What color is #231FA2?

#231FA2 is a dark blue. In RGB it is rgb(35, 31, 162), and in HSL hsl(242, 68%, 38%).

Is #231FA2 accessible as text?

On white, #231FA2 has a contrast ratio of 11.74:1 (passes WCAG AA for body text); on black it is 1.79:1 (fails). For text placed on #231FA2, use white for the best readability.

What is the closest Tailwind color to #231FA2?

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

What colors go well with #231FA2?

#231FA2 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #9EA31F. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #231FA2 below.

Is #231FA2 good for buttons?

#231FA2 works well for buttons and highlights, but use white text on #231FA2 — black text only reaches 1.79:1, below the 4.5:1 needed for normal-size labels.

Is #231FA2 the same as CSS darkblue?

No — #231FA2 is not the CSS named color darkblue, but darkblue (#00008B) is the closest CSS named color.

#231FA2 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #231FA2

Not just a swatch — here's how #231FA2 works with other colors. Named schemes with #231FA2 in its natural role, and a note on why the supporting colors balance it.

Luxury Packaging Feature · 5 colors

Feature #231FA2 Anchor #141210 Accent #DC9659 Secondary #252833 Surface #F3ECE3

Klein 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.

Tech Product Signal · 5 colors

Signal #231FA2 Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #3E4EC0

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

Moody Editorial Color · 5 colors

Color #231FA2 Anchor #2A2A2E Secondary #6E6E74 Surface #EEE5DB Accent #24005A

Klein 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 Klein Blue.

Coastal Morning Lead · 5 colors

Lead #231FA2 Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Klein Blue 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 #231FA2 Secondary #55618B Support #9D8F88 Ink #18140F

Klein 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 Klein Blue carrying the quiet middle.

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Color Lab

How #231FA2 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 13/100

Cool

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

Softness 24/100

Low

Firm and assertive — carries weight and contrast.

Depth 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 19/100

Very low

Clean and current — no dusty, aged cast.

Luxury 62/100

High

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

Brand distinctiveness 76/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 53/100

Moderate

Workable accent with care around contrast.

Surface fit 17/100

Very low

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

Print safety 67/100

High

Prints close, with a slight loss of vibrancy.

Pairs with #231FA2

For UI

For branding

For interior

For fashion

People also use #231FA2 with

True 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 11.7:1. Use

Subtle surface Use #D1D0EF for cards and hover fills. Tint 80

Avoid beside #4F1FA3 — 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 #231FA2 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: #231FA2;
  --color-base-rgb: 35 31 162;
  --color-base-oklch: oklch(36.1% 0.198 271.8);
  --color-50: #F2F2FD;
  --color-100: #DDDCF9;
  --color-200: #BCBBF2;
  --color-300: #8F8CE3;
  --color-400: #6461D1;
  --color-500: #433FB6;
  --color-600: #39378B;
  --color-700: #2E2C63;
  --color-800: #212041;
  --color-900: #161528;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  klein-blue: {
    50: '#F2F2FD',
    100: '#DDDCF9',
    200: '#BCBBF2',
    300: '#8F8CE3',
    400: '#6461D1',
    500: '#433FB6',
    600: '#39378B',
    700: '#2E2C63',
    800: '#212041',
    900: '#161528',
  },
}

$base: #231FA2;
$base-ink: #FFFFFF;
$base-50: #F2F2FD;
$base-100: #DDDCF9;
$base-200: #BCBBF2;
$base-300: #8F8CE3;
$base-400: #6461D1;
$base-500: #433FB6;
$base-600: #39378B;
$base-700: #2E2C63;
$base-800: #212041;
$base-900: #161528;
$base-hover: #1C1982;
$base-subtle: #B9B7E8;

{
    "color": {
        "base": {
            "value": "#231FA2",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F2FD",
                "type": "color"
            },
            "100": {
                "value": "#DDDCF9",
                "type": "color"
            },
            "200": {
                "value": "#BCBBF2",
                "type": "color"
            },
            "300": {
                "value": "#8F8CE3",
                "type": "color"
            },
            "400": {
                "value": "#6461D1",
                "type": "color"
            },
            "500": {
                "value": "#433FB6",
                "type": "color"
            },
            "600": {
                "value": "#39378B",
                "type": "color"
            },
            "700": {
                "value": "#2E2C63",
                "type": "color"
            },
            "800": {
                "value": "#212041",
                "type": "color"
            },
            "900": {
                "value": "#161528",
                "type": "color"
            }
        }
    }
}

Palettes built on #231FA2

Color Lab

Pairs with #231FA2

UI roles & guardrails

In real applications

Scales

Every model

Export