What color is #397EB5?

#397EB5 is a medium cyan-blue. In RGB it is rgb(57, 126, 181), and in HSL hsl(207, 52%, 47%).

Is #397EB5 accessible as text?

On white, #397EB5 has a contrast ratio of 4.35:1 (fails WCAG AA for body text); on black it is 4.83:1 (passes). For text placed on #397EB5, use black for the best readability.

What is the closest Tailwind color to #397EB5?

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

What colors go well with #397EB5?

#397EB5 pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #B6723A. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #397EB5 below.

Is #397EB5 good for buttons?

#397EB5 works well for buttons and highlights, but use black text on #397EB5 — white text only reaches 4.35:1, below the 4.5:1 needed for normal-size labels.

Is #397EB5 the same as CSS steelblue?

No — #397EB5 is not the CSS named color steelblue, but steelblue (#4682B4) is the closest CSS named color.

#397EB5 Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #397EB5

Not just a swatch — here's how #397EB5 works with other colors. Named schemes with #397EB5 in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #397EB5 Accent #A5C4C0 Surface #DEDBBF Secondary #9AA0A0 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 #397EB5 Surface #14161A Highlight #F4F6F8 Secondary #5A6672 Accent #66A3D6

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 #397EB5 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 #397EB5 Surface #EDE9D6 Anchor #5A2246 Accent #E4C2CB Secondary #322B30

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 #397EB5 Secondary #8FA6BA 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.

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Color Lab

How #397EB5 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 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 52/100

Moderate

A faint retro warmth without tipping into sepia.

Luxury 50/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 30/100

Low

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

UI accent fit 93/100

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 #397EB5

For UI

For branding

For interior

For fashion

People also use #397EB5 with

Medium Turquoise Cobalt Blue Copper 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 white text at 4.4:1. Use

Subtle surface Use #DAE5EE for cards and hover fills. Tint 80

Avoid beside #3A55B6 — 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 #397EB5 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: #397EB5;
  --color-base-rgb: 57 126 181;
  --color-base-oklch: oklch(57.4% 0.110 245.5);
  --color-50: #F3F8FC;
  --color-100: #DFECF6;
  --color-200: #C1D8EB;
  --color-300: #96BBD9;
  --color-400: #6E9DC4;
  --color-500: #4D7FA8;
  --color-600: #416481;
  --color-700: #32495C;
  --color-800: #24323D;
  --color-900: #181F26;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  steel-blue: {
    50: '#F3F8FC',
    100: '#DFECF6',
    200: '#C1D8EB',
    300: '#96BBD9',
    400: '#6E9DC4',
    500: '#4D7FA8',
    600: '#416481',
    700: '#32495C',
    800: '#24323D',
    900: '#181F26',
  },
}

$base: #397EB5;
$base-ink: #141310;
$base-50: #F3F8FC;
$base-100: #DFECF6;
$base-200: #C1D8EB;
$base-300: #96BBD9;
$base-400: #6E9DC4;
$base-500: #4D7FA8;
$base-600: #416481;
$base-700: #32495C;
$base-800: #24323D;
$base-900: #181F26;
$base-hover: #2E6592;
$base-subtle: #C6D8E6;

{
    "color": {
        "base": {
            "value": "#397EB5",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F8FC",
                "type": "color"
            },
            "100": {
                "value": "#DFECF6",
                "type": "color"
            },
            "200": {
                "value": "#C1D8EB",
                "type": "color"
            },
            "300": {
                "value": "#96BBD9",
                "type": "color"
            },
            "400": {
                "value": "#6E9DC4",
                "type": "color"
            },
            "500": {
                "value": "#4D7FA8",
                "type": "color"
            },
            "600": {
                "value": "#416481",
                "type": "color"
            },
            "700": {
                "value": "#32495C",
                "type": "color"
            },
            "800": {
                "value": "#24323D",
                "type": "color"
            },
            "900": {
                "value": "#181F26",
                "type": "color"
            }
        }
    }
}

Palettes built on #397EB5

Color Lab

Pairs with #397EB5

UI roles & guardrails

In real applications

Scales

Every model

Export