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Apple Watch Ultra 4 In-Depth Review: Does Heart Rate and GPS Accuracy Match the Claims?
DC Rainmaker's in-depth review of the Apple Watch Ultra 4 finds its optical heart rate sensor is Apple's best yet, but notes that Apple's white paper only compares timestamps where Apple has data and excludes missing points from error calculations, making the 'most accurate heart rate' claim hard to fully support in real-world scenarios.
The author tests the Apple Watch Ultra 4's optical heart rate and GPS performance across multiple scenarios and breaks down the comparison methodology of Apple's white paper, helping readers judge the credibility of its sports data.
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