What Font Does Apple Use In Their Keynote Presentations -

In a presentation, cold fonts kill connection. Avenir was designed with "humanist" tendencies—it includes subtle irregularities that make it easier for the eye to process. The "a" and the "g" in Avenir are distinctive and friendly. In a stadium setting, where a slide is visible for only seconds, legibility is paramount. Avenir offers high x-heights (the distance between the baseline and the top of lowercase letters), making it incredibly easy to read from the back row.

While San Francisco is the system font for macOS and iOS, using it in your own projects involves specific licensing and tools: what font does apple use in their keynote presentations