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Cobalt vs Royal Blue: What's the Difference?

The main difference between Cobalt and Royal Blue is brightness and saturation: both are blue shades, but Royal Blue is lighter and Cobalt is more saturated. Cobalt and Royal Blue are often confused but differ in brightness, saturation, and undertone. Cobalt (#0047AB) and Royal Blue (#4169E1) each have distinct characteristics and best uses.

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

Aspect Cobalt Royal Blue
BrightnessDark (L=34%) — rich, serious, substantialMedium (L=57%) — balanced, versatile
SaturationVivid (S=100%) — bright, energetic, eye-catchingVivid (S=73%) — bright, energetic, eye-catching
Hue familyBlueBlue
TemperatureCoolCool
Hex code#0047AB#4169E1
RGB0, 71, 17165, 105, 225

Can you use Cobalt and Royal Blue together?

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

How to Tell Cobalt and Royal Blue Apart

  • ●Look at lightness first: Royal Blue is noticeably lighter.
  • ●Check saturation: Cobalt 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.

Cobalt or Royal Blue: Which to Use and Where

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

◆Branding & logos
PickCobalt

Cobalt 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

Cobalt 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 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's higher chroma can overwhelm a room when used beyond accent pieces.

When to Use Cobalt vs Royal Blue in Design

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

Cobalt and Royal Blue Hex Codes, RGB & HSL

Cobalt#0047AB

Cobalt (#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#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 and Royal 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 text on white
8.44:1AAA
Sample text preview
Cobalt text on black
2.49:1Fail
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 text on Royal Blue
1.74:1Fail
Sample text preview
Royal Blue text on Cobalt
1.74:1Fail

Explore Cobalt and Royal Blue individually

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

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

More Cobalt and Royal Blue Comparisons

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Cobalt vs Royal Blue FAQ

What is the difference between cobalt and royal blue?+
The main difference between Cobalt and Royal Blue is brightness and saturation: both are blue shades, but Royal Blue is lighter and Cobalt is more saturated. Cobalt and Royal Blue are often confused but differ in brightness, saturation, and undertone. Cobalt (#0047AB) and Royal Blue (#4169E1) each have distinct characteristics and best uses.
Is cobalt darker than royal blue?+
Yes. Cobalt is darker, with a lightness of 34% in HSL compared to Royal Blue at 57% — a 23-point gap.
Are cobalt and royal blue the same color?+
No. Cobalt is #0047AB and Royal Blue is #4169E1. They differ by 10° in hue, 23% in lightness, and 27% in saturation.
Which is more saturated, cobalt or royal blue?+
Cobalt is more saturated. In HSL, Cobalt has 100% saturation and Royal Blue has 73% — Cobalt is the more vivid of the two, while Royal Blue reads as more muted.
Is cobalt warm or cool?+
Cobalt (#0047AB) is a cool blue. Its hue sits at 215° on the color wheel, which places it in the cool range.
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.
Can you use cobalt and royal blue together?+
Yes. Both cobalt and royal blue are blue shades, so they pair naturally in a monochromatic palette. Use cobalt as the dominant color and royal blue as the accent or highlight.
What color family does cobalt belong to?+
Cobalt 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?+
The hex code for Cobalt 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 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%).