GREENS

Sea of Tranquillity

#81D1DA

RGB 129, 209, 218 · HSL 186°, 55%, 68% · CMYK 41, 4, 0, 15

Sea of Tranquillity is #81D1DA in HEX — rgb(129, 209, 218), hsl(186°, 55%, 68%), cmyk(41%, 4%, 0%, 15%).

Sea of Tranquillity pulls into the light end of the greens spectrum — HSL 186°, 55%, 68%. 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#81D1DA

RGB129, 209, 218

HSL186°, 55%, 68%

HSV186°, 41%, 85%

CMYK41, 4, 0, 15

Decimal8507866

CSS RGBrgb(129, 209, 218)

CSS HSLhsl(186, 55%, 68%)

Paint Matches — this color across 16 brands

Benjamin Moore

Baby 2056-50

ΔE 1.4 · #7BD0DA

Dulux

Bluish Water S31H1

ΔE 2 · #89D2DB

Behr

Frisky Blue M490-4

ΔE 2.3 · #7DD4E0

Kilz

Classic Turquoise RF190-01

ΔE 2.3 · #82CCD3

Vista Paint

Ocean Park K-196

ΔE 2.8 · #7CD0DE

Dunn-Edwards

Plunging Waterfall DE5751

ΔE 3 · #8CD4DF

Valspar

Beach Sparkle 5004-9C

ΔE 3.3 · #8FD4DB

Hallman-Lindsay

Quiet Pond 672

ΔE 4.6 · #94D8E2

Sherwin-Williams

Cloudless SW6786

ΔE 5 · #8FD0DD

PPG

Tropical Splash 1233-5

ΔE 5.5 · #70CBCE

Kobra

Blue 27

ΔE 6.1 · #87C8D7

Dutch Boy

Sky Blue D-6742

ΔE 9.2 · #7AC2D8

RAL

Light Green 6027

ΔE 9.5 · #84C3BE

IKEA

IKEA165 165

ΔE 11.2 · #91D0C5

Colorhouse

Dream .04 Dream-04

ΔE 11.9 · #9CC7C4

Farrow & Ball

Blue Ground 210

ΔE 13 · #A1C5C8

Light Reflectance & Undertone

Light Reflectance Value (LRV)

55/100

Light

0 · DarkLight · 100

Reflects plenty of light and keeps spaces feeling open and airy while still showing clear colour. A safe, flexible choice for living areas.

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

#81D1DA

#DA8981

Analogous

#81DAB6

#81D1DA

#81A4DA

Triadic

#81D1DA

#DA81D1

#D1DA81

Split-Complementary

#81D1DA

#DA81A4

#DAB681

Tetradic

#81D1DA

#B681DA

#DA8981

#A4DA81

Monochromatic

#2C8C96

#45BCC9

#81D1DA

#BCE7EB

#EBF8F9

Rectangle

#81D1DA

#8981DA

#DA8981

#D1DA81

Compound

#81D1DA

#81A4DA

#DA8981

#DAB681

Variations

Lighter

#9ADAE2

#B7E0E5

#D7EBED

Darker

#48C0CE

#268E99

#14545B

Saturation

#A0B8BB

#81D1DA

#6EE0ED

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

1.74:1

Fail

vs Black

12.07:1

AAA

Deuteranopia

#81D1DA

#B3BCDC

Original → Simulated

Protanopia

#81D1DA

#C6C6D9

Original → Simulated

Tritanopia

#81D1DA

#83D1CE

Original → Simulated

Color Psychology

Calm · Restorative

Sea of Tranquillity 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

#A0C9BF

Warm Bulb 2700K

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

#81D1DA

Daylight 5500K

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

#8DCEE3

Cool Bulb 6500K

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

Pairs With

#E9ECED

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.

#C66B61

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: #81D1DA;

CSS — background

background-color: #81D1DA;

CSS Variable

--color-sea-of-tranquillity: #81D1DA;

Tailwind v3 — config

colors: { 'sea-of-tranquillity': '#81D1DA' }

Tailwind — arbitrary

bg-[#81D1DA] text-[#81D1DA]

SCSS

$sea-of-tranquillity: #81D1DA;

Similar Colors

Baby Boy Blue

#7ACFD9 · ΔE 1.6

Rhythm and Blues

#8AD0DB · ΔE 3.1

Clearlake

#88CDD1 · ΔE 3.8

Fairy Tale Blue

#78CBDA · ΔE 3.9

Surf City

#87D1D2 · ΔE 4.4

Un-Teal We Meet Again

#7BC7CB · ΔE 4.5

How Blue Am I?

#84C5CE · ΔE 5.4

Tropicana Cabana

#7ED5D4 · ΔE 6.2

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 #81D1DA?

#81D1DA is Sea of Tranquillity, a soft green with a cool undertone.

Is #81D1DA warm or cool?

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

What rooms work best with Sea of Tranquillity?

Sea of Tranquillity works well in bedrooms, bathrooms, libraries. Designers typically use it for main walls, cabinetry, soft furniture.

What colors pair well with Sea of Tranquillity?

Sea of Tranquillity 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 Sea of Tranquillity?

You can download Sea of Tranquillity 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 Sea of Tranquillity?

The hex code is #81D1DA. In RGB it's 129, 209, 218, and in HSL it's 186°, 55%, 68%.

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