",
                "type": "color"
            },
            "600": {
                "value": "#505F72",
                "type": "color"
            },
            "700": {
                "value": "#3D4652",
                "type": "color"
            },
            "800": {
                "value": "#2A3037",
                "type": "color"
            },
            "900": {
                "value": "#1B1E22",
                "type": "color"
            }
        }
    }
}

Palettes built on #3A4D64

Color Lab

Pairs with #3A4D64

UI roles & guardrails

In real applications

Scales

Every model

Export