GREENS

Aquarium Blue

#66CDAA

RGB 102, 205, 170 · HSL 160°, 51%, 60% · CMYK 50, 0, 17, 20

Aquarium Blue is #66CDAA in HEX — rgb(102, 205, 170), hsl(160°, 51%, 60%), cmyk(50%, 0%, 17%, 20%).

Aquarium Blue pulls into the light end of the greens spectrum — HSL 160°, 51%, 60%. The balanced saturation makes it confident without overpowering, and the hue reads cool. In interior projects it shines on bedrooms, bathrooms, libraries — for grounding, restorative spaces. Reads best alongside soft white walls, oak floors, brass, warm clay accents.

Color Codes

HEX#66CDAA

RGB102, 205, 170

HSL160°, 51%, 60%

HSV160°, 50%, 80%

CMYK50, 0, 17, 20

Decimal6737322

CSS RGBrgb(102, 205, 170)

CSS HSLhsl(160, 51%, 60%)

Paint Matches — this color across 16 brands

Dulux

Peppy S26H4

ΔE 3.7 · #72D7B4

Benjamin Moore

Monmouth 2038-40

ΔE 3.8 · #5CC3A3

PPG

Tropical Tide 1229-4

ΔE 3.9 · #5ECAAE

Valspar

Lavish Green 6002-10A

ΔE 4.3 · #73CDAE

Behr

Aqua Fresco M460-5

ΔE 6.1 · #49CAA5

Kobra

Green 32

ΔE 6.2 · #75C89E

Vista Paint

Esmerelda K-283

ΔE 6.3 · #7ED8B9

Dunn-Edwards

Sweet Garden DE5696

ΔE 6.8 · #5FD1BA

Hallman-Lindsay

Aquamarine Ocean 715

ΔE 8.1 · #82CDAD

Kilz

Beach Toy RG140-02

ΔE 10.9 · #6ACABA

Sherwin-Williams

Larchmere SW6752

ΔE 13.4 · #70BAA7

Farrow & Ball

Arsenic 214

ΔE 17.9 · #84B59C

IKEA

IKEA165 165

ΔE 18.8 · #91D0C5

Colorhouse

Thrive .04 Thrive-04

ΔE 19.6 · #A2C8A1

RAL

Light Green 6027

ΔE 21.1 · #84C3BE

Dutch Boy

Perrenial Garden DCP-0759

ΔE 23.5 · #9AB68E

Light Reflectance & Undertone

Light Reflectance Value (LRV)

49/100

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 MasstoneTeal UndertoneGreen

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

Color Theory

Complementary

#66CDAA

#CD6588

Analogous

#65CD76

#66CDAA

#65BCCD

Triadic

#66CDAA

#AA65CD

#CDAA65

Split-Complementary

#66CDAA

#CD65BC

#CD7665

Tetradic

#66CDAA

#7665CD

#CD6588

#BCCD65

Monochromatic

#25745A

#38AD86

#66CDAA

#9FE0CA

#D8F3EA

Rectangle

#66CDAA

#6588CD

#CD6588

#CDAA65

Compound

#66CDAA

#65BCCD

#CD6588

#CD7665

Variations

Lighter

#84D7BB

#A7DCCB

#CFE8E0

Darker

#39BC90

#258364

#144E3B

Saturation

#89A99E

#65CDAA

#4CE6B3

Interior Use

Best Rooms

bedrooms, bathrooms, libraries

Best Uses

main walls, cabinetry, soft furniture

Pairs With

soft white walls, oak floors, brass, warm clay accents

Accessibility (WCAG)

vs White

1.93:1

Fail

vs Black

10.88:1

AAA

Deuteranopia

#66CDAA

#B0AFAD

Original → Simulated

Protanopia

#66CDAA

#C0C0AF

Original → Simulated

Tritanopia

#66CDAA

#71C6C7

Original → Simulated

Color Psychology

Calm · Restorative

Aquarium Blue sits in the part of the spectrum the eye relaxes into. Designers reach for green when a room needs to feel like a refuge — bedrooms, libraries, bathrooms — because it lowers visual blood-pressure without flattening the space.

SymbolismGrowth, balance, nature

PersonalitySteady, grounded, thoughtful

calmnaturerestorativebalancebedroomlibrary

How it looks under different light

#8CC69B

Warm Bulb 2700K

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

#66CDAA

Daylight 5500K

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

#79CBBF

Cool Bulb 6500K

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

Pairs With

#E9ECEB

Trim

Matched off-white

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

#F7F8F7

Ceiling

Whisper tint

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

#B84C70

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 · Trim · Soft furniture

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: #66CDAA;

CSS — background

background-color: #66CDAA;

CSS Variable

--color-aquarium-blue: #66CDAA;

Tailwind v3 — config

colors: { 'aquarium-blue': '#66CDAA' }

Tailwind — arbitrary

bg-[#66CDAA] text-[#66CDAA]

SCSS

$aquarium-blue: #66CDAA;

Similar Colors

Monmouth Green

#5BC2A2 · ΔE 4.1

St. Patty's Day

#50C9AC · ΔE 4.9

Cliffside Park

#75C8A2 · ΔE 5.3

Rosamilia Green

#66BFA0 · ΔE 6.1

Island Paradise

#5BC1A9 · ΔE 7.1

Miami Green

#3DC6AB · ΔE 7.7

Adam Green

#53C799 · ΔE 7.9

Arlington Green

#5AB990 · ΔE 8.1

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 #66CDAA?

#66CDAA is Aquarium Blue, a soft green with a cool undertone.

Is #66CDAA warm or cool?

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

What rooms work best with Aquarium Blue?

Aquarium Blue works well in bedrooms, bathrooms, libraries. Designers typically use it for main walls, cabinetry, soft furniture.

What colors pair well with Aquarium Blue?

Aquarium Blue pairs naturally with soft white walls, oak floors, brass, warm clay accents. Its complementary color is also a strong contrast option for accents.

Where can I download Aquarium Blue?

You can download Aquarium Blue 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 Aquarium Blue?

The hex code is #66CDAA. In RGB it's 102, 205, 170, and in HSL it's 160°, 51%, 60%.

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