Controversy overshadows solid upgrades

The Series 12 has meaningful improvements like a redesigned health sensing array and new gesture support, but the launch was dominated by debate over two unavailable audio features: Siri Recaps and Live Rewind.

Audio Intelligence features delayed

Siri Recaps and Live Rewind use the watch's microphone to listen to sounds and deliver notifications, transcripts or summaries. Apple says they're private thanks to the S11 chip's Secure Exclave, but they won't arrive until later this year.

Only two audio features available now

Faster Shazam and Sound Recognition are the only Audio Intelligence tools you can test today. The reviewer tested Sound Recognition by setting it to detect alarms, appliance beeps and running water, and it worked quickly and accurately.

Secure Exclave protects audio processing

The S11 chip includes a hardware-isolated Secure Exclave where raw audio is buffered and interpreted. This component enables private audio features and also processes data for the Noise app, which detects dangerous sound levels.

Shazam widget shows songs instantly

Open the smart stack and the Shazam widget displays the title and artist of songs playing around you. The reviewer noticed a small quirk where the widget sometimes stayed stuck on the first song until she closed and reopened the stack.

Ceramic case returns in two colors

Apple brought back the Ceramic case option in white or blue, offering a unique look compared to metallic smartwatches. The aluminum models now feature Ceramic Shield 2 like the iPhone 18 Pro, while titanium and ceramic cases have sapphire crystal displays.

New colors and finishes available

Aluminum comes in dark bronze, black, space gray and light gold. Titanium offers natural and radiant gold finishes. Rose gold is gone this year, which may disappoint fans of the pinkish shade from previous generations.

Health sensing system completely redesigned

Apple increased the surface area and number of diodes, electrodes and LEDs in the heart rate package while packing them more closely together. This boosts accuracy and sampling rates with minimal battery impact.

Heart rate sampling jumps from five minutes to five seconds

Background heart rate measurements now happen every five seconds instead of every five minutes. Heart rate variability readings jump from every two to four hours to every five minutes, providing much more granular data.

New HRV measurement type added

The Series 12 now calculates RMSSD (root mean square of successive differences) in addition to the previous SDNN readings. RMSSD is more useful for quick bursts like during or after workouts, thanks to the increased sampling frequency.

Readiness score joins Sleep Score

Apple added a Readiness app that scores your daily readiness based on sleep, activity and vitals. The feature requires seven nights of baseline data and won't show a score if you miss wearing the watch to bed.

Readiness uses encouraging language

The watch uses phrases like Recover, Pace yourself, Ready or Go for it rather than pushy commands. Even without a score, you can tap the Readiness card to see individual components like fitness, vitals and sleep broken down.

Single-tap gesture is a game changer

The Series 12 adds single-tap to the existing double-tap and wrist flick gestures. This lets you differentiate between taps and actually interact with cards hands-free, making the watch far more functional without touching the screen.

“This one addition is, in my humble opinion, a game changer.”

Dynamic app grid adapts to context

watchOS 27 replaces the full app grid with a smaller selection of larger icons that change based on what the watch thinks you need. The camera app appears when your phone is nearby, and the bedtime app shows in the morning.

Battery life matches Series 11

The Series 12 delivers similar runtime to its predecessor, ending low-activity days around 50 percent battery. It charges faster though, reaching 80 percent in 30 minutes and gaining 12 hours of use in just 15 minutes.

S11 chip powers performance gains

Derived from the A20 Pro in the iPhone 18 Pro, the S11 is Apple's most powerful wearable chip. The Series 12 remained responsive throughout testing with no stutters or lag, and the chip enables features like the new pedometer model.

Health app redesign coming later

Apple is redesigning the Health app with new Longevity and Browse tabs, plus a dynamically organized feed of cards powered by Apple Intelligence. The update wasn't ready for testing but should roll out later this year.

Solid upgrade at the same price

For the same starting price as the Series 11, the Series 12 offers meaningful health improvements, better gesture support and useful new complications. Most new features can be disabled if you don't want them.