What color is #3F4E5A?

#3F4E5A is a dark low-chroma blue-gray with a subtle blue cast. In RGB it is rgb(63, 78, 90), and in HSL hsl(207, 18%, 30%).

Is #3F4E5A accessible as text?

On white, #3F4E5A has a contrast ratio of 8.58:1 (passes WCAG AA for body text); on black it is 2.45:1 (fails). For text placed on #3F4E5A, use white for the best readability.

What is the closest Tailwind color to #3F4E5A?

The nearest Tailwind CSS token is gray-600 (#4A5565).

What colors go well with #3F4E5A?

As a neutral, #3F4E5A 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 #3F4E5A the same as CSS darkslategray?

No — #3F4E5A 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.

#3F4E5A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3F4E5A

Not just a swatch — here's how #3F4E5A works with other colors. Named schemes with #3F4E5A in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3F4E5A Accent #A5C4C0 Surface #DEDABF Secondary #9AA0A0 Anchor #1F344A

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 #3F4E5A Secondary #AEB4B8 Surface #F1F2F0 Support #7C93A6 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 #3F4E5A Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #61707B

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 #3F4E5A Secondary #7F4438 Surface #E2DDC0 Accent #375245 Anchor #57233C

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 #3F4E5A Secondary #6E7479 Support #969386 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.

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Color Lab

How #3F4E5A 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 43/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 55/100

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 32/100

Low

A faint retro warmth without tipping into sepia.

Luxury 58/100

Moderate

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

Brand distinctiveness 11/100

Very low

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

UI accent fit 48/100

Moderate

Workable accent with care around contrast.

Surface fit 50/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 93/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3F4E5A

For UI

For branding

For interior

For fashion

People also use #3F4E5A 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 8.6:1. Use

Subtle surface Use #D7DCE0 for cards and hover fills. Tint 80

Avoid beside #3F455A — 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 #3F4E5A 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: #3F4E5A;
  --color-base-rgb: 63 78 90;
  --color-base-oklch: oklch(41.6% 0.028 242.5);
  --color-50: #F6F8F9;
  --color-100: #E7EBEE;
  --color-200: #CFD7DE;
  --color-300: #ACB9C3;
  --color-400: #8A9AA8;
  --color-500: #6B7C8A;
  --color-600: #56626C;
  --color-700: #40484F;
  --color-800: #2C3135;
  --color-900: #1C1F21;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  outer-space: {
    50: '#F6F8F9',
    100: '#E7EBEE',
    200: '#CFD7DE',
    300: '#ACB9C3',
    400: '#8A9AA8',
    500: '#6B7C8A',
    600: '#56626C',
    700: '#40484F',
    800: '#2C3135',
    900: '#1C1F21',
  },
}

$base: #3F4E5A;
$base-ink: #FFFFFF;
$base-50: #F6F8F9;
$base-100: #E7EBEE;
$base-200: #CFD7DE;
$base-300: #ACB9C3;
$base-400: #8A9AA8;
$base-500: #6B7C8A;
$base-600: #56626C;
$base-700: #40484F;
$base-800: #2C3135;
$base-900: #1C1F21;
$base-hover: #323E48;
$base-subtle: #C2CAD1;

{
    "color": {
        "base": {
            "value": "#3F4E5A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F6F8F9",
                "type": "color"
            },
            "100": {
                "value": "#E7EBEE",
                "type": "color"
            },
            "200": {
                "value": "#CFD7DE",
                "type": "color"
            },
            "300": {
                "value": "#ACB9C3",
                "type": "color"
            },
            "400": {
                "value": "#8A9AA8",
                "type": "color"
            },
            "500": {
                "value": "#6B7C8A",
                "type": "color"
            },
            "600": {
                "value": "#56626C",
                "type": "color"
            },
            "700": {
                "value": "#40484F",
                "type": "color"
            },
            "800": {
                "value": "#2C3135",
                "type": "color"
            },
            "900": {
                "value": "#1C1F21",
                "type": "color"
            }
        }
    }
}

Palettes built on #3F4E5A

Color Lab

Pairs with #3F4E5A

UI roles & guardrails

In real applications

Scales

Every model

Export