BLUES

Smalt

#003399

RGB 0, 51, 153 · HSL 220°, 100%, 30% · CMYK 100, 67, 0, 40

Smalt is #003399 in HEX — rgb(0, 51, 153), hsl(220°, 100%, 30%), cmyk(100%, 67%, 0%, 40%).

Smalt pulls into the rich end of the blues spectrum — HSL 220°, 100%, 30%. The saturated saturation makes it bold and immediate, 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#003399

RGB0, 51, 153

HSL220°, 100%, 30%

HSV220°, 100%, 60%

CMYK100, 67, 0, 40

Decimal13209

CSS RGBrgb(0, 51, 153)

CSS HSLhsl(220, 100%, 30%)

Paint Matches — this color across 16 brands

Behr

Navy Blue S-H-580

ΔE 2.6 · #0B2F97

Dutch Boy

Blue Royale VS-9550

ΔE 15 · #243F90

Colorhouse

Petal .05 Petal-05

ΔE 22.5 · #1F4992

RAL

Signal Blue 5005

ΔE 22.8 · #1E2D6E

Vista Paint

Blue Highlight C-612

ΔE 25.2 · #334688

Hallman-Lindsay

Blue Highlight 613

ΔE 26.8 · #324A8B

PPG

Crushed Velvet 1245-7

ΔE 26.9 · #445397

Benjamin Moore

Evening 2066-20

ΔE 27.5 · #014F94

Dulux

Mondrian Blue S39H9

ΔE 28.5 · #0F4B8C

Dunn-Edwards

Deep Sapphire DEA137

ΔE 28.7 · #1D4E8F

Valspar

Homecoming Blue 4009-9

ΔE 34.1 · #484E83

Sherwin-Williams

Morning Glory SW6971

ΔE 34.6 · #3C4C80

Kilz

Superstition RH250

ΔE 36.1 · #604C7F

Kobra

Violet 25

ΔE 36.3 · #776BAB

IKEA

IKEA128 128

ΔE 39.2 · #4A72B0

Farrow & Ball

Pitch Blue 220

ΔE 51.3 · #636E8F

Light Reflectance & Undertone

Light Reflectance Value (LRV)

5/100

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

#003399

#996600

Analogous

#007F99

#003399

#190099

Triadic

#003399

#990033

#339900

Split-Complementary

#003399

#991900

#7F9900

Tetradic

#003399

#99007F

#996600

#00991A

Monochromatic

#00081A

#00194D

#003399

#004CE6

#3377FF

Rectangle

#003399

#660099

#996600

#339900

Compound

#003399

#190099

#996600

#7F9900

Variations

Lighter

#004BE0

#3976EF

#95B2EC

Darker

#00297A

#001C54

#001031

Saturation

#364563

#003399

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

10.86:1

AAA

vs Black

1.93:1

Fail

Deuteranopia

#003399

#003E99

Original → Simulated

Protanopia

#003399

#2E2E91

Original → Simulated

Tritanopia

#003399

#004F3E

Original → Simulated

Color Psychology

Focused · Cooling

Smalt 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

#3F538E

Warm Bulb 2700K

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

#003399

Daylight 5500K

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

#2D58B2

Cool Bulb 6500K

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

Pairs With

#E7E9EE

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.

#75520D

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: #003399;

CSS — background

background-color: #003399;

CSS Variable

--color-smalt: #003399;

Tailwind v3 — config

colors: { 'smalt': '#003399' }

Tailwind — arbitrary

bg-[#003399] text-[#003399]

SCSS

$smalt: #003399;

Similar Colors

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#00498D · ΔE 26.5

Evening Blue

#004E93 · ΔE 27.3

Blue

#233872 · ΔE 28.3

Twilight Blue

#365496 · ΔE 28.7

Scandinavian Blue

#4E4E8C · ΔE 29.1

Delphinium

#304C89 · ΔE 29.7

Basic Blue

#3F457D · ΔE 30.9

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#334076 · ΔE 31.5

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 #003399?

#003399 is Smalt, a deep blue with a cool undertone.

Is #003399 warm or cool?

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

What rooms work best with Smalt?

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

What colors pair well with Smalt?

Smalt 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 Smalt?

You can download Smalt 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 Smalt?

The hex code is #003399. In RGB it's 0, 51, 153, and in HSL it's 220°, 100%, 30%.

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