BLUES

Cello

#3A4E5F

RGB 58, 78, 95 · HSL 208°, 24%, 30% · CMYK 39, 18, 0, 63

Cello is #3A4E5F in HEX — rgb(58, 78, 95), hsl(208°, 24%, 30%), cmyk(39%, 18%, 0%, 63%).

Cello pulls into the rich end of the blues spectrum — HSL 208°, 24%, 30%. The muted saturation makes it quiet but present, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, home offices — for calm, focused environments. Reads best alongside warm white trim, oak or walnut, brass or matte black hardware.

Color Codes

HEX#3A4E5F

RGB58, 78, 95

HSL208°, 24%, 30%

HSV208°, 39%, 37%

CMYK39, 18, 0, 63

Decimal3821151

CSS RGBrgb(58, 78, 95)

CSS HSLhsl(208, 24%, 30%)

Paint Matches — this color across 16 brands

Dulux

Blue Hue S36C8

ΔE 0.7 · #394E60

Dunn-Edwards

Midnight Haze DE5818

ΔE 1.7 · #3E505F

Sherwin-Williams

Indigo Batik SW7602

ΔE 1.8 · #3E5063

Behr

Midnight Blue N480-7

ΔE 1.9 · #354E61

Vista Paint

Day Spa C-633

ΔE 2.1 · #3E5261

Valspar

Boisterous Blue 4009-6

ΔE 2.6 · #375264

PPG

Admiralty 1042-7

ΔE 2.6 · #404E61

Hallman-Lindsay

Day Spa 634

ΔE 2.9 · #3D5463

Benjamin Moore

Hudson 1680 · CC-810

ΔE 3 · #405367

Kilz

Prussian Blue RD100-02

ΔE 4.4 · #444D5A

Farrow & Ball

Hague Blue 30

ΔE 5.1 · #3D4E57

Colorhouse

Wool .06 Wool-06

ΔE 6.1 · #485761

RAL

Slate Grey 7015

ΔE 7.7 · #434750

Kobra

Blue 31

ΔE 8.3 · #334059

IKEA

IKEA122 122

ΔE 9 · #3A5170

Dutch Boy

Ocean Blue D-6743

ΔE 12.4 · #4C6A74

Light Reflectance & Undertone

Light Reflectance Value (LRV)

7/100

Very Dark

0 · DarkLight · 100

Absorbs almost all light — dramatic and cocooning. Needs strong artificial lighting and works best as an accent or in well-lit rooms.

Undertone

TemperatureCool MasstoneBlue UndertoneViolet

Reads as a cool blue with a violet undertone showing through, especially in daylight. Pair trim and adjacent colours to either calm or amplify that undertone.

Color Theory

Complementary

#3A4E5F

#5F4B3A

Analogous

#3A5F5E

#3A4E5F

#3A3B5F

Triadic

#3A4E5F

#5F3A4E

#4E5F3A

Split-Complementary

#3A4E5F

#5F3A3B

#5F5E3A

Tetradic

#3A4E5F

#5E3A5F

#5F4B3A

#3B5F3A

Monochromatic

#0A0D10

#1D272F

#3A4E5F

#57758E

#819BB1

Rectangle

#3A4E5F

#4B3A5F

#5F4B3A

#4E5F3A

Compound

#3A4E5F

#3A3B5F

#5F4B3A

#5F5E3A

Variations

Lighter

#55728B

#7E95AA

#B6C1CB

Darker

#2E3E4D

#1F2B35

#12191F

Saturation

#474D52

#3A4E5F

#1D507C

Interior Use

Best Rooms

bedrooms, bathrooms, home offices

Best Uses

main walls, ceilings, trim, cabinetry

Pairs With

warm white trim, oak or walnut, brass or matte black hardware

Accessibility (WCAG)

vs White

8.62:1

AAA

vs Black

2.43:1

Fail

Deuteranopia

#3A4E5F

#434A60

Original → Simulated

Protanopia

#3A4E5F

#4B4B5D

Original → Simulated

Tritanopia

#3A4E5F

#39514E

Original → Simulated

Color Psychology

Focused · Cooling

Cello lowers the temperature of a room — useful in south-facing rooms that overheat visually, and in home offices where you want a clear head. Pair with warm wood and brass to keep it from reading clinical.

SymbolismTrust, depth, stability

PersonalityClear-headed, dependable, contemplative

focustrustcalmofficebedroomdepth

How it looks under different light

#6B6762

Warm Bulb 2700K

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

#3A4E5F

Daylight 5500K

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

#586C87

Cool Bulb 6500K

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

Pairs With

#EAEBEB

Trim

Matched off-white

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

#F7F7F8

Ceiling

Whisper tint

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

#514031

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: #3A4E5F;

CSS — background

background-color: #3A4E5F;

CSS Variable

--color-cello: #3A4E5F;

Tailwind v3 — config

colors: { 'cello': '#3A4E5F' }

Tailwind — arbitrary

bg-[#3A4E5F] text-[#3A4E5F]

SCSS

$cello: #3A4E5F;

Similar Colors

Hudson Bay

#3F5266 · ΔE 2.7

Washington Blue

#304656 · ΔE 3.7

Newburyport Blue

#465566 · ΔE 3.7

In the Midnight Hour

#415663 · ΔE 4.2

Hale Navy

#434B56 · ΔE 5.5

Van Deusen Blue

#485B6E · ΔE 5.7

Blue Note

#404B54 · ΔE 5.8

Twilight

#254455 · ΔE 5.9

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 #3A4E5F?

#3A4E5F is Cello, a deep blue with a cool undertone.

Is #3A4E5F warm or cool?

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

What rooms work best with Cello?

Cello works well in bedrooms, bathrooms, home offices. Designers typically use it for main walls, ceilings, trim, cabinetry.

What colors pair well with Cello?

Cello pairs naturally with warm white trim, oak or walnut, brass or matte black hardware. Its complementary color is also a strong contrast option for accents.

Where can I download Cello?

You can download Cello 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 Cello?

The hex code is #3A4E5F. In RGB it's 58, 78, 95, and in HSL it's 208°, 24%, 30%.

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