…Avenir Next. It looks like this:
Click to enlarge image above
(That’s Ulysses, my new favorite writing app.)
Avenir is a pretty smooth font, too:

Adrian Frutiger designed them both. You can read more about the Avenir font family here.
Like this:
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Published by Abram K-J
I am a husband and father, a pastor, a runner, a writer, an editor, and a reviewer of cool stuff.
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But don’t serifs help your eyes to track along the text, making for a smoother reading experience?
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I hadn’t paid much attention, but I suppose so.