GREYS

Shutter Blue

#666E7F

RGB 102, 110, 127 · HSL 221°, 11%, 45% · CMYK 20, 13, 0, 50

Shutter Blue is #666E7F in HEX — rgb(102, 110, 127), hsl(221°, 11%, 45%), cmyk(20%, 13%, 0%, 50%).

Shutter Blue pulls into the mid-tone end of the greys spectrum — HSL 221°, 11%, 45%. The neutral saturation makes it near-neutral and forgiving, and the hue reads cool. In interior projects it shines on walls, soft furniture, hard surfaces — as the project's quiet backbone. Reads best alongside white trim, natural wood, brass, soft black accents.

Color Codes

HEX#666E7F

RGB102, 110, 127

HSL221°, 11%, 45%

HSV221°, 20%, 50%

CMYK20, 13, 0, 50

Decimal6712959

CSS RGBrgb(102, 110, 127)

CSS HSLhsl(221, 11%, 45%)

Paint Matches — this color across 16 brands

Dulux

Shutter Blue S40B5

ΔE 0.8 · #666F7F

Behr

Encore MQ5-11

ΔE 1.6 · #6B7182

Hallman-Lindsay

Overlook 1319

ΔE 1.6 · #686D7C

Vista Paint

Overlook C-1318

ΔE 2.3 · #686C7A

Benjamin Moore

Amethyst 1441 · CC-930

ΔE 2.7 · #6F7283

PPG

License To Dream 10-22

ΔE 2.9 · #667486

Valspar

Pacific Coast 4004-4B

ΔE 3.2 · #6C7686

Sherwin-Williams

Distance SW6243

ΔE 3.7 · #5D6F7F

IKEA

IKEA154 154

ΔE 4.3 · #667480

Dunn-Edwards

Wharf View DEC799

ΔE 4.6 · #65737E

RAL

Pearl Black Berry 4012

ΔE 6.9 · #6C6881

Kilz

Deep Charcoal RM130

ΔE 7.5 · #5F6F75

Farrow & Ball

Stiffkey Blue 281

ΔE 8.7 · #4D5B6A

Dutch Boy

Ocean Blue D-6743

ΔE 9.8 · #4C6A74

Colorhouse

Wool .06 Wool-06

ΔE 11.4 · #485761

Kobra

Grey 42

ΔE 14 · #889099

Light Reflectance & Undertone

Light Reflectance Value (LRV)

16/100

Dark

0 · DarkLight · 100

Soaks up light and feels moody and intimate. Great for studies, dining rooms and accent walls; pair with ample lighting.

Undertone

TemperatureCool MasstoneBlue UndertoneViolet

A near-neutral with a subtle cool violet undertone — it will pick up colour from surrounding surfaces and shift noticeably under different light.

Color Theory

Complementary

#666E7F

#7F7766

Analogous

#667B7F

#666E7F

#6B667F

Triadic

#666E7F

#7F666E

#6E7F66

Split-Complementary

#666E7F

#7F6B66

#7B7F66

Tetradic

#666E7F

#7F667B

#7F7766

#667F6B

Monochromatic

#22252A

#444955

#666E7F

#8E95A4

#B8BDC6

Rectangle

#666E7F

#77667F

#7F7766

#6E7F66

Compound

#666E7F

#6B667F

#7F7766

#7B7F66

Variations

Lighter

#828A9B

#A3A8B3

#CACDD2

Darker

#515866

#373C47

#202329

Saturation

#6F7177

#666E7F

#335BB2

Interior Use

Best Rooms

living rooms, bedrooms, bathrooms

Best Uses

walls, soft furniture, hard surfaces

Pairs With

white trim, natural wood, brass, soft black accents

Accessibility (WCAG)

vs White

5.12:1

vs Black

4.10:1

AA Large

Deuteranopia

#666E7F

#686D80

Original → Simulated

Protanopia

#666E7F

#6D6D7D

Original → Simulated

Tritanopia

#666E7F

#65716F

Original → Simulated

Color Psychology

Quiet · Versatile

Shutter Blue gets out of the way so the architecture and the people in the room do the work. The right neutral is never a default — it reads warm or cool, dusty or sharp depending on its undertone, and that undertone is what makes or breaks the room.

SymbolismBalance, sophistication, calm

PersonalityAdaptable, considered, timeless

versatileneutraltimelessbackdroptrimwall

How it looks under different light

#8C7F7A

Warm Bulb 2700K

Incandescent / soft white LED — pulls colour toward yellow/amber.

#666E7F

Daylight 5500K

Midday natural light or daylight-spec LED — closest to the paint chip.

#79849F

Cool Bulb 6500K

Cool white LED / overcast daylight — pulls colour toward blue.

Pairs With

#EAEAEB

Trim

Matched off-white

Same hue at 92% lightness — trim reads coordinated, not stark.

#F7F7F7

Ceiling

Whisper tint

Near-white with a hint of the hero's undertone — ceiling feels intentional.

#7A6A49

Accent

Complementary punch

Hue +180°, slightly muted for paint vs. screen — use on a door, frame, or single piece.

#574738

Floor

Walnut neutral

Warm mid-brown grounds the scheme regardless of hero hue.

Paint Info

Brand · Product Line

Benjamin Moore / Regal Select Interior

Recommended Finishes

Eggshell (walls) · Pearl (trim) · Matte (ceiling)

Eggshell hides imperfections on main walls while keeping the color rich; pearl on trim adds subtle sheen and easier cleaning; flat matte on ceilings prevents glare.

Best Surfaces

Primary walls · Cabinetry · Doors · Mouldings

Coverage & Dry Time

Typical coverage 350-400 sq ft per gallon over a primed surface.

Touch-dry in ~1 hour. Recoat after 4 hours. Full cure 7-14 days.

Primer

Standard primer is adequate.

Application Tip

Use a 9" microfiber roller on walls and a 2.5" angled sash brush for trim cuts. Two coats minimum for even depth.

Paint Calculator

Wall area (m²)

Coats

Coverage (m² / L)

You'll need

4.0 litres

1.06 US gallons · room for one touch-up coat. Buy slightly more to ensure single-batch match.

Code Snippets

CSS — color

color: #666E7F;

CSS — background

background-color: #666E7F;

CSS Variable

--color-shutter-blue: #666E7F;

Tailwind v3 — config

colors: { 'shutter-blue': '#666E7F' }

Tailwind — arbitrary

bg-[#666E7F] text-[#666E7F]

SCSS

$shutter-blue: #666E7F;

Similar Colors

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#6E7182 · ΔE 2.5

Blue Gaspe

#5C6274 · ΔE 4.8

French Violet

#696D86 · ΔE 5.1

Andes Summit

#586471 · ΔE 5.3

Britannia Blue

#67737C · ΔE 5.3

Thousand Oceans

#5E7480 · ΔE 6.2

In the Twilight

#747D92 · ΔE 6.4

Philipsburg Blue

#627885 · ΔE 6.4

Built by DSGN.HOUSE Updated 2026

Our color tools run on our own catalogue of 26,000+ real paint colors across 16 brands — Benjamin Moore, Sherwin-Williams, Behr, Dulux, RAL and more — with the color math (HSL and CIELAB matching) computed in-house, not scraped from summaries. Every color you pick maps to a real, buyable paint with its code, so what you see here you can actually take to the store. We review and update these tools and their data regularly.

Created by Denis Kataev, founder of DSGN.HOUSE — a software engineer and digital entrepreneur building professional color-design tools for everyone.

Frequently Asked Questions

What color is #666E7F?

#666E7F is Shutter Blue, a mid-tone grey with a cool undertone.

Is #666E7F warm or cool?

Shutter Blue reads cool, which influences how it interacts with surrounding tones and natural light.

What rooms work best with Shutter Blue?

Shutter Blue works well in living rooms, bedrooms, bathrooms. Designers typically use it for walls, soft furniture, hard surfaces.

What colors pair well with Shutter Blue?

Shutter Blue pairs naturally with white trim, natural wood, brass, soft black accents. Its complementary color is also a strong contrast option for accents.

Where can I download Shutter Blue?

You can download Shutter Blue on DSGN.HOUSE in 15 designer formats including CSS gradient, Figma, Procreate swatches, Tailwind config, Adobe ASE, SVG, and 4K wallpapers — all free.

What's the hex code for Shutter Blue?

The hex code is #666E7F. In RGB it's 102, 110, 127, and in HSL it's 221°, 11%, 45%.

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