"The Y Combinator-backed company also provides a bunch of other smart and subtle features. A button at the top lets you turn on Facetime with a single swipe. A feature called “thumbkissing” shows your partners thumbprints whenever they’re touching the screen, and both phones will vibrate if your thumbs are on the same place. You can also create shared to-do lists and set reminders for birthdays and anniversaries. A Moments section contains all your shared photos." - × × ×