Why serif headlines outperform sans on landing pages — sometimes.

For years the default was: sans-serif everywhere. Helvetica, Inter, anything geometric. It read as "modern," "tech," "trustworthy." Serif was for newspapers and law firms.

Then we ran a few tests. The results pushed back on that default.

Serif isn't old. Serif is editorial. And editorial is what people slow down to read.

Test 1 — Dental clinic homepage

Same layout, two headlines. Version A in Inter. Version B in Fraunces. Everything else identical.

Result: Version B (serif) increased booking-form completions by 14% over a four-week window. Not gigantic, but real, with significance at 95%.

Hypothesis: in healthcare, serif reads as careful, established, considered. Sans reads as a startup. People don't want a startup dentist.

Test 2 — Fintech (prop trading)

Same setup. Headline in Inter vs. headline in serif (Fraunces). Result: serif lost by 6%. Sans-serif won.

Hypothesis: in fintech, sans reads as data-driven, precise, technical. Serif reads as marketing-y. The audience wants the numbers, not the editorial flourish.

Test 3 — SaaS marketing site

Headline in geometric sans vs. serif. Result: tie. Roughly equal sign-up rate. The difference disappeared in the noise.

Hypothesis: at this point in SaaS aesthetics, both choices feel "normal." Neither is a clear signal.

The pattern

Serif wins when the buyer is slowing down to evaluate. Healthcare, professional services, premium goods, real estate. Anything where the decision is "do I trust this person with something important."

Sans wins when the buyer is scanning for capability. Fintech, productivity tools, technical infrastructure. Anything where the decision is "can this do the job."

It ties when the buyer is somewhere in between, or when the brand voice does the heavy lifting either way.

What to do with this

Don't pick a font from a trend article. Pick based on the cognitive mode your buyer is in when they land.

If you're not sure: ship both, run two weeks, look at the data. Most landing pages don't get enough traffic to test conclusively — in that case, default to whichever feels right for the kind of decision your customer is making.

Want a font opinion on your current site? Send us the URL and we'll send a one-screen audit.