What are the main differences in heart rate monitoring between the Pixel Watch 3 and the Apple Watch Ultra 2

Heart Rate Monitoring Features

Pixel Watch 3:
- AI-Enabled Loss of Pulse Detection: This unique feature allows the Pixel Watch 3 to detect the absence of a pulse using its multi-path heart rate sensor. If no heart rate is detected after a countdown, it can alert emergency services, making it a potentially life-saving tool[1][2].
- Polling Frequency: The Pixel Watch 3 can poll heart rate every second even when not in workout mode. This high-resolution tracking is beneficial for real-time health monitoring and enhances the effectiveness of the Loss of Pulse detection feature[3][4].
- Sensor Suite: It includes a multi-path optical heart rate sensor, ECG capabilities, and sensors for measuring blood oxygen saturation (SpO2) and skin temperature. The watch also utilizes an improved algorithm for more accurate readings by accounting for arm movement and ground contact during activities[2][5].

Apple Watch Ultra 2:
- Heart Rate Monitoring: While it does not feature Loss of Pulse detection, the Apple Watch Ultra 2 provides robust heart rate monitoring through its optical sensor and ECG functionality. It is known for its reliability and accuracy during workouts[1][5].
- Polling Frequency: The Apple Watch typically updates heart rate data every five minutes when not in workout mode. This lower frequency may limit real-time health insights compared to the Pixel Watch 3's capabilities[3][4].
- Additional Safety Features: The Ultra 2 includes Fall Detection and Crash Detection, which can automatically contact emergency services if a serious incident is detected. These features add an extra layer of safety, although they do not directly relate to heart rate monitoring[1][2].

User Experience and Ecosystem Integration

Pixel Watch 3:
- The watch is deeply integrated with the Fitbit ecosystem, offering personalized health insights through the Fitbit app. Users can access features like Morning Briefs summarizing health metrics and readiness scores, which are enhanced with Fitbit Premium subscriptions[1][2].
- It supports automatic and manual tracking for over 40 workout types, providing detailed feedback on various fitness metrics[2][5].

Apple Watch Ultra 2:
- Designed exclusively for iPhone users, it offers seamless integration with Apple's Health and Fitness apps without requiring additional subscriptions. This integration allows users to access comprehensive health data easily[1][4].
- The watch includes features like Double Tap functionality for quick interactions without touching the display, enhancing user convenience during workouts or daily tasks[1].

In summary, while both smartwatches excel in heart rate monitoring, the Pixel Watch 3 stands out with its innovative Loss of Pulse detection and higher polling frequency. In contrast, the Apple Watch Ultra 2 offers a more traditional yet reliable approach with additional safety features and seamless integration into the Apple ecosystem.