Can I use the Apple San Francisco Font?

>able to market the application with this Font.

No. SF is a system font only.

Use extends to creating mock ups exclusively for testing.

See the readme included with the download.

I think you might need to be more specific.

If you're creating an app for a non-Apple device, then you can't use San Francisco font.

However, if you're creating an app on an Apple device (e.g. iPhone, iPad, Apple Watch, Apple TV), then use the System font and it will use San Francisco font. Also, when you use the system font APIs, it will automatically pick the correct Text or Display versions (technically "optical size variants") depending on the font size used.

See also

UIFont.preferredFont(forTextStyle style:)
UIFont.systemFont(ofSize:)

Hope this answers your question.

Doug Hill
https://github.com/djfitz/SFFontFeatures

Hi Doug, Wondering if you can follow up here ... does the same apply for Mac apps? Can they use SF fonts directly, for a (paid) Mac app? Thanks.