Apple just launched the Apple Watch Series 10 — here's how it compares to previous models and how to order

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Apple officially announced the Apple Watch Series 10 and a design update to the Apple Watch Ultra 2 during its "Glowtime" event on September 9.

The Series 10 is the latest model in Apple's flagship smartwatch lineup, which started in 2015. Both the Series 10 and a new satin black Ultra 2 are available to preorder now ahead of a September 20 release date.

Apple touted the Apple Watch Series 10 as having the lineup's "biggest display and thinnest design" to date. It also comes in a new titanium frame option and offers a new feature for detecting sleep apnea, among other upgrades that should make it one of the best Apple Watches to date. 

Apple Watch Series 10: Release date and price

The Apple Watch Series 10 and the refreshed Apple Watch Ultra 2 are available to preorder now from Apple's website. Both will be fully available on September 20. 

The Series 10 starts at $399 in aluminum and $699 in titanium, while the Ultra 2 starts at $799. 

Apple Watch Series 10: New features

The Apple Watch Series 10 is available in a larger size than the Apple Watch Ultra 2, with 30% more screen area than the previous generation Series 9. It's also 9.7mm thick, which is nearly 10% slimmer than the Series 9. The display glass rounds further down toward your wrist, and the display has a rounder aspect ratio. 

The case on the Series 10 continues to be made of aluminum with three color options, including a shiny polished Jet Black, Warm Rose Gold, and Silver Aluminum. Apple says the Series 10 is up to 10% lighter than the previous generation. 

A new titanium option is replacing the stainless steel options from previous Apple Watch generations. It weighs almost 20% less than the steel models and comes in Natural, Gold, and Dark Slate Gray. Apple has also updated the Milanese Loop to match the titanium finishes. 

Apple gave the Series 10 a new wide-angle OLED display that is 40% brighter and easier to read around the edges when you glance at your watch from an angle. The Series 10's display has also been upgraded to animate the seconds hand even when your wrist is down.

All Apple Watch Series 10 models run on Apple's new S10 processor to support new features, like suppressing background noise during a phone call. It also enables a new Sleep Apnea detection feature by measuring breathing disturbances. 

Apple has also finally enabled the Series 10 to play media from the redesigned speaker so you can listen to music or podcasts when your phone isn't nearby.