Apple Watch Ultra 4 In-Depth Review: As Good As the Hype?

Let's talk about the accuracy of the Apple Watch Ultra 4, and whether or not it lives up to the hype around the optical HR sensor. There's a lot to unpack here.

Here's the full written review: dcrainmaker.com/2026/09/apple-watch-ultra-4-in-depth-review.html

0:00 Quick Overview & Review Game Plan
0:29 The Case Hardware
0:53 New S11 Chipset
1:15 New Optical Heart Rate Sensor Changes
2:26 Heart Rate Update Changes
2:50 Expanded HRV Tracking (Nightly)
3:06 Updated Vitals HRV Trending
4:19 Daytime HRV Explained
6:05 New Readiness Score
6:59 Readiness Changes over 24 hours
9:06 Apple's Heart Rate Accuracy Study Explained
13:09 Real-World Heart Rate Accuracy Testing
16:24 GPS Accuracy Real World Testing
17:40 Battery Life & Extended/Max GPS Modes
18:58 New Apple Health App Features
19:44 Audio Intelligence - Sound Recognition & Instant Shazam
21:10 Audio Intelligence - Live Rewind & Siri Recap
23:37 Pricing, New Bands & Final Recommendations