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

The main difference between Royal Blue and Cobalt Blue is brightness and saturation: both are blue shades, but Royal Blue is lighter and Cobalt Blue is more saturated. 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.

Royal Blue#4169E1
Cobalt Blue#0047AB
#4169E1Blended: #2158C6#0047AB
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Royal Blue vs Cobalt Blue: Key Differences at a Glance

Aspect Royal Blue Cobalt Blue
BrightnessMedium (L=57%) — balanced, versatileDark (L=34%) — rich, serious, substantial
SaturationVivid (S=73%) — bright, energetic, eye-catchingVivid (S=100%) — bright, energetic, eye-catching
Hue familyBlueBlue
TemperatureCoolCool
Hex code#4169E1#0047AB
RGB65, 105, 2250, 71, 171

Can you use Royal Blue and Cobalt Blue together?

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

How to Tell Royal Blue and Cobalt Blue Apart

  • ●Look at lightness first: Royal Blue is noticeably lighter.
  • ●Check saturation: Cobalt Blue looks more vivid and saturated.
  • ●Watch the undertone: the hue shifts 10° between them, which changes the perceived temperature.
  • ●Compare them on a white background to see true saturation, and on black to see true lightness.

Royal Blue or Cobalt Blue: Which to Use and Where

Four real design scenarios, with the recommended pick based on hue, saturation, and WCAG contrast.

◆Branding & logos
PickCobalt Blue

Cobalt Blue is more saturated (100% HSL vs 73%) so it reads as bolder and more memorable at logo scale, while Royal Blue can feel washed out when printed small.

▢Web UI & body text backgrounds
PickCobalt Blue

Cobalt Blue hits a 8.44:1 WCAG contrast against white — safer for text-heavy interfaces — where Royal Blue only reaches 4.85:1 and risks failing AA at small body sizes.

⬡Fashion & apparel
PickRoyal Blue

Royal Blue is a cool-leaning tone that flatters spring/summer collections and warmer skin undertones, while Cobalt Blue leans cooler and is better suited to autumn/winter layering.

▣Interior design & walls
PickRoyal Blue

Royal Blue is the more muted of the two (73% saturation) and sits more calmly on large wall surfaces, while Cobalt Blue's higher chroma can overwhelm a room when used beyond accent pieces.

When to Use Royal Blue vs Cobalt Blue in Design

Use Royal Blue for:
●Tech and corporate trust
●Finance and banking brands
●Links and primary buttons
●Medical and professional UI
●Calm dependable visuals
Use Cobalt Blue for:
●Tech and corporate trust
●Finance and banking brands
●Links and primary buttons
●Medical and professional UI
●Calm dependable visuals

Royal Blue and Cobalt Blue Hex Codes, RGB & HSL

Royal Blue#4169E1

Royal Blue (#4169E1) is a medium, vivid blue with a cool undertone — it feels balanced, versatile and bright, energetic, eye-catching.

HEX
RGB
HSL
HSV
CMYK
PANTONE
Shades
Tints
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
Shades
Tints

Royal Blue and Cobalt 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
Royal Blue text on white
4.85:1AA
Sample text preview
Royal Blue text on black
4.33:1AA Large
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
Royal Blue text on Cobalt Blue
1.74:1Fail
Sample text preview
Cobalt Blue text on Royal Blue
1.74:1Fail

Explore Royal Blue and Cobalt Blue individually

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

Royal Blue color page#4169E1 · shades, tints, pairingsCobalt Blue color page#0047AB · shades, tints, pairings

More Royal Blue and Cobalt Blue Comparisons

NavyvsRoyal BlueNavyvsCobalt BlueBluevsRoyal BlueCobalt BluevsCeruleanCobaltvsRoyal BlueCharcoalvsCobalt BlueRoyal BluevsIndigoCobalt BluevsSky BlueSapphirevsRoyal BlueCobalt BluevsGunmetalSky BluevsRoyal BlueNavy BluevsCobalt Blue

Royal Blue vs Cobalt Blue FAQ

What is the difference between royal blue and cobalt blue?+
The main difference between Royal Blue and Cobalt Blue is brightness and saturation: both are blue shades, but Royal Blue is lighter and Cobalt Blue is more saturated. 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?+
No. Cobalt Blue is the darker of the two at 34% lightness, while Royal Blue sits higher at 57%.
Are royal blue and cobalt blue the same color?+
No. Royal Blue is #4169E1 and Cobalt Blue is #0047AB. They differ by 10° in hue, 23% in lightness, and 27% in saturation.
Which is more saturated, royal blue or cobalt blue?+
Cobalt Blue is more saturated. In HSL, Royal Blue has 73% saturation and Cobalt Blue has 100% — Cobalt Blue is the more vivid of the two, while Royal Blue reads as more muted.
Is royal blue warm or cool?+
Royal Blue (#4169E1) is a cool blue. Its hue sits at 225° on the color wheel, which places it in the cool range.
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.
Can you use royal blue and cobalt blue together?+
Yes. Both royal blue and cobalt blue are blue shades, so they pair naturally in a monochromatic palette. Use cobalt blue as the dominant color and royal blue as the accent or highlight.
What color family does royal blue belong to?+
Royal Blue belongs to the blue family. Its HSL is 225°, 73%, 57% — a cool tone within the broader blue group.
What is the hex code for royal blue?+
The hex code for Royal Blue is #4169E1. In RGB, that's rgb(65, 105, 225), and in HSL it's hsl(225, 73%, 57%).
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%).