Series 4 Apr 2026

While it no longer receives the latest watchOS updates, the Series 4 is credited with saving the product line. By prioritizing and screen real estate , Apple moved away from being a "mini-phone" on the wrist and toward being a life-saving tool.

The first over-the-counter wearable to offer a 30-second electrocardiogram. Series 4

The Apple Watch Series 4, released in 2018, remains a landmark in wearable history. It was the first major redesign of the device, shifting it from a "luxury gadget" to a "critical health companion." ⌚ The Modern Face of Apple Watch While it no longer receives the latest watchOS

40mm and 44mm sizes replaced the original 38/42mm. released in 2018

Uses an improved accelerometer and gyroscope to detect hard falls.

A slimmer profile that sits closer to the wrist.