GoKawiilApple Watch Series 12's compact Heart Rate complication now shows live readings
Apple's marketing materials for the Apple Watch Series 12 and Ultra 4 reveal that the small circular Heart Rate complication, previously just an app-launcher icon, will now display an actual live heart rate number. This upgrade is enabled by the new Health Sensing System, which measures heart rate every five seconds—60 times more often than earlier Apple Watch models. The feature does not appear on watchOS 27's release candidate for the older Series 11 and Ultra 3, suggesting it's tied to new hardware.
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Faster, more frequent heart rate sampling lets Apple surface real-time data in spaces that previously couldn't hold it, improving at-a-glance health monitoring without requiring users to open a full app. It's a small interface tweak, but it reflects how hardware sensor upgrades can quietly reshape everyday software interactions, and it may pressure competitors to match both the sensing speed and the UI refinement.
- Series 12 and Ultra 4's small Heart Rate complication now shows a live number instead of just an app icon.
- The change is powered by a new Health Sensing System that reads heart rate every five seconds, a 60x speed boost.
- Older models like Series 11 and Ultra 3 don't get this complication upgrade even on the latest watchOS 27 release candidate.
Apple Watch Ultra 2 — If the article's heart-rate complication talk has you eyeing a new wearable, the Apple Watch Ultra 2 is the rugged flagship option with a big, bright display that makes glanceable complications easy to read. It's a great pick for tracking workouts, heart rate, and daily activity right from your wrist.
See Apple Watch Ultra 2 on Amazon → Affiliate link — we may earn a commission on purchases, at no extra cost to you. Product picked by AI based on this article; it is not a tested recommendation.Source: 9to5mac.com — Zac Hall, 2026-09-11
Published there as: “Apple Watch Series 12 makes a big change to a small complication that I’m excited about”
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