What color is #10258E?

#10258E is a dark, vivid blue. In RGB it is rgb(16, 37, 142), and in HSL hsl(230, 80%, 31%).

Is #10258E accessible as text?

On white, #10258E has a contrast ratio of 12.52:1 (passes WCAG AA for body text); on black it is 1.68:1 (fails). For text placed on #10258E, use white for the best readability.

What is the closest Tailwind color to #10258E?

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

What colors go well with #10258E?

#10258E pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #8E7910. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #10258E below.

Is #10258E good for buttons?

#10258E works well for buttons and highlights, but use white text on #10258E — black text only reaches 1.68:1, below the 4.5:1 needed for normal-size labels.

Is #10258E the same as CSS darkblue?

No — #10258E is not the CSS named color darkblue, but darkblue (#00008B) is the closest CSS named color.

#10258E Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #10258E

Not just a swatch — here's how #10258E works with other colors. Named schemes with #10258E in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #10258E 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 #10258E Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #19034E

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 #10258E 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 #10258E Secondary #7F4536 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 #10258E Secondary #4D5C7F 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.

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Color Lab

How #10258E 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 24/100

Low

Firm and assertive — carries weight and contrast.

Depth 70/100

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 24/100

Low

Clean and current — no dusty, aged cast.

Luxury 66/100

High

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

Brand distinctiveness 67/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 51/100

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 69/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #10258E

For UI

For branding

For interior

For fashion

People also use #10258E 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 12.5:1. Use

Subtle surface Use #C8CEF0 for cards and hover fills. Tint 80

Avoid beside #25108E — 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 #10258E 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: #10258E;
  --color-base-rgb: 16 37 142;
  --color-base-oklch: oklch(33.8% 0.172 266.4);
  --color-50: #F1F3FE;
  --color-100: #D9DFFC;
  --color-200: #B6C1F7;
  --color-300: #8495EB;
  --color-400: #576DDB;
  --color-500: #344BC1;
  --color-600: #2F4093;
  --color-700: #273268;
  --color-800: #1D2444;
  --color-900: #141729;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  phthalo-blue: {
    50: '#F1F3FE',
    100: '#D9DFFC',
    200: '#B6C1F7',
    300: '#8495EB',
    400: '#576DDB',
    500: '#344BC1',
    600: '#2F4093',
    700: '#273268',
    800: '#1D2444',
    900: '#141729',
  },
}

$base: #10258E;
$base-ink: #FFFFFF;
$base-50: #F1F3FE;
$base-100: #D9DFFC;
$base-200: #B6C1F7;
$base-300: #8495EB;
$base-400: #576DDB;
$base-500: #344BC1;
$base-600: #2F4093;
$base-700: #273268;
$base-800: #1D2444;
$base-900: #141729;
$base-hover: #0D1E72;
$base-subtle: #AAB5EA;

{
    "color": {
        "base": {
            "value": "#10258E",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F3FE",
                "type": "color"
            },
            "100": {
                "value": "#D9DFFC",
                "type": "color"
            },
            "200": {
                "value": "#B6C1F7",
                "type": "color"
            },
            "300": {
                "value": "#8495EB",
                "type": "color"
            },
            "400": {
                "value": "#576DDB",
                "type": "color"
            },
            "500": {
                "value": "#344BC1",
                "type": "color"
            },
            "600": {
                "value": "#2F4093",
                "type": "color"
            },
            "700": {
                "value": "#273268",
                "type": "color"
            },
            "800": {
                "value": "#1D2444",
                "type": "color"
            },
            "900": {
                "value": "#141729",
                "type": "color"
            }
        }
    }
}

Palettes built on #10258E

Color Lab

Pairs with #10258E

UI roles & guardrails

In real applications

Scales

Every model

Export