BLUES

Astrolab Reef

#2D9BCE

RGB 45, 155, 206 · HSL 199°, 64%, 49% · CMYK 78, 25, 0, 19

Astrolab Reef is #2D9BCE in HEX — rgb(45, 155, 206), hsl(199°, 64%, 49%), cmyk(78%, 25%, 0%, 19%).

Astrolab Reef pulls into the mid-tone end of the blues spectrum — HSL 199°, 64%, 49%. 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#2D9BCE

RGB45, 155, 206

HSL199°, 64%, 49%

HSV199°, 78%, 81%

CMYK78, 25, 0, 19

Decimal2989006

CSS RGBrgb(45, 155, 206)

CSS HSLhsl(199, 64%, 49%)

Paint Matches — this color across 16 brands

Dulux

Astrolab Reef S35G4 · SB8D6

Exact match

Benjamin Moore

Bayberry 790

ΔE 2.6 · #409ED2

PPG

Sorcerer 1240-5

ΔE 2.7 · #3398CE

Kilz

Hero Blue RD280-02

ΔE 2.9 · #1898C8

Dunn-Edwards

Pool Party DE5837

ΔE 3.7 · #0098C8

Sherwin-Williams

Dynamic Blue SW6958

ΔE 3.8 · #0192C6

Behr

El Capitan MQ4-56

ΔE 4.3 · #18A4DA

Valspar

Blue Burst 4008-10B

ΔE 4.4 · #3097D0

Vista Paint

Bonaventure K-146

ΔE 5.4 · #4A9CC7

Hallman-Lindsay

Charybdis 661

ΔE 8.8 · #16A3CB

Farrow & Ball

St Giles Blue 280

ΔE 9 · #599EC4

Kobra

Blue 29

ΔE 9.5 · #1882B4

RAL

Light Blue 5012

ΔE 12.4 · #3B83BD

IKEA

IKEA086 86

ΔE 19.7 · #748DAC

Dutch Boy

Sky Blue D-6742

ΔE 22.3 · #7AC2D8

Colorhouse

Dream .06 Dream-06

ΔE 28.7 · #0E707B

Light Reflectance & Undertone

Light Reflectance Value (LRV)

28/100

Medium

0 · DarkLight · 100

Balanced reflectance — holds colour without washing out. Versatile for most rooms and the most forgiving range for true-to-chip results.

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

#2D9BCE

#CD602D

Analogous

#2DCDB0

#2D9BCE

#2D4ACD

Triadic

#2D9BCE

#CD2D9A

#9ACD2D

Split-Complementary

#2D9BCE

#CD2D4A

#CDB02D

Tetradic

#2D9BCE

#B02DCD

#CD602D

#4ACD2D

Monochromatic

#113C4F

#1F6B8E

#2D9BCE

#68B9DE

#A7D6EC

Rectangle

#2D9BCE

#602DCD

#CD602D

#9ACD2D

Compound

#2D9BCE

#2D4ACD

#CD602D

#CDB02D

Variations

Lighter

#54AFDA

#87C1DB

#BDD9E6

Darker

#217DA7

#145675

#0B3345

Saturation

#658695

#2D9ACD

#16A3E3

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

3.14:1

AA Large

vs Black

6.69:1

Deuteranopia

#2D9BCE

#6E89CF

Original → Simulated

Protanopia

#2D9BCE

#8F8FC8

Original → Simulated

Tritanopia

#2D9BCE

#1DA39B

Original → Simulated

Color Psychology

Focused · Cooling

Astrolab Reef 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

#61A1B6

Warm Bulb 2700K

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

#2D9BCE

Daylight 5500K

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

#4EA6DA

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.

#A45530

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: #2D9BCE;

CSS — background

background-color: #2D9BCE;

CSS Variable

--color-astrolab-reef: #2D9BCE;

Tailwind v3 — config

colors: { 'astrolab-reef': '#2D9BCE' }

Tailwind — arbitrary

bg-[#2D9BCE] text-[#2D9BCE]

SCSS

$astrolab-reef: #2D9BCE;

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#3F9DD1 · ΔE 2.5

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#4298C4 · ΔE 4.6

Toronto Blue

#199FCC · ΔE 5.2

Utah Sky

#1C94D0 · ΔE 6.1

Sailor's Sea Blue

#4A93BE · ΔE 6.9

Electric Blue

#3E90B8 · ΔE 7.6

Rocky Mountain Sky

#0F97D8 · ΔE 8.4

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 #2D9BCE?

#2D9BCE is Astrolab Reef, a mid-tone blue with a cool undertone.

Is #2D9BCE warm or cool?

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

What rooms work best with Astrolab Reef?

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

What colors pair well with Astrolab Reef?

Astrolab Reef 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 Astrolab Reef?

You can download Astrolab Reef 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 Astrolab Reef?

The hex code is #2D9BCE. In RGB it's 45, 155, 206, and in HSL it's 199°, 64%, 49%.

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