What color is #866EEF?

#866EEF is a light, vivid indigo. In RGB it is rgb(134, 110, 239), and in HSL hsl(251, 80%, 68%).

Is #866EEF accessible as text?

On white, #866EEF has a contrast ratio of 3.82:1 (fails WCAG AA for body text); on black it is 5.49:1 (passes). For text placed on #866EEF, use black for the best readability.

What is the closest Tailwind color to #866EEF?

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

What colors go well with #866EEF?

#866EEF pairs cleanly with neutrals — cream, taupe, charcoal and cool grays — and with its complementary #D7EF6C. In UI, a softer accent is often easier to use than the exact complement. Explore the harmonies, shades, tints and ready-made palettes for #866EEF below.

Is #866EEF good for buttons?

#866EEF works well for buttons and highlights, but use black text on #866EEF — white text only reaches 3.82:1, below the 4.5:1 needed for normal-size labels.

Is #866EEF the same as CSS mediumslateblue?

No — #866EEF is not the CSS named color mediumslateblue, but mediumslateblue (#7B68EE) is the closest CSS named color.

#866EEF Color — HEX, RGB, HSL, Palette & Shades

Palettes built on #866EEF

Not just a swatch — here's how #866EEF works with other colors. Named schemes with #866EEF in its natural role, and a note on why the supporting colors balance it.

Nordic Calm Accent · 5 colors

Accent #866EEF Secondary #AFB4B8 Surface #F1F2F0 Support #7F92A7 Anchor #2E3236

Medium Slate Blue keeps this Nordic scheme quiet — cool greys and a soft white around it, a muted-blue support and a charcoal anchor.

Tech Product Signal · 5 colors

Signal #866EEF Surface #14161A Highlight #F4F6F8 Secondary #5B6672 Accent #A998FF

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.

Minimal Editorial Surface · 5 colors

Surface #F8F4EF Accent #866EEF Secondary #B0ACDA Support #9D9088 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.

Japanese Sand Base · 5 colors

Base #866EEF Surface #F2E8DD Highlight #F8F0E7 Secondary #BEADA2 Ink #2C2724

Medium Slate Blue sets a calm, sun-bleached base here, wrapped in bone and paper off-whites and a soft greige, with a single ink accent for wabi-sabi restraint.

Sunset Warmth Glow · 5 colors

Glow #866EEF Secondary #E86A6E Accent #F5934B Anchor #583B57 Surface #F7E7D7

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

Build a working theme in the generator →

Color Lab

How #866EEF 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 24/100

Cool

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

Softness 41/100

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 29/100

Low

A faint retro warmth without tipping into sepia.

Luxury 41/100

Moderate

Understated — leans refined without going austere.

Brand distinctiveness 72/100

High

Bold and ownable — memorable as a primary brand color.

UI accent fit 79/100

High

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

Surface fit 19/100

Very low

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

Print safety 74/100

High

Reproduces faithfully in CMYK — safe for packaging and print.

Pairs with #866EEF

For UI

For branding

For interior

For fashion

People also use #866EEF with

Maya Blue Heliotrope Pear Gainsboro Prussian Blue

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 #E9E5F8 for cards and hover fills. Tint 80

Avoid beside #B06CEF — 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 #866EEF 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: #866EEF;
  --color-base-rgb: 134 110 239;
  --color-base-oklch: oklch(62.4% 0.186 288.3);
  --color-50: #F3F1FE;
  --color-100: #E0D9FC;
  --color-200: #C2B6F7;
  --color-300: #9784EB;
  --color-400: #6F57DB;
  --color-500: #4E34C1;
  --color-600: #412F93;
  --color-700: #332768;
  --color-800: #241D44;
  --color-900: #181429;
  --color-on-base: #141310;
}

// tailwind.config.js
colors: {
  medium-slate-blue: {
    50: '#F3F1FE',
    100: '#E0D9FC',
    200: '#C2B6F7',
    300: '#9784EB',
    400: '#6F57DB',
    500: '#4E34C1',
    600: '#412F93',
    700: '#332768',
    800: '#241D44',
    900: '#181429',
  },
}

$base: #866EEF;
$base-ink: #141310;
$base-50: #F3F1FE;
$base-100: #E0D9FC;
$base-200: #C2B6F7;
$base-300: #9784EB;
$base-400: #6F57DB;
$base-500: #4E34C1;
$base-600: #412F93;
$base-700: #332768;
$base-800: #241D44;
$base-900: #181429;
$base-hover: #502EE8;
$base-subtle: #DDD8F5;

{
    "color": {
        "base": {
            "value": "#866EEF",
            "type": "color"
        },
        "onBase": {
            "value": "#141310",
            "type": "color"
        },
        "scale": {
            "50": {
                "value": "#F3F1FE",
                "type": "color"
            },
            "100": {
                "value": "#E0D9FC",
                "type": "color"
            },
            "200": {
                "value": "#C2B6F7",
                "type": "color"
            },
            "300": {
                "value": "#9784EB",
                "type": "color"
            },
            "400": {
                "value": "#6F57DB",
                "type": "color"
            },
            "500": {
                "value": "#4E34C1",
                "type": "color"
            },
            "600": {
                "value": "#412F93",
                "type": "color"
            },
            "700": {
                "value": "#332768",
                "type": "color"
            },
            "800": {
                "value": "#241D44",
                "type": "color"
            },
            "900": {
                "value": "#181429",
                "type": "color"
            }
        }
    }
}

Palettes built on #866EEF

Color Lab

Pairs with #866EEF

UI roles & guardrails

In real applications

Scales

Every model

Export