What are the main differences between the Versa 3 and Versa 4 in terms of development

Hardware Improvements

- Button Introduction: The Versa 4 reintroduces a physical button, which was absent in the Versa 3. This button can be customized for various functions, such as accessing Alexa or Fitbit Pay[3][5][9]. The Versa 3, on the other hand, relies on touch controls for navigation.

- Design and Weight: The Versa 4 is lighter and smaller than the Versa 3, making it more comfortable for wearers, especially during sleep[1][3]. Despite being smaller, it maintains the same display size as the Versa 3.

Software Enhancements

- User Interface: The Versa 4 features a simplified user interface, which is easier to navigate. Users can swipe through various tiles for different functions like weather, exercise selection, and sleep score[3].

- Google Integration: The Versa 4 promises future integration with Google apps like Google Wallet and Google Maps, enhancing its smartwatch capabilities beyond the standard Fitbit apps[1][3][5]. This integration is not available on the Versa 3.

Feature Additions

- Sports Modes: The Versa 4 offers 40 sports modes, doubling the 20 modes available on the Versa 3. This makes it more versatile for tracking various workouts[1][5].

- Health and Wellness Features: Both models offer comprehensive health tracking, including heart rate, sleep, and stress monitoring. However, the Versa 4 includes an ECG app and improved SpO2 tracking, providing more detailed health insights[4][5].

- GPS Accuracy: The Versa 4's GPS is more accurate and responsive compared to the Versa 3, enhancing outdoor activity tracking[4].

- Battery Life: The Versa 4 has a slightly longer battery life, lasting up to 7 days compared to the Versa 3's 6 days[4].

Development and SDK

There are no plans for releasing an SDK for the Versa 4, similar to the Sense 2, which limits third-party app development for these devices[7]. This means that both models rely on Fitbit's proprietary software for app support.

In summary, the Versa 4 offers several improvements over the Versa 3, including a physical button, enhanced software, more sports modes, and better health tracking features. However, the Versa 3 remains a strong option for those seeking a reliable fitness tracker without the need for advanced features.