Sky Blue (RAL 5015)

RAL sky blue, a clear and refreshing standard sky blue

HEX#2874B2

RGBrgb(40, 116, 178)

HSLhsl(207, 63%, 43%)

HSVhsv(207, 78%, 70%)

CMYKcmyk(78%, 35%, 0%, 30%)

HEXA#2874B2FF

RGBArgba(40, 116, 178, 1)

HSLAhsla(207, 63%, 43%, 1)

OKLCHoklch(73.7%, 0.089, 234)

LCHlch(70.1%, 35.6, 240)

🎨 Color Palettes

Analogous2-3 adjacent hues (≤60°)

Triadic3 hues spaced 120° apart

Split ComplementaryMain color + colors adjacent to its complement

Complementary2 hues spaced 180° apart

Tetradic (Rectangle)4 hues forming a rectangle

MonochromaticSingle hue with varying saturation and lightness

♿ WCAG Contrast Colors

Learn More →

Aa14px Body

High Contrast Text

#FFFFFFRatio 5:1AA

Suitable for body text, headings, and primary content, ensuring readability for all users

Aa14px Body

Standard Text

#F3F3FCRatio 4.5:1AA

Suitable for regular body content, meeting WCAG AA standards

Aa14px Body

Large Text / UI Components

#D6C1F1Ratio 3:1AA Large

Suitable for large text (≥18px bold or ≥24px), icons, UI component boundaries

Aa14px Body

Decorative / Dividers

#E486BARatio 2:1Fail

Suitable for decorative elements, dividers, non-essential text

📊 Color Scales

Online Color Picker → Gradient Generator →

Lightness VariationFixed hue and saturation, proportional lightness scaling 30%→100%

#0C2336

#11314B

#163E60

#1A4C74

#1F5989

#24679E

#2975B3

Saturation VariationFixed hue and lightness, proportional saturation scaling 40%→100%

#527089

#4B7191

#447297

#3D729E

#3773A4

#2F74AC

#2975B3

Lightness + Saturation Mixed VariationSimultaneous lightness and saturation proportional scaling

#1B2227

#222F3A

#273D4F

#2A4A65

#2C587D

#2B6697

#2975B3

Hue Fine-TuningFixed saturation and lightness, stepwise hue fine-tuning ±15°

#2997B3

#298CB3

#2980B3

#2975B3

#2969B3

#295EB3

#2952B3

💡 Use Cases

✈️

Tail Fin Liveries

Lufthansa's classic yellow-blue livery—the sky-blue crane tail becoming Europe's visual code for punctual, precise aviation.

⚽

Football Kits

Manchester City and Argentina's blue-white stripes—sky blue's television penetration making it the banner of attacking football.

🩺

Medical Devices

Insulin pump or ventilator interfaces—using sky blue to reduce patient alienation from chronic disease monitors.

☀️

Clean Energy

Aluminum housings for solar inverters and storage systems—conveying the sunny, sustainable future of sunlight-to-DC conversion.

📜 Origin & History

RAL 5015 Sky Blue is the industrial standard closest to an idealized clear sky. Its emergence stemmed from aviation's stringent cabin interior requirements. At 10,000 meters, sky blue counteracts the oppression of artificial lighting, creating the illusion of still being in daylight.

Lufthansa's classic 1960s livery extensively used RAL 5015 on tail fins. When fleets aligned at Frankfurt Airport, their sky-blending tails showcased post-war Germany's flight confidence and precision.

In competitive sports, sky blue boasts high recognizability. From Argentina's national team to Manchester City FC, believers in sky-blue stripes span the globe. This unstintingly bright blue sweeps across green pitches like storm winds, delivering fluid attacking football.

In recent years, sky blue has become the representative color of medical tech and clean energy. From hearing aids to insulin pumps to solar inverters, RAL 5015 conveys the clean-tech ideal of making life and the planet sunnier and more sustainable.

🧠 Color Psychology

RefreshingLike high-pressure cloudless weather—oppression instantly lifted, the mind light as if filled with pure oxygen.

FreeDirectly connecting to the unencumbered space of the stratosphere—breaking mental shackles, bringing bird-like boundlessness.

JustThe most unbiased position in the color spectrum—representing objective, transparent, impartial judgment and procedural justice.

AmbitiousThe color outside the window during climb—leaving the comfort zone behind, the ascent color of ventures and pioneers.

Universally AppealingA common aesthetic denominator across races and nations—from the Pampas to Manchester, evoking fervent belonging.

TransparentLike clear glass curtain walls—representing the internet spirit of complete information openness, rejecting any form of opacity.

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