What color is #397BB1?

#397BB1 is a medium cyan-blue. In RGB it is rgb(57, 123, 177), and in HSL hsl(207, 51%, 46%).

Is #397BB1 accessible as text?

On white, #397BB1 has a contrast ratio of 4.52:1 (passes WCAG AA for body text); on black it is 4.64:1 (passes). For text placed on #397BB1, use black for the best readability.

What is the closest Tailwind color to #397BB1?

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

What colors go well with #397BB1?

#397BB1 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B16F39. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #397BB1 below.

Is #397BB1 good for buttons?

#397BB1 works for buttons; black text has the higher contrast, so prefer it for labels.

Is #397BB1 the same as CSS steelblue?

No — #397BB1 is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#397BB1 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #397BB1

Not just a swatch — here's how #397BB1 works with other colors. Named schemes with #397BB1 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #397BB1 Accent #A5C4C0 Surface #DDDBBF Secondary #9AA0A1 Anchor #20344A

Steel 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 #397BB1 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #65A0D2

Steel 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 Steel Blue.

Vintage Leather Lead · 5 colors

Lead #397BB1 Secondary #7F4438 Surface #E1DDC0 Accent #375245 Anchor #57233C

Steel 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 #397BB1 Surface #EDE9D6 Anchor #5A2246 Accent #E4C2CB Secondary #322B2F

Steel 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 #397BB1 Secondary #8DA3B6 Support #969386 Ink #16140F

Steel 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 Steel Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #397BB1 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 19/100

Cool

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

Softness 47/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 44/100

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 53/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 51/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 29/100

Low

Quiet and neutral — a supporting tone, not a signature.

UI accent fit 94/100

Very high

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

Surface fit 26/100

Low

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

Print safety 75/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #397BB1

For UI

For branding

For interior

For fashion

People also use #397BB1 with

Robin Egg Blue Cobalt Blue Copper Gainsboro Charcoal

UI roles & guardrails

Primary action Safe as a filled button with white label. AA

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 4.5:1. Use

Subtle surface Use #D9E4EE for cards and hover fills. Tint 80

Avoid beside #3953B1 — 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 #397BB1 at work across the surfaces designers actually ship.

Website / UI

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Build faster.

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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: #397BB1;
  --color-base-rgb: 57 123 177;
  --color-base-oklch: oklch(56.5% 0.107 246.0);
  --color-50: #F3F8FC;
  --color-100: #E0ECF6;
  --color-200: #C1D8EB;
  --color-300: #97BBD9;
  --color-400: #6F9DC3;
  --color-500: #4E7FA7;
  --color-600: #416481;
  --color-700: #33495C;
  --color-800: #24323D;
  --color-900: #181F26;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  steel-blue: {
    50: '#F3F8FC',
    100: '#E0ECF6',
    200: '#C1D8EB',
    300: '#97BBD9',
    400: '#6F9DC3',
    500: '#4E7FA7',
    600: '#416481',
    700: '#33495C',
    800: '#24323D',
    900: '#181F26',
  },
}

$base: #397BB1;
$base-ink: #141310;
$base-50: #F3F8FC;
$base-100: #E0ECF6;
$base-200: #C1D8EB;
$base-300: #97BBD9;
$base-400: #6F9DC3;
$base-500: #4E7FA7;
$base-600: #416481;
$base-700: #33495C;
$base-800: #24323D;
$base-900: #181F26;
$base-hover: #2E638E;
$base-subtle: #C6D7E6;

{
    "color": {
        "base": {
            "value": "#397BB1",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FC",
                "type": "color"
            },
            "100": {
                "value": "#E0ECF6",
                "type": "color"
            },
            "200": {
                "value": "#C1D8EB",
                "type": "color"
            },
            "300": {
                "value": "#97BBD9",
                "type": "color"
            },
            "400": {
                "value": "#6F9DC3",
                "type": "color"
            },
            "500": {
                "value": "#4E7FA7",
                "type": "color"
            },
            "600": {
                "value": "#416481",
                "type": "color"
            },
            "700": {
                "value": "#33495C",
                "type": "color"
            },
            "800": {
                "value": "#24323D",
                "type": "color"
            },
            "900": {
                "value": "#181F26",
                "type": "color"
            }
        }
    }
}

Palettes built on #397BB1

Color Lab

Pairs with #397BB1

UI roles & guardrails

In real applications

Scales

Every model

Export