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Apple Watch Ultra 4 Review - Wear Test of the $799 Smartwatch (opens in a new tab)

menshealth.com · 2026-09-17

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We couldn't match the article's details against the peer-reviewed literature closely enough. The study may be paywalled, very new, or not indexed.

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and 11 more considered

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Claim 1 of 5Not checkedThe Apple Watch Ultra 4 introduces a new Health Sensing System that improves heart-rate tracking and ECG contact area, and the same system also appears in the Apple Watch Series 12.View evidenceHide evidence

As statedheart rate updated every five seconds

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NewsLink could not identify one source study, so this claim was not compared against a paper.

Claim 2 of 5Not checkedApple says the Ultra 4 and Series 12 have the most accurate heart-rate sensing in any wearable, citing a 1,000-plus subject study comparing them against Garmin, Whoop, Google, Samsung, and Oura using a Polar chest strap as reference.View evidenceHide evidence

As stated1,000-plus subject study

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Claim 3 of 5Not checkedThe reviewer says the Ultra 4's battery life met Apple's claims, lasting through two nights of sleep on the first charge cycle and charging much faster than before.View evidenceHide evidence

As statedup to 50 hours of power; 15 minutes of charge time equals up to 18 hours of use

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Claim 4 of 5Not checkedThe article says the Ultra 4 adds new HRV-related features, including Recovery HRV and Readiness, and that other Health app features such as a longevity tab and Health Age score will arrive later.View evidenceHide evidence

As stated1 to 10 Readiness score

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Claim 5 of 5Not checkedThe reviewer concludes that buyers choosing between the Ultra 4 and Series 12 should mostly base the decision on battery life, form factor, and price, since their functionality is now largely similar.View evidenceHide evidence

As stated$399 Series 12 vs $799 Ultra 4

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PubMed, Crossref, Europe PMC · 15 candidate papers

Candidate

Comparison of Heart Rate Monitoring Accuracy between Chest Strap and Vest during Physical Training and Implications on Training Decisions

Sensors · 2021 · Crossref

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And 10 more candidates considered.