The Apple Watch series was off to a shaky start when it was first released in 2015, but Apple did what Apple does and with multiple revisions and updates, it has perfected the smartwatch formula with a device that not only looks beautiful and feels snappy, but also has one of the most reliable heart rate sensors and that keeps on getting new health and fitness features over time.
In this article, we explore the major new features that Apple introduced with each new Apple Watch, and the little differences that built up over time.
