Akinori Machino, writing for Medium, digs into the details of the San Francisco font. There are just a ton of fascinating details here. Just one tiny example:
[In other fonts], a colon will be placed right above the baseline, so it’s not vertically centered if it is placed between numbers. San Francisco fonts, on the other hand, will make it vertically centered automatically.
Great stuff. Apple’s constant attention to tiny details continues to amaze me.
The one tiny detail they forgot is to make it readable. Various combinations of letters, and numbers and letters, are so jammed together it’s sometimes difficult to read (not to mention they lowered the contrast, like on the menu bar in El Capitan, AGAIN). I guess Jony is just making things as thin as possible.
Writing FOR Medium, or writing ON Medium?