What color is #151B37?

#151B37 is a very dark blue-violet. In RGB it is rgb(21, 27, 55), and in HSL hsl(229, 45%, 15%).

Is #151B37 accessible as text?

On white, #151B37 has a contrast ratio of 16.88:1 (passes WCAG AA for body text); on black it is 1.24:1 (fails). For text placed on #151B37, use white for the best readability.

What is the closest Tailwind color to #151B37?

The nearest Tailwind CSS token is indigo-950 (#1E1A4D).

What colors go well with #151B37?

#151B37 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #373115. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #151B37 below.

Is #151B37 good for buttons?

#151B37 works well for buttons and highlights, but use white text on #151B37 — black text only reaches 1.24:1, below the 4.5:1 needed for normal-size labels.

Is #151B37 the same as CSS midnightblue?

No — #151B37 is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#151B37 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #151B37

Not just a swatch — here's how #151B37 works with other colors. Named schemes with #151B37 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #151B37 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Graphite 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 #151B37 Secondary #AEB4B8 Surface #F1F2F0 Support #7E92A7 Anchor #2E3236

Graphite 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 #151B37 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #323A55

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

Vintage Leather Lead · 5 colors

Lead #151B37 Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

Graphite 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 #151B37 Secondary #3D404B Support #9D8F88 Ink #18140F

Graphite 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 Graphite carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #151B37 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

Neutral

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

Softness 24/100

Low

Firm and assertive — carries weight and contrast.

Depth 74/100

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 28/100

Low

A faint retro warmth without tipping into sepia.

Luxury 75/100

High

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

Brand distinctiveness 21/100

Low

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

UI accent fit 16/100

Very low

Weak as an action color — too pale, too dark or too muted to signal.

Surface fit 53/100

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 #151B37

For UI

For branding

For interior

For fashion

People also use #151B37 with

Charcoal Russian Violet Bistre Gainsboro Gunmetal Gray

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 16.9:1. Use

Subtle surface Use #C6CBE2 for cards and hover fills. Tint 80

Avoid beside #1A1537 — 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 #151B37 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: #151B37;
  --color-base-rgb: 21 27 55;
  --color-base-oklch: oklch(23.3% 0.055 272.4);
  --color-50: #F4F5FB;
  --color-100: #E1E4F4;
  --color-200: #C4CBE8;
  --color-300: #9BA5D5;
  --color-400: #7481BE;
  --color-500: #5361A2;
  --color-600: #454F7D;
  --color-700: #353C5A;
  --color-800: #262A3B;
  --color-900: #191B25;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  graphite: {
    50: '#F4F5FB',
    100: '#E1E4F4',
    200: '#C4CBE8',
    300: '#9BA5D5',
    400: '#7481BE',
    500: '#5361A2',
    600: '#454F7D',
    700: '#353C5A',
    800: '#262A3B',
    900: '#191B25',
  },
}

$base: #151B37;
$base-ink: #FFFFFF;
$base-50: #F4F5FB;
$base-100: #E1E4F4;
$base-200: #C4CBE8;
$base-300: #9BA5D5;
$base-400: #7481BE;
$base-500: #5361A2;
$base-600: #454F7D;
$base-700: #353C5A;
$base-800: #262A3B;
$base-900: #191B25;
$base-hover: #11162C;
$base-subtle: #A8B0D4;

{
    "color": {
        "base": {
            "value": "#151B37",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F4F5FB",
                "type": "color"
            },
            "100": {
                "value": "#E1E4F4",
                "type": "color"
            },
            "200": {
                "value": "#C4CBE8",
                "type": "color"
            },
            "300": {
                "value": "#9BA5D5",
                "type": "color"
            },
            "400": {
                "value": "#7481BE",
                "type": "color"
            },
            "500": {
                "value": "#5361A2",
                "type": "color"
            },
            "600": {
                "value": "#454F7D",
                "type": "color"
            },
            "700": {
                "value": "#353C5A",
                "type": "color"
            },
            "800": {
                "value": "#262A3B",
                "type": "color"
            },
            "900": {
                "value": "#191B25",
                "type": "color"
            }
        }
    }
}