BLUES

Winter Sea

#303F55

RGB 48, 63, 85 · HSL 216°, 28%, 26% · CMYK 44, 26, 0, 67

Winter Sea is #303F55 in HEX — rgb(48, 63, 85), hsl(216°, 28%, 26%), cmyk(44%, 26%, 0%, 67%).

Winter Sea pulls into the deep end of the blues spectrum — HSL 216°, 28%, 26%. 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#303F55

RGB48, 63, 85

HSL216°, 28%, 26%

HSV216°, 44%, 33%

CMYK44, 26, 0, 67

Decimal3161941

CSS RGBrgb(48, 63, 85)

CSS HSLhsl(216, 28%, 26%)

Paint Matches — this color across 16 brands

Dulux

Winter Sea S40D9

Exact match

Behr

Soulful HDC-FL13-7

ΔE 1.6 · #354258

Dunn-Edwards

Black River Falls DEA189

ΔE 1.7 · #343E54

Hallman-Lindsay

Star-studded 620

ΔE 1.8 · #32425A

Vista Paint

Star-Studded C-619

ΔE 2.1 · #313F58

Kobra

Blue 31

ΔE 2.3 · #334059

Benjamin Moore

Deep 2061-10

ΔE 3.5 · #303A4C

Sherwin-Williams

Salty Dog SW9177

ΔE 4.2 · #234058

PPG

Victory Blue 1165-7

ΔE 4.5 · #3A405A

Kilz

Blue Galaxy RB100-02

ΔE 5.5 · #41445C

RAL

Ocean Blue 5020

ΔE 6.1 · #1D334A

Valspar

Indigo Streamer 4010-4

ΔE 7.4 · #404C5B

IKEA

IKEA122 122

ΔE 9.3 · #3A5170

Farrow & Ball

Hague Blue 30

ΔE 10.7 · #3D4E57

Dutch Boy

Royal Blue D-6740

ΔE 10.9 · #1D375C

Colorhouse

Wool .06 Wool-06

ΔE 12.9 · #485761

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

#303F55

#554630

Analogous

#305155

#303F55

#333055

Triadic

#303F55

#55303F

#3F5530

Split-Complementary

#303F55

#553330

#515530

Tetradic

#303F55

#553051

#554630

#305533

Monochromatic

#090C10

#141A24

#303F55

#4B6386

#6F89AE

Rectangle

#303F55

#463055

#554630

#3F5530

Compound

#303F55

#333055

#554630

#515530

Variations

Lighter

#4B6285

#7388A9

#B0BACA

Darker

#253245

#192230

#0E141C

Saturation

#3D4148

#303F55

#183A6D

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

10.67:1

AAA

vs Black

1.97:1

Fail

Deuteranopia

#303F55

#343D55

Original → Simulated

Protanopia

#303F55

#3D3D53

Original → Simulated

Tritanopia

#303F55

#2E4340

Original → Simulated

Color Psychology

Focused · Cooling

Winter Sea 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

#635C5B

Warm Bulb 2700K

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

#303F55

Daylight 5500K

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

#51617F

Cool Bulb 6500K

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

Pairs With

#EAEAEC

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.

#463B2A

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: #303F55;

CSS — background

background-color: #303F55;

CSS Variable

--color-winter-sea: #303F55;

Tailwind v3 — config

colors: { 'winter-sea': '#303F55' }

Tailwind — arbitrary

bg-[#303F55] text-[#303F55]

SCSS

$winter-sea: #303F55;

Similar Colors

Deep Royal

#2F394B · ΔE 3.8

North Sea

#2B3B4C · ΔE 3.9

Old Navy

#2E3549 · ΔE 4.9

Marine Blue

#1D3E59 · ΔE 5.6

Washington Blue

#304656 · ΔE 5.6

Jet Blue

#414A62 · ΔE 5.8

Blackberry Punch

#3F4150 · ΔE 6.5

Twilight

#254455 · ΔE 6.7

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 #303F55?

#303F55 is Winter Sea, a deep blue with a cool undertone.

Is #303F55 warm or cool?

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

What rooms work best with Winter Sea?

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

What colors pair well with Winter Sea?

Winter Sea 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 Winter Sea?

You can download Winter Sea 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 Winter Sea?

The hex code is #303F55. In RGB it's 48, 63, 85, and in HSL it's 216°, 28%, 26%.

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