This is the largest Apple Watch display yet. It features a new electrical heart sensor and has re-engineered Digital Crown with haptic feedback. Entirely familiar, yet completely new, the Apple Watch Series 4 resets the standard for what a watch can be.
Users now get both low and high heart rate notifications, fall detection, emergency SOS and new Breathe watch faces. These smartwatches are designed to improve your health every day and are powerful enough to also help protect it.
Apple Watch Series 4 provides automatic workout detection, new yoga + hiking workouts, and more advanced features for runners like cadence and pace alerts. See up to five metrics at a glance as you precisely track all your favorite ways to train.
These products feature new head-to-head competitions, activity sharing with friends, personalized coaching, monthly challenges and achievement awards. Get all the motivation you need to close your Activity rings every day.
Apple Series 4 watches come with the Walkie-Talkie feature and can impressively execute phone calls and messages. Apple Music and Apple Podcasts* can also be used with these smartwatches. There are also new ways to use your favorite apps with Siri Shortcuts—they're all there, right on your wrist.
*Apple Music requires a subscription.
Some bands are sold separately.
Apple Watch Series 4 (GPS) requires an iPhone 5s or later with iOS 12 or later. Apple Watch Series 3 (GPS) requires an iPhone 5s or later with iOS 11 or later.
Features are subject to change. Some features, applications, and services may not be available in all regions or all languages. See www.apple.com/watchos/feature-availability for complete list.
 Apple Watch Series 4 |  Apple Watch Series 3 | |
|---|---|---|
| Case Size | 40mm, 44mm | 38mm, 42mm |
| Display Area | 759 sq mm or 977 sq mm display area | 563 sq mm or 740 sq mm display area |
| Case Thickness | 10.7mm | 11.4mm |
| Processor | 64-bit dual-core S4 processor; Up to 2x faster than S3 processor | Dual-core S3 processor |
| Electrical Heart Sensor | Electrical heart sensor (ECG app); ECG app coming later this year | |
| Optical Heart Sensor | Second-generation optical heart sensor | Optical heart sensor |
| Fall Detection |  | |
| Digital Crown | Digital Crown with haptic feedback | Digital Crown |