What color is #3F495A?

#3F495A is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(63, 73, 90), and in HSL hsl(218, 18%, 30%).

Is #3F495A accessible as text?

On white, #3F495A has a contrast ratio of 9.08:1 (passes WCAG AA for body text); on black it is 2.31:1 (fails). For text placed on #3F495A, use white for the best readability.

What is the closest Tailwind color to #3F495A?

The nearest Tailwind CSS token is gray-700 (#364153).

What colors go well with #3F495A?

As a neutral, #3F495A pairs cleanly with white, off-white and light grays for text, and sits under accent hues like blue, violet, emerald or warm orange — use it as a dark surface or high-contrast base and let the accent carry the color.

Is #3F495A the same as CSS darkslategray?

No — #3F495A is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color by perceptual color distance — it sits in a different color family, so treat it as a rough reference, not a match.

#3F495A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3F495A

Not just a swatch — here's how #3F495A works with other colors. Named schemes with #3F495A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3F495A Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #21344A

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 #3F495A 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 #3F495A Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #616A7B

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 #3F495A Secondary #7F4536 Surface #E1DDC1 Accent #375246 Anchor #57223A

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 #F8F4EF Accent #3F495A Secondary #6C7076 Support #9D8F88 Ink #18140F

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.

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Color Lab

How #3F495A 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 42/100

Neutral

Balanced temperature — flexible, sits between warm and cool schemes.

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 34/100

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 12/100

Very low

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

UI accent fit 47/100

Moderate

Workable accent with care around contrast.

Surface fit 49/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 94/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3F495A

For UI

For branding

For interior

For fashion

People also use #3F495A with

Myrtle Green 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 9.1:1. Use

Subtle surface Use #D7DAE0 for cards and hover fills. Tint 80

Avoid beside #3F405A — 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 #3F495A at work across the surfaces designers actually ship.

Website / UI

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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: #3F495A;
  --color-base-rgb: 63 73 90;
  --color-base-oklch: oklch(40.3% 0.032 261.0);
  --color-50: #F6F7F9;
  --color-100: #E7EAEE;
  --color-200: #CFD4DE;
  --color-300: #ACB5C3;
  --color-400: #8A95A8;
  --color-500: #6B768A;
  --color-600: #565E6C;
  --color-700: #40454F;
  --color-800: #2C2F35;
  --color-900: #1C1E21;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  outer-space: {
    50: '#F6F7F9',
    100: '#E7EAEE',
    200: '#CFD4DE',
    300: '#ACB5C3',
    400: '#8A95A8',
    500: '#6B768A',
    600: '#565E6C',
    700: '#40454F',
    800: '#2C2F35',
    900: '#1C1E21',
  },
}

$base: #3F495A;
$base-ink: #FFFFFF;
$base-50: #F6F7F9;
$base-100: #E7EAEE;
$base-200: #CFD4DE;
$base-300: #ACB5C3;
$base-400: #8A95A8;
$base-500: #6B768A;
$base-600: #565E6C;
$base-700: #40454F;
$base-800: #2C2F35;
$base-900: #1C1E21;
$base-hover: #323A48;
$base-subtle: #C2C7D1;

{
    "color": {
        "base": {
            "value": "#3F495A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F7F9",
                "type": "color"
            },
            "100": {
                "value": "#E7EAEE",
                "type": "color"
            },
            "200": {
                "value": "#CFD4DE",
                "type": "color"
            },
            "300": {
                "value": "#ACB5C3",
                "type": "color"
            },
            "400": {
                "value": "#8A95A8",
                "type": "color"
            },
            "500": {
                "value": "#6B768A",
                "type": "color"
            },
            "600": {
                "value": "#565E6C",
                "type": "color"
            },
            "700": {
                "value": "#40454F",
                "type": "color"
            },
            "800": {
                "value": "#2C2F35",
                "type": "color"
            },
            "900": {
                "value": "#1C1E21",
                "type": "color"
            }
        }
    }
}

Palettes built on #3F495A

Color Lab

Pairs with #3F495A

UI roles & guardrails

In real applications

Scales

Every model

Export