The new operating system updates the messaging app as well, adding enlarged emojis, inline previews of videos and links, and the ability to respond to a message with a heart, thumbs up or other icon.

We gave Sierra a spin in June and found most of its features to be intuitive and handy. However, that was an early build and we weren't able to try out auto-unlock (which opens your Mac from an Apple Watch), Apple Pay on the web and some of the features that work alongside iOS 10.

Click here to catch all the latest news from the Apple's "See You" event.