Replace Helvetica Neue on your 10.10 Yosemite Mac with San Francisco – the Watch font.

The font is adapted from San Francisco Display – Apple’s new typeface for the Apple Watch. This project was inspired by jenskutilek’s Fira System Font Replacement.

1. Download the zipped font files.
2. Copy the 5 font files to ~/Library/Fonts on your Mac. (protip: press cmd+shift+g while in Finder to type the path directly.)
3. Log out and log back in to apply the changes.

1. Navigate to ~/Library/Fonts on your Mac and delete the 5 files starting with System San Francisco Display.
2. Log out and log back in to apply the changes.

These San Francisco fonts have a special name table with names identical to those of the system fonts. Because the font folder /Library/Fonts takes precedence over the fonts which are in /System/Library/Fonts, these specially crafted fonts are used for the user interface instead of the real system fonts. The original system fonts are not deleted or modified in any way.

I assume no copyright over these fonts, nor any liability for improper installation or improper use. Use of these fonts should conform to Apple’s express copyright and rules.