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Cobalt Blue vs Sky Blue: What's the Difference?

The main difference between Cobalt Blue and Sky Blue is hue — Cobalt Blue is a cool blue, while Sky Blue is a cool cyan. Cobalt Blue (#0047AB) has an HSL of 215°, 100%, 34%, whereas Sky Blue (#87CEEB) sits at 197°, 71%, 73%.

Cobalt Blue#0047AB
Sky Blue#87CEEB
#0047ABBlended: #448BCB#87CEEB

Cobalt Blue vs Sky Blue: Key Differences at a Glance

Aspect Cobalt Blue Sky Blue
BrightnessDark (L=34%) — rich, serious, substantialLight (L=73%) — airy, soft, approachable
SaturationVivid (S=100%) — bright, energetic, eye-catchingVivid (S=71%) — bright, energetic, eye-catching
Hue familyBlueCyan
TemperatureCoolCool
Hex code#0047AB#87CEEB
RGB0, 71, 171135, 206, 235

Can you use Cobalt Blue and Sky Blue together?

Sky Blue text on Cobalt Blue
Cobalt Blue text on Sky Blue
Contrast Ratio:4.84:1WCAG AA Pass ✓

How to Tell Cobalt Blue and Sky Blue Apart

  • Look at lightness first: Sky Blue is noticeably lighter.
  • Check saturation: Cobalt Blue looks more vivid and saturated.
  • Watch the undertone: the hue shifts 18° between them, which changes the perceived temperature.
  • Compare them on a white background to see true saturation, and on black to see true lightness.

When to Use Cobalt Blue vs Sky Blue in Design

Use Cobalt Blue for:
Tech and corporate trust
Finance and banking brands
Links and primary buttons
Medical and professional UI
Calm dependable visuals
Use Sky Blue for:
Cool, techy, digital branding
Water, ice, cleaning products
Fresh modern UI accents
Summer and tropical themes
Youthful playful design

Cobalt Blue and Sky Blue Hex Codes, RGB & HSL

Cobalt Blue#0047AB

Cobalt Blue (#0047AB) is a dark, vivid blue with a cool undertone — it feels rich, serious, substantial and bright, energetic, eye-catching.

HEX
RGB
HSL
HSV
CMYK
PANTONE
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Sky Blue#87CEEB

Sky Blue (#87CEEB) is a light, vivid cyan with a cool undertone — it feels airy, soft, approachable and bright, energetic, eye-catching.

HEX
RGB
HSL
HSV
CMYK
PANTONE
Shades
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Cobalt Blue and Sky Blue WCAG Contrast Ratios

Text legibility depends on the contrast ratio between foreground and background. WCAG 2.1 AA requires at least 4.5:1 for normal text and 3:1 for large text; AAA requires 7:1. Use these numbers to choose accessible combinations for your design.

Sample text preview
Cobalt Blue text on white
8.44:1AAA
Sample text preview
Cobalt Blue text on black
2.49:1Fail
Sample text preview
Sky Blue text on white
1.74:1Fail
Sample text preview
Sky Blue text on black
12.06:1AAA
Sample text preview
Cobalt Blue text on Sky Blue
4.84:1AA
Sample text preview
Sky Blue text on Cobalt Blue
4.84:1AA

Explore Cobalt Blue and Sky Blue individually

Each color has a dedicated page with shades, tints, CSS name, pairings, and color psychology.

Cobalt Blue color page#0047AB · shades, tints, pairingsSky Blue color page#87CEEB · shades, tints, pairings

More Cobalt Blue and Sky Blue Comparisons

Cobalt Blue vs Sky Blue FAQ

What is the difference between cobalt blue and sky blue?+
The main difference between Cobalt Blue and Sky Blue is hue — Cobalt Blue is a cool blue, while Sky Blue is a cool cyan. Cobalt Blue (#0047AB) has an HSL of 215°, 100%, 34%, whereas Sky Blue (#87CEEB) sits at 197°, 71%, 73%.
Is cobalt blue darker than sky blue?+
Yes. Cobalt Blue is darker, with a lightness of 34% in HSL compared to Sky Blue at 73% — a 39-point gap.
Are cobalt blue and sky blue the same color?+
No. Cobalt Blue is #0047AB and Sky Blue is #87CEEB. They differ by 18° in hue, 39% in lightness, and 29% in saturation.
Which is more saturated, cobalt blue or sky blue?+
Cobalt Blue is more saturated. In HSL, Cobalt Blue has 100% saturation and Sky Blue has 71% — Cobalt Blue is the more vivid of the two, while Sky Blue reads as more muted.
Is cobalt blue warm or cool?+
Cobalt Blue (#0047AB) is a cool blue. Its hue sits at 215° on the color wheel, which places it in the cool range.
Is sky blue warm or cool?+
Sky Blue (#87CEEB) is a cool cyan. Its hue sits at 197° on the color wheel, which places it in the cool range.
Can you use cobalt blue and sky blue together?+
Yes. Cobalt Blue (blue) and Sky Blue (cyan) can work as a complementary or analogous pair. Use one as the dominant tone and the other as a 10–20% accent to keep the palette balanced.
What color family does cobalt blue belong to?+
Cobalt Blue belongs to the blue family. Its HSL is 215°, 100%, 34% — a cool tone within the broader blue group.
What is the hex code for cobalt blue?+
The hex code for Cobalt Blue is #0047AB. In RGB, that's rgb(0, 71, 171), and in HSL it's hsl(215, 100%, 34%).
What is the hex code for sky blue?+
The hex code for Sky Blue is #87CEEB. In RGB, that's rgb(135, 206, 235), and in HSL it's hsl(197, 71%, 73%).