What color is #3F4E69?

#3F4E69 is a dark, muted blue. In RGB it is rgb(63, 78, 105), and in HSL hsl(219, 25%, 33%).

Is #3F4E69 accessible as text?

On white, #3F4E69 has a contrast ratio of 8.38:1 (passes WCAG AA for body text); on black it is 2.51:1 (fails). For text placed on #3F4E69, use white for the best readability.

What is the closest Tailwind color to #3F4E69?

The nearest Tailwind CSS token is mauve-600 (#594C5B).

What colors go well with #3F4E69?

#3F4E69 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #695A3F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #3F4E69 below.

Is #3F4E69 good for buttons?

#3F4E69 works well for buttons and highlights, but use white text on #3F4E69 — black text only reaches 2.51:1, below the 4.5:1 needed for normal-size labels.

Is #3F4E69 the same as CSS darkslategray?

No — #3F4E69 is not the CSS named color darkslategray, but darkslategray (#2F4F4F) is the closest CSS named color.

#3F4E69 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #3F4E69

Not just a swatch — here's how #3F4E69 works with other colors. Named schemes with #3F4E69 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #3F4E69 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 #3F4E69 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 #3F4E69 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #61708A

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 #3F4E69 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 #3F4E69 Secondary #707580 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.

Build a working theme in the generator →

Color Lab

How #3F4E69 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 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 40/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 60/100

Moderate

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

Brand distinctiveness 19/100

Very low

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

UI accent fit 58/100

Moderate

Workable accent with care around contrast.

Surface fit 43/100

Moderate

Usable as a tinted surface in measured doses.

Print safety 91/100

Very high

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #3F4E69

For UI

For branding

For interior

For fashion

People also use #3F4E69 with

Teal Blue Dark Slate Blue Coffee Gainsboro Charcoal

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 8.4:1. Use

Subtle surface Use #D7DBE3 for cards and hover fills. Tint 80

Avoid beside #3F4069 — 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 #3F4E69 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: #3F4E69;
  --color-base-rgb: 63 78 105;
  --color-base-oklch: oklch(42.3% 0.049 261.9);
  --color-50: #F5F7F9;
  --color-100: #E5E9F0;
  --color-200: #CCD3E0;
  --color-300: #A7B3C8;
  --color-400: #8493AE;
  --color-500: #647490;
  --color-600: #515C70;
  --color-700: #3D4451;
  --color-800: #2A2F36;
  --color-900: #1B1E22;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  outer-space: {
    50: '#F5F7F9',
    100: '#E5E9F0',
    200: '#CCD3E0',
    300: '#A7B3C8',
    400: '#8493AE',
    500: '#647490',
    600: '#515C70',
    700: '#3D4451',
    800: '#2A2F36',
    900: '#1B1E22',
  },
}

$base: #3F4E69;
$base-ink: #FFFFFF;
$base-50: #F5F7F9;
$base-100: #E5E9F0;
$base-200: #CCD3E0;
$base-300: #A7B3C8;
$base-400: #8493AE;
$base-500: #647490;
$base-600: #515C70;
$base-700: #3D4451;
$base-800: #2A2F36;
$base-900: #1B1E22;
$base-hover: #323E54;
$base-subtle: #C2C9D5;

{
    "color": {
        "base": {
            "value": "#3F4E69",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F5F7F9",
                "type": "color"
            },
            "100": {
                "value": "#E5E9F0",
                "type": "color"
            },
            "200": {
                "value": "#CCD3E0",
                "type": "color"
            },
            "300": {
                "value": "#A7B3C8",
                "type": "color"
            },
            "400": {
                "value": "#8493AE",
                "type": "color"
            },
            "500": {
                "value": "#647490",
                "type": "color"
            },
            "600": {
                "value": "#515C70",
                "type": "color"
            },
            "700": {
                "value": "#3D4451",
                "type": "color"
            },
            "800": {
                "value": "#2A2F36",
                "type": "color"
            },
            "900": {
                "value": "#1B1E22",
                "type": "color"
            }
        }
    }
}

Palettes built on #3F4E69

Color Lab

Pairs with #3F4E69

UI roles & guardrails

In real applications

Scales

Every model

Export