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Royal Blue vs Cobalt Blue

What's the difference? Side-by-side comparison with color codes, shades, and usage guide.

Royal Blue#4169E1
Cobalt Blue#0047AB
#4169E1Blended: #2158C6#0047AB
Quick Answer

Royal Blue (#4169E1) and Cobalt Blue (#0047AB) are similar colors often confused. They differ in brightness, saturation, and undertone, making each better suited for different design contexts.

Key Differences

Aspect Royal Blue Cobalt Blue
BrightnessDark — feels deep, rich, groundedLight — feels airy, bright, lively
SaturationMuted — more subdued, restrainedVivid — more colorful, eye-catching
WarmthCooler — leans more toward blueWarmer — leans slightly toward green
MoodSophisticated, calm, professionalPlayful, energetic, tropical
Best forCorporate branding, interiors, formal designSummer themes, jewelry, casual/fun design
CSS nameteal (built-in)turquoise (built-in)

Can you use them together?

Cobalt Blue text on Royal Blue
Royal Blue text on Cobalt Blue
Contrast Ratio:1.74:1Insufficient Contrast

When to use each

Use Royal Blue for:
●Corporate websites and branding
●Elegant interior design
●Professional presentations
●Dark-mode friendly UI elements
●Formal event invitations
Use Cobalt Blue for:
●Summer and tropical themes
●Children's products and toys
●Beach and travel branding
●Jewelry and gemstone marketing
●Bright, energetic social media posts

Full Color Details

Royal Blue#4169E1

Teal is a deep blue-green color named after the Eurasian teal bird. It's widely used in web design, fashion, and interior decor for its calming, sophisticated quality.

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Cobalt Blue#0047AB

Turquoise is a brighter, more vibrant blue-green named after the gemstone. It's lighter and more energetic than teal, evoking tropical waters, summer, and playfulness.

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FAQ

What is the difference between royal blue and cobalt blue?+
Royal Blue (#4169E1) and Cobalt Blue (#0047AB) are similar colors often confused. They differ in brightness, saturation, and undertone, making each better suited for different design contexts.
Is royal blue darker than cobalt blue?+
Yes. Royal Blue (#4169E1) is significantly darker than Cobalt Blue (#0047AB). Royal Blue has a lightness of 57% in HSL, while Cobalt Blue has 34% lightness.
Can you use royal blue and cobalt blue together?+
Yes, they can work well together in a monochromatic or analogous palette since they're both blue-green colors. Their contrast ratio is 1.74:1. Use royal blue as the dominant/darker color and cobalt blue as the accent or highlight.
What is the hex code for royal blue?+
The hex code for Royal Blue is #4169E1. In RGB, that's rgb(65, 105, 225).
What is the hex code for cobalt blue?+
The hex code for Cobalt Blue is #0047AB. In RGB, that's rgb(0, 71, 171).