I tested the Apple Watch Ultra 3 and Garmin Venu 4 on a 7km run, vs a chest-worn heart rate monitorBy otako_fzbgs4 / October 3, 2025 I’m testing the Garmin Venu 4 and the Apple Watch Ultra 3 against the most accurate heart rate monitor on my lunchtime run. Related posts: Apple addresses App Store ruling as Fortnite eyes return Google Messages rolling out ‘Unsubscribe’ button to stop SMS and RCS spam Apple v. Epic: What happens next to the App Store and Fortnite? Apple’s consequential App Store setback comes on the eve of a key event