What color is #657CDF?

#657CDF is a light, soft blue. In RGB it is rgb(101, 124, 223), and in HSL hsl(229, 66%, 64%).

Is #657CDF accessible as text?

On white, #657CDF has a contrast ratio of 3.82:1 (fails WCAG AA for body text); on black it is 5.50:1 (passes). For text placed on #657CDF, use black for the best readability.

What is the closest Tailwind color to #657CDF?

The nearest Tailwind CSS token is indigo-400 (#7C86FF).

What colors go well with #657CDF?

#657CDF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #E0CA67. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #657CDF below.

Is #657CDF good for buttons?

#657CDF works well for buttons and highlights, but use black text on #657CDF — white text only reaches 3.82:1, below the 4.5:1 needed for normal-size labels.

Is #657CDF the same as CSS mediumslateblue?

No — #657CDF is not the CSS named color mediumslateblue, but mediumslateblue (#7B68EE) is the closest CSS named color.

#657CDF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #657CDF

Not just a swatch — here's how #657CDF works with other colors. Named schemes with #657CDF in its natural role, and a note on why the supporting colors balance it.

Coastal Morning Lead · 5 colors

Lead #657CDF Accent #A5C4C2 Surface #EAD5C0 Secondary #9AA0A1 Anchor #21344A

Medium Slate 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 #657CDF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #8BA3FF

Medium Slate 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 Medium Slate Blue.

Vintage Leather Lead · 5 colors

Lead #657CDF Secondary #7F4535 Surface #EED7C2 Accent #365247 Anchor #582239

Medium Slate 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 #657CDF Surface #F6E5D8 Anchor #5B2143 Accent #E5C2C9 Secondary #322B2F

Medium Slate Blue 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 #657CDF Secondary #A3AED2 Support #9D8F88 Ink #18140F

Medium Slate 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 Medium Slate Blue carrying the quiet middle.

Build a working theme in the generator →

Color Lab

How #657CDF 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 16/100

Cool

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

Softness 45/100

Moderate

Middle-weight — neither delicate nor heavy.

Depth 40/100

Low

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

Naturalness 0/100

Very low

Reads engineered rather than organic — synthetic, digital.

Vintage feel 39/100

Low

A faint retro warmth without tipping into sepia.

Luxury 44/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 41/100

Moderate

Recognisable but shares space with nearby hues.

UI accent fit 88/100

Very high

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

Surface fit 18/100

Very 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 #657CDF

For UI

For branding

For interior

For fashion

People also use #657CDF with

Sky Blue Medium Purple Saffron Gainsboro Gunmetal Gray

UI roles & guardrails

Primary action Safe as a filled button with near-black label. AA

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 4.9:1. Use

Subtle surface Use #E4E7F5 for cards and hover fills. Tint 80

Avoid beside #7967E0 — 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 #657CDF at work across the surfaces designers actually ship.

Website / UI

Northwind Sign up

Build faster.

A working theme, generated in seconds.

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: #657CDF;
  --color-base-rgb: 101 124 223;
  --color-base-oklch: oklch(61.6% 0.151 271.5);
  --color-50: #F2F4FD;
  --color-100: #DCE2F9;
  --color-200: #BBC5F1;
  --color-300: #8D9DE2;
  --color-400: #6276D0;
  --color-500: #4056B5;
  --color-600: #38478A;
  --color-700: #2D3762;
  --color-800: #212640;
  --color-900: #161928;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F2F4FD',
    100: '#DCE2F9',
    200: '#BBC5F1',
    300: '#8D9DE2',
    400: '#6276D0',
    500: '#4056B5',
    600: '#38478A',
    700: '#2D3762',
    800: '#212640',
    900: '#161928',
  },
}

$base: #657CDF;
$base-ink: #141310;
$base-50: #F2F4FD;
$base-100: #DCE2F9;
$base-200: #BBC5F1;
$base-300: #8D9DE2;
$base-400: #6276D0;
$base-500: #4056B5;
$base-600: #38478A;
$base-700: #2D3762;
$base-800: #212640;
$base-900: #161928;
$base-hover: #304FD5;
$base-subtle: #D6DBF1;

{
    "color": {
        "base": {
            "value": "#657CDF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F2F4FD",
                "type": "color"
            },
            "100": {
                "value": "#DCE2F9",
                "type": "color"
            },
            "200": {
                "value": "#BBC5F1",
                "type": "color"
            },
            "300": {
                "value": "#8D9DE2",
                "type": "color"
            },
            "400": {
                "value": "#6276D0",
                "type": "color"
            },
            "500": {
                "value": "#4056B5",
                "type": "color"
            },
            "600": {
                "value": "#38478A",
                "type": "color"
            },
            "700": {
                "value": "#2D3762",
                "type": "color"
            },
            "800": {
                "value": "#212640",
                "type": "color"
            },
            "900": {
                "value": "#161928",
                "type": "color"
            }
        }
    }
}

Palettes built on #657CDF

Color Lab

Pairs with #657CDF

UI roles & guardrails

In real applications

Scales

Every model

Export