What color is #397BDD?

#397BDD is a medium, vivid blue. In RGB it is rgb(57, 123, 221), and in HSL hsl(216, 71%, 55%).

Is #397BDD accessible as text?

On white, #397BDD has a contrast ratio of 4.16:1 (fails WCAG AA for body text); on black it is 5.05:1 (passes). For text placed on #397BDD, use black for the best readability.

What is the closest Tailwind color to #397BDD?

The nearest Tailwind CSS token is sky-600 (#0084D1).

What colors go well with #397BDD?

#397BDD pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #DE9D3B. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #397BDD below.

Is #397BDD good for buttons?

#397BDD works well for buttons and highlights, but use black text on #397BDD — white text only reaches 4.16:1, below the 4.5:1 needed for normal-size labels.

Is #397BDD the same as CSS royalblue?

No — #397BDD is not the CSS named color royalblue, but royalblue (#4169E1) is the closest CSS named color.

#397BDD Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #397BDD

Not just a swatch — here's how #397BDD works with other colors. Named schemes with #397BDD in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #397BDD Accent #A5C4C1 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

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

Tech Product Signal · 5 colors

Signal #397BDD Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #66A2FD

True 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 True Blue.

Vintage Leather Lead · 5 colors

Lead #397BDD Secondary #7F4537 Surface #E1DDC1 Accent #375246 Anchor #57223A

True 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.

Berry & Cream Lead · 5 colors

Lead #397BDD Surface #EDE9D6 Anchor #5A2144 Accent #E4C2CA Secondary #322B2F

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

Minimal Editorial Surface · 5 colors

Surface #F6F4EF Accent #397BDD Secondary #92AACD Support #9D8F89 Ink #16140F

True 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 True Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #397BDD 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 7/100

Cool

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

Softness 42/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 43/100

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 35/100

Low

A faint retro warmth without tipping into sepia.

Luxury 46/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 44/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 92/100

Very high

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

Surface fit 16/100

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 #397BDD

For UI

For branding

For interior

For fashion

People also use #397BDD with

Turquoise Han Purple Butterscotch Gainsboro Charcoal

UI roles & guardrails

Primary action Too mid-tone for a filled button — darken for the fill. AA Large

Body text Do not use for body copy on light surfaces. Avoid

Large display Fine for headings 24px+ on white. Pass

Background Pair with #141310 text at 4.5:1. Use

Subtle surface Use #DCE6F4 for cards and hover fills. Tint 80

Avoid beside #3B46DE — 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 #397BDD 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: #397BDD;
  --color-base-rgb: 57 123 221;
  --color-base-oklch: oklch(59.1% 0.164 258.4);
  --color-50: #F1F6FD;
  --color-100: #DBE8FA;
  --color-200: #B9D0F3;
  --color-300: #8AAEE5;
  --color-400: #5E8DD4;
  --color-500: #3C6EB9;
  --color-600: #35588D;
  --color-700: #2B4264;
  --color-800: #1F2D42;
  --color-900: #151D28;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  true-blue: {
    50: '#F1F6FD',
    100: '#DBE8FA',
    200: '#B9D0F3',
    300: '#8AAEE5',
    400: '#5E8DD4',
    500: '#3C6EB9',
    600: '#35588D',
    700: '#2B4264',
    800: '#1F2D42',
    900: '#151D28',
  },
}

$base: #397BDD;
$base-ink: #141310;
$base-50: #F1F6FD;
$base-100: #DBE8FA;
$base-200: #B9D0F3;
$base-300: #8AAEE5;
$base-400: #5E8DD4;
$base-500: #3C6EB9;
$base-600: #35588D;
$base-700: #2B4264;
$base-800: #1F2D42;
$base-900: #151D28;
$base-hover: #2160C0;
$base-subtle: #CAD9EF;

{
    "color": {
        "base": {
            "value": "#397BDD",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F1F6FD",
                "type": "color"
            },
            "100": {
                "value": "#DBE8FA",
                "type": "color"
            },
            "200": {
                "value": "#B9D0F3",
                "type": "color"
            },
            "300": {
                "value": "#8AAEE5",
                "type": "color"
            },
            "400": {
                "value": "#5E8DD4",
                "type": "color"
            },
            "500": {
                "value": "#3C6EB9",
                "type": "color"
            },
            "600": {
                "value": "#35588D",
                "type": "color"
            },
            "700": {
                "value": "#2B4264",
                "type": "color"
            },
            "800": {
                "value": "#1F2D42",
                "type": "color"
            },
            "900": {
                "value": "#151D28",
                "type": "color"
            }
        }
    }
}

Palettes built on #397BDD

Color Lab

Pairs with #397BDD

UI roles & guardrails

In real applications

Scales

Every model

Export