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Jacob Bulbul

Jacob Bulbul

Former Software Engineer

Jacob Bulbul is a former Software Engineer at Terra API. Published articles compare wearable sleep, heart rate, and heart rate variability data.

Jacob Bulbul

About

Jacob Bulbul is a former Software Engineer at Terra API. Contributions to Terra’s blog examine data from wearable devices and connected fitness products.

Published articles compare sleep stages, heart rate, and HRV across devices from Apple, Oura, Polar, Garmin, WHOOP, and Eight Sleep. Other contributions cover wearable sensors and measurement frequencies.

Blog

Sleep Stage Comparisons: Apple Watch vs. Polar Unite

8 November 2022

Apple vs Oura: Sleep Stage Comparisons

31 October 2022

Sleep Stage Comparison: Oura vs. Polar

25 October 2022

HRV Comparisons: Apple Watch vs. Oura Ring

13 October 2022

HRV Comparison: Eightsleep vs. Whoop

28 September 2022

HRV Comparison: Oura vs Whoop

23 September 2022

HRV Comparisons: Eightsleep vs Garmin

12 September 2022

The new Apple Watch Ultra: Sensors and Data

8 September 2022

List of HR and HRV Measurement Frequencies for all Wearables

7 September 2022

HRV comparison: Polar vs. Oura Ring 3

29 August 2022

Polar Unite vs. Oura Ring 3 for Heart Rate Sleep Tracking

24 August 2022

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