What color is #151BB7?

#151BB7 is a medium, vivid blue. In RGB it is rgb(21, 27, 183), and in HSL hsl(238, 79%, 40%).

Is #151BB7 accessible as text?

On white, #151BB7 has a contrast ratio of 11.22:1 (passes WCAG AA for body text); on black it is 1.87:1 (fails). For text placed on #151BB7, use white for the best readability.

What is the closest Tailwind color to #151BB7?

The nearest Tailwind CSS token is indigo-800 (#372AAC).

What colors go well with #151BB7?

#151BB7 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B7B115. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #151BB7 below.

Is #151BB7 good for buttons?

#151BB7 works well for buttons and highlights, but use white text on #151BB7 — black text only reaches 1.87:1, below the 4.5:1 needed for normal-size labels.

Is #151BB7 the same as CSS mediumblue?

No — #151BB7 is not the CSS named color mediumblue, but mediumblue (#0000CD) is the closest CSS named color.

#151BB7 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #151BB7

Not just a swatch — here's how #151BB7 works with other colors. Named schemes with #151BB7 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #151BB7 Anchor #141210 Accent #DD965A Secondary #242933 Surface #F4ECE3

Zaffre carries the depth in this luxury scheme, offset by a brass accent and near-black and held together by a deep neutral and an off-white surface.

Tech Product Signal · 5 colors

Signal #151BB7 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #2F51D4

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

Moody Editorial Color · 5 colors

Color #151BB7 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #24006A

Zaffre adds the colour to this moody editorial scheme — charcoal and a mid-grey around it, a bone highlight, and a muted jewel accent drawn from Zaffre.

Coastal Morning Lead · 5 colors

Lead #151BB7 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #151BB7 Secondary #536696 Support #9D8F88 Ink #18140F

Zaffre 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 Zaffre carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #151BB7 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 10/100

Cool

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

Softness 22/100

Low

Firm and assertive — carries weight and contrast.

Depth 68/100

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 12/100

Very low

Clean and current — no dusty, aged cast.

Luxury 59/100

Moderate

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

Brand distinctiveness 88/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 48/100

Moderate

Workable accent with care around contrast.

Surface fit 16/100

Very low

Too saturated or mid-toned for big areas — keep it to accents.

Print safety 59/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #151BB7

For UI

For branding

For interior

For fashion

People also use #151BB7 with

Dodger Blue Grape Citron Gainsboro Prussian Blue

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 11.2:1. Use

Subtle surface Use #CFD0F2 for cards and hover fills. Tint 80

Avoid beside #4615B7 — 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 #151BB7 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: #151BB7;
  --color-base-rgb: 21 27 183;
  --color-base-oklch: oklch(37.6% 0.228 267.1);
  --color-50: #F1F1FE;
  --color-100: #DADBFC;
  --color-200: #B6B8F6;
  --color-300: #8588EB;
  --color-400: #585CDA;
  --color-500: #3539C0;
  --color-600: #303392;
  --color-700: #282A67;
  --color-800: #1D1F43;
  --color-900: #141529;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  zaffre: {
    50: '#F1F1FE',
    100: '#DADBFC',
    200: '#B6B8F6',
    300: '#8588EB',
    400: '#585CDA',
    500: '#3539C0',
    600: '#303392',
    700: '#282A67',
    800: '#1D1F43',
    900: '#141529',
  },
}

$base: #151BB7;
$base-ink: #FFFFFF;
$base-50: #F1F1FE;
$base-100: #DADBFC;
$base-200: #B6B8F6;
$base-300: #8588EB;
$base-400: #585CDA;
$base-500: #3539C0;
$base-600: #303392;
$base-700: #282A67;
$base-800: #1D1F43;
$base-900: #141529;
$base-hover: #111592;
$base-subtle: #B6B7ED;

{
    "color": {
        "base": {
            "value": "#151BB7",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F1FE",
                "type": "color"
            },
            "100": {
                "value": "#DADBFC",
                "type": "color"
            },
            "200": {
                "value": "#B6B8F6",
                "type": "color"
            },
            "300": {
                "value": "#8588EB",
                "type": "color"
            },
            "400": {
                "value": "#585CDA",
                "type": "color"
            },
            "500": {
                "value": "#3539C0",
                "type": "color"
            },
            "600": {
                "value": "#303392",
                "type": "color"
            },
            "700": {
                "value": "#282A67",
                "type": "color"
            },
            "800": {
                "value": "#1D1F43",
                "type": "color"
            },
            "900": {
                "value": "#141529",
                "type": "color"
            }
        }
    }
}

Palettes built on #151BB7

Color Lab

Pairs with #151BB7

UI roles & guardrails

In real applications

Scales

Every model

Export