Watch Series 6 44 mm

While visually similar to its predecessor, the Apple Watch Series 6 features a faster architecture, an always-on altimeter, and a Blood Oxygen (SpO2) sensor. This is the GPS-only model in a 44 mm aluminum case, which requires an iPhone 6s or later with iOS 14 or newer for full functionality. It includes a Digital Crown with haptic feedback. This 44 mm model has a 368x448 LTPO OLED screen with Ion-X glass and a ceramic and sapphire crystal back. Battery life is estimated at up to 18 hours. It was available in five standard aluminum finishes. A limited-edition "Black Unity" model with unique laser-etching and a special band was also introduced on January 26, 2021.

The 44mm model earned high praise as a comprehensive fitness tracker through improved visibility from its larger screen and new health features. Blood oxygen sensors and ECG functionality provided comprehensive health monitoring support, while Apple Fitness+ integration enhanced workout experiences. Although some battery life limitations existed, daily usage proved sufficient with overall satisfaction ratings remaining high.