BLUES

Blue Bird Day

#237FAC

RGB 35, 127, 172 · HSL 200°, 66%, 41% · CMYK 80, 26, 0, 33

Blue Bird Day is #237FAC in HEX — rgb(35, 127, 172), hsl(200°, 66%, 41%), cmyk(80%, 26%, 0%, 33%).

Blue Bird Day pulls into the rich end of the blues spectrum — HSL 200°, 66%, 41%. The balanced saturation makes it confident without overpowering, 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#237FAC

RGB35, 127, 172

HSL200°, 66%, 41%

HSV200°, 80%, 67%

CMYK80, 26, 0, 33

Decimal2326444

CSS RGBrgb(35, 127, 172)

CSS HSLhsl(200, 66%, 41%)

Paint Matches — this color across 16 brands

Behr

Living Stream M490-6

ΔE 2 · #297BA7

PPG

Neptune 1237-7

ΔE 2.3 · #007DAC

Vista Paint

Hidden Springs K-145

ΔE 2.4 · #1A84B2

Dulux

Blue Vacation S35E5

ΔE 2.5 · #1E83AE

Sherwin-Williams

Blue Plate SW6796

ΔE 2.9 · #017CA7

Kobra

Blue 29

ΔE 3.1 · #1882B4

Dunn-Edwards

Summer Lake DE5838

ΔE 3.8 · #0077A7

Benjamin Moore

Blue 784

ΔE 4.7 · #2575A4

Valspar

Deep Blue Sea 5001-10C

ΔE 6.3 · #4387AC

Hallman-Lindsay

Peninsula 654

ΔE 6.6 · #37799C

Kilz

Blue Splash RD250-02

ΔE 6.6 · #2A7FA1

RAL

Light Blue 5012

ΔE 9.3 · #3B83BD

Farrow & Ball

St Giles Blue 280

ΔE 13.1 · #599EC4

IKEA

IKEA128 128

ΔE 16.7 · #4A72B0

Colorhouse

Dream .06 Dream-06

ΔE 22.2 · #0E707B

Dutch Boy

Ocean Blue D-6743

ΔE 23.5 · #4C6A74

Light Reflectance & Undertone

Light Reflectance Value (LRV)

19/100

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

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

#237FAC

#AE5224

Analogous

#24AE97

#237FAC

#243BAE

Triadic

#237FAC

#AE2480

#80AE24

Split-Complementary

#237FAC

#AE243B

#AE9724

Tetradic

#237FAC

#9724AE

#AE5224

#3BAE24

Monochromatic

#0A222F

#17516E

#237FAC

#45A7D9

#84C5E6

Rectangle

#237FAC

#5224AE

#AE5224

#80AE24

Compound

#237FAC

#243BAE

#AE5224

#AE9724

Variations

Lighter

#37A1D6

#72B6D7

#B2D2E3

Darker

#1A678E

#104763

#082A3B

Saturation

#546F7D

#2480AE

#1285BF

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

4.47:1

AA Large

vs Black

4.70:1

Deuteranopia

#237FAC

#5871AD

Original → Simulated

Protanopia

#237FAC

#7575A7

Original → Simulated

Tritanopia

#237FAC

#13877F

Original → Simulated

Color Psychology

Focused · Cooling

Blue Bird Day 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

#5A8C9C

Warm Bulb 2700K

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

#237FAC

Daylight 5500K

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

#4791C0

Cool Bulb 6500K

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

Pairs With

#E8EBED

Trim

Matched off-white

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

#F7F8F8

Ceiling

Whisper tint

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

#8B4827

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: #237FAC;

CSS — background

background-color: #237FAC;

CSS Variable

--color-blue-bird-day: #237FAC;

Tailwind v3 — config

colors: { 'blue-bird-day': '#237FAC' }

Tailwind — arbitrary

bg-[#237FAC] text-[#237FAC]

SCSS

$blue-bird-day: #237FAC;

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#3E90B8 · ΔE 7.3

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#006EA1 · ΔE 8.0

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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 #237FAC?

#237FAC is Blue Bird Day, a mid-tone blue with a cool undertone.

Is #237FAC warm or cool?

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

What rooms work best with Blue Bird Day?

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

What colors pair well with Blue Bird Day?

Blue Bird Day 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 Blue Bird Day?

You can download Blue Bird Day 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 Blue Bird Day?

The hex code is #237FAC. In RGB it's 35, 127, 172, and in HSL it's 200°, 66%, 41%.

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