What color is #313FDD?

#313FDD is a medium, vivid blue. In RGB it is rgb(49, 63, 221), and in HSL hsl(235, 72%, 53%).

Is #313FDD accessible as text?

On white, #313FDD has a contrast ratio of 7.28:1 (passes WCAG AA for body text); on black it is 2.89:1 (fails). For text placed on #313FDD, use white for the best readability.

What is the closest Tailwind color to #313FDD?

The nearest Tailwind CSS token is blue-700 (#1447E6).

What colors go well with #313FDD?

#313FDD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DDCF31. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #313FDD below.

Is #313FDD good for buttons?

#313FDD works well for buttons and highlights, but use white text on #313FDD — black text only reaches 2.89:1, below the 4.5:1 needed for normal-size labels.

Is #313FDD the same as CSS blue?

No — #313FDD is not the CSS named color blue, but blue (#0000FF) is the closest CSS named color.

#313FDD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #313FDD

Not just a swatch — here's how #313FDD works with other colors. Named schemes with #313FDD in its natural role, and a note on why the supporting colors balance it.

Tech Product Signal · 5 colors

Signal #313FDD Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #506EFA

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

Coastal Morning Lead · 5 colors

Lead #313FDD Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

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

Berry & Cream Lead · 5 colors

Lead #313FDD Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Cerulean sits between cream and a deep berry here, softened by a blush accent and grounded by charcoal.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #313FDD Secondary #7183B7 Support #9D8F88 Ink #18140F

Cerulean 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 Cerulean carrying the quiet middle.

Sunset Warmth Glow · 5 colors

Glow #313FDD Secondary #E86A73 Accent #F69250 Anchor #573B58 Surface #F7E7D7

Cerulean glows at the center of this sunset palette, joined by coral and gold, deepened by a plum anchor and cooled with cream.

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Color Lab

How #313FDD 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 27/100

Low

Firm and assertive — carries weight and contrast.

Depth 58/100

Moderate

Mid depth — usable as an accent or a muted ground.

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 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 91/100

Very high

Bold and ownable — memorable as a primary brand color.

UI accent fit 66/100

High

Strong interactive accent — visible and can carry a legible label.

Surface fit 9/100

Very low

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

Print safety 60/100

Moderate

Prints close, with a slight loss of vibrancy.

Pairs with #313FDD

For UI

For branding

For interior

For fashion

People also use #313FDD with

Picton Blue Blue Violet Citrine 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 7.3:1. Use

Subtle surface Use #DBDDF3 for cards and hover fills. Tint 80

Avoid beside #5C31DD — 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 #313FDD 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: #313FDD;
  --color-base-rgb: 49 63 221;
  --color-base-oklch: oklch(47.5% 0.235 269.9);
  --color-50: #F1F2FD;
  --color-100: #DBDEFA;
  --color-200: #B9BEF3;
  --color-300: #8991E6;
  --color-400: #5D67D5;
  --color-500: #3B46BA;
  --color-600: #343C8E;
  --color-700: #2A2F64;
  --color-800: #1F2242;
  --color-900: #151628;
  --color-on-base: #FFFFFF;
}

// tailwind.config.js
colors: {
  cerulean: {
    50: '#F1F2FD',
    100: '#DBDEFA',
    200: '#B9BEF3',
    300: '#8991E6',
    400: '#5D67D5',
    500: '#3B46BA',
    600: '#343C8E',
    700: '#2A2F64',
    800: '#1F2242',
    900: '#151628',
  },
}

$base: #313FDD;
$base-ink: #FFFFFF;
$base-50: #F1F2FD;
$base-100: #DBDEFA;
$base-200: #B9BEF3;
$base-300: #8991E6;
$base-400: #5D67D5;
$base-500: #3B46BA;
$base-600: #343C8E;
$base-700: #2A2F64;
$base-800: #1F2242;
$base-900: #151628;
$base-hover: #1E2BBA;
$base-subtle: #C7CBEF;

{
    "color": {
        "base": {
            "value": "#313FDD",
            "type": "color"
        },
        "onBase": {
            "value": "#FFFFFF",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F2FD",
                "type": "color"
            },
            "100": {
                "value": "#DBDEFA",
                "type": "color"
            },
            "200": {
                "value": "#B9BEF3",
                "type": "color"
            },
            "300": {
                "value": "#8991E6",
                "type": "color"
            },
            "400": {
                "value": "#5D67D5",
                "type": "color"
            },
            "500": {
                "value": "#3B46BA",
                "type": "color"
            },
            "600": {
                "value": "#343C8E",
                "type": "color"
            },
            "700": {
                "value": "#2A2F64",
                "type": "color"
            },
            "800": {
                "value": "#1F2242",
                "type": "color"
            },
            "900": {
                "value": "#151628",
                "type": "color"
            }
        }
    }
}

Palettes built on #313FDD

Color Lab

Pairs with #313FDD

UI roles & guardrails

In real applications

Scales

Every model

Export