Watch Series 8 41mm vs Watch SE 2nd Gen 40mm

The Apple Watch Series 8 and Watch SE (2nd gen) were both released on the same day, but the Series 8 has several features not available on the SE (2nd gen).

The Series 8 unique features include an always-on mode for the display, a U1 ultra-wideband chip, a temperature sensor, a blood oxygen sensor, an electrical heart sensor, a third-generation optical heart sensor, an ECG app, an IP6X rating for dust resistance, fast-charging, and 41mm and 45mm case sizes. In comparison, the SE (2nd gen) unique features include a second-generation optical heart sensor and 40mm and 44mm case sizes.

Common features and specs shared by the Watch Series 8 and the Watch SE (2nd gen) include a Retina display, an S8 SiP with a 64-bit dual-core processor, a W3 wireless chip, a Digital Crown with haptic feedback, high and low heart rate notifications, irregular rhythm notification, International emergency calling, Emergency SOS, Crash Detection, Fall Detection, water-resistance to 50 meters, WiFi (802.11b/g/n), Bluetooth 5.3, GPS/GNSS, a compass, an always-on altimeter, a built-in speaker and microphone, and 32GB of storage space.