RANK #06 83% MATCH

Roboto Slab × Source Sans 3

serif  +  Body

Source Sans is a clean humanist sans that recedes as calm body under Roboto Slab's slab headings. The slab texture leads, Source Sans carries text neutrally, and the modern, even temperament of both keeps the system cohe...

Headings + Body Google Fonts Free
Open in Studio Copy CSS
Match scores

How Roboto Slab and Source Sans 3 score across four checks — class contrast, role clarity, x-height harmony and mood affinity. Higher is better.

COMPOSITE MATCH
83 /100
Reliable choice
Class contrast 80
Role clarity 86
X-height harmony 84
Mood affinity 84
WHY IT WORKS
Structure meets readability

Source Sans is a clean humanist sans that recedes as calm body under Roboto Slab's slab headings. The slab texture leads, Source Sans carries text neutrally, and the modern, even temperament of both keeps the system cohesive.

Where it shines

Tech, corporate and documentation layouts wanting a sturdy slab heading over a neutral body.

Where to be careful

Keep a clear weight gap so the slab heading stays dominant over the neutral body.

THE TYPEFACES
Meet the pair
Ag HEADING
Roboto Slab
serif · Christian Robertson · 2013
ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz 0123456789 & ?!
WEIGHTS
Thin Light Regular Medium Bold Black
BEST FOR Headlines, labels, UI
Ag BODY
Source Sans 3
Google Fonts typeface
ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz 0123456789 & ?!
BEST FOR Body text, quotes, long reads
GET THE PAIR
Drop it into your project

Add the fonts, then two rules — Roboto Slab for headings, Source Sans 3 for everything you read.

index.html
<link rel="preconnect" href="https://fonts.googleapis.com">
<link href="https://fonts.googleapis.com/css2?family=Roboto+Slab:wght@500;700&family=Source+Sans+3:wght@400;500&display=swap" rel="stylesheet">
styles.css
h1, h2, h3 {
  font-family: "Roboto Slab", sans-serif;
  font-weight: 700;
  letter-spacing: -0.01em;
}

body, p {
  font-family: "Source Sans 3", serif;
  font-weight: 400;
  line-height: 1.7;
}
MORE PAIRINGS
Other ways to use Roboto Slab
All Roboto Slab pairings
Ag × Ag
Roboto Slab + Roboto Slab

This is the safest pairing on the list because the two faces share a skeleton — Roboto Slab is Roboto with slab serifs added. The x-heights...

90% match Rank #01
Ag × Ag
Roboto Slab + Lato

Flip the usual order: Lato's smooth humanist headings over Roboto Slab's even slab body. The slab gives the body more presence than a delica...

85% match Rank #02
Ag × Ag
Roboto Slab + Inter

Roboto Slab's slab headings over Inter's neutral, screen-optimised body is a clean, modern systems pairing — the slab texture leads, Inter's...

85% match Rank #03
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