What color is #15288A?

#15288A is a dark, vivid blue. In RGB it is rgb(21, 40, 138), and in HSL hsl(230, 74%, 31%).

Is #15288A accessible as text?

On white, #15288A has a contrast ratio of 12.34:1 (passes WCAG AA for body text); on black it is 1.70:1 (fails). For text placed on #15288A, use white for the best readability.

What is the closest Tailwind color to #15288A?

The nearest Tailwind CSS token is indigo-900 (#312C85).

What colors go well with #15288A?

#15288A pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8A7615. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #15288A below.

Is #15288A good for buttons?

#15288A works well for buttons and highlights, but use white text on #15288A — black text only reaches 1.70:1, below the 4.5:1 needed for normal-size labels.

Is #15288A the same as CSS midnightblue?

No — #15288A is not the CSS named color midnightblue, but midnightblue (#191970) is the closest CSS named color.

#15288A Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #15288A

Not just a swatch — here's how #15288A works with other colors. Named schemes with #15288A in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #15288A Anchor #141210 Accent #DD965A Secondary #242933 Surface #F4ECE3

Phthalo Blue 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.

Moody Editorial Color · 5 colors

Color #15288A Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #1A074B

Phthalo Blue 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 Phthalo Blue.

Coastal Morning Lead · 5 colors

Lead #15288A Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Vintage Leather Lead · 5 colors

Lead #15288A Secondary #7F4535 Surface #EED7C2 Accent #365246 Anchor #58223A

Phthalo Blue 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 #15288A Secondary #4F5D7E Support #9D8F88 Ink #18140F

Phthalo Blue 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 Phthalo Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #15288A 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 12/100

Cool

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

Softness 25/100

Low

Firm and assertive — carries weight and contrast.

Depth 69/100

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 26/100

Low

A faint retro warmth without tipping into sepia.

Luxury 67/100

High

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

Brand distinctiveness 63/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 53/100

Moderate

Workable accent with care around contrast.

Surface fit 18/100

Very low

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

Print safety 71/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #15288A

For UI

For branding

For interior

For fashion

People also use #15288A with

Steel Blue Indigo Olive 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 12.3:1. Use

Subtle surface Use #C9CFEF for cards and hover fills. Tint 80

Avoid beside #28158A — 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 #15288A 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: #15288A;
  --color-base-rgb: 21 40 138;
  --color-base-oklch: oklch(34.0% 0.163 267.3);
  --color-50: #F1F3FE;
  --color-100: #DBE0FB;
  --color-200: #B8C2F4;
  --color-300: #8898E7;
  --color-400: #5C70D6;
  --color-500: #394FBC;
  --color-600: #33428F;
  --color-700: #2A3365;
  --color-800: #1F2542;
  --color-900: #151829;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  phthalo-blue: {
    50: '#F1F3FE',
    100: '#DBE0FB',
    200: '#B8C2F4',
    300: '#8898E7',
    400: '#5C70D6',
    500: '#394FBC',
    600: '#33428F',
    700: '#2A3365',
    800: '#1F2542',
    900: '#151829',
  },
}

$base: #15288A;
$base-ink: #FFFFFF;
$base-50: #F1F3FE;
$base-100: #DBE0FB;
$base-200: #B8C2F4;
$base-300: #8898E7;
$base-400: #5C70D6;
$base-500: #394FBC;
$base-600: #33428F;
$base-700: #2A3365;
$base-800: #1F2542;
$base-900: #151829;
$base-hover: #10206E;
$base-subtle: #ADB6E8;

{
    "color": {
        "base": {
            "value": "#15288A",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F3FE",
                "type": "color"
            },
            "100": {
                "value": "#DBE0FB",
                "type": "color"
            },
            "200": {
                "value": "#B8C2F4",
                "type": "color"
            },
            "300": {
                "value": "#8898E7",
                "type": "color"
            },
            "400": {
                "value": "#5C70D6",
                "type": "color"
            },
            "500": {
                "value": "#394FBC",
                "type": "color"
            },
            "600": {
                "value": "#33428F",
                "type": "color"
            },
            "700": {
                "value": "#2A3365",
                "type": "color"
            },
            "800": {
                "value": "#1F2542",
                "type": "color"
            },
            "900": {
                "value": "#151829",
                "type": "color"
            }
        }
    }
}

Palettes built on #15288A

Color Lab

Pairs with #15288A

UI roles & guardrails

In real applications

Scales

Every model

Export