With the all-new Health Sensing System as its central pillar and the powerful S11 processor, Apple’s new watches promise the most accurate health and fitness tracking ever seen in a wearable device. 

Let’s take a detailed look at what they bring.

Apple Watch Series 12: The ultimate health ally

The Series 12 redefines the way the watch understands our body, bringing features that users have been asking for for years.

• Health Sensing System: Equipped with new optical and electrical sensors (with larger and more efficient green LEDs), it now measures heart rate every 5 seconds, all day long! At the same time, heart rate variability (HRV) is measured 24 times more often.

• New Readiness Score: The watch now analyzes your recent activity, sleep, and vital signs to give you a “Readiness” score (from 0 to 10). Every day it clearly advises you: Recover, Pace Yourself, Ready, or Go For It, so you know whether you should push yourself or rest.

• Powerful S11 Chip: The new processor not only brings Apple Intelligence (and the new Siri AI) through watchOS 27, but also supports new Audio Intelligence features, helping users isolate important sounds and speech around them. It also offers the most accurate step tracking (pedometer) ever seen in a smartwatch.

• Battery & Charging: Daily battery life remains at 24 hours, but it now lasts up to 10 hours of continuous outdoor exercise (+25%). Charging is ultra-fast: just 15 minutes plugged in gives you 12 extra hours of use!

• Materials & Colors: It comes in a refreshed Aluminum palette (with brand-new Ceramic Shield 2 glass, 60% more durable), in striking Titanium, and in a luxurious Ceramic material edition (in Pearl White and Night Blue).

Apple Watch Ultra 4: The "beast" of extreme sports

For athletes and adventure lovers, the Apple Watch Ultra 4 remains the undisputed king, incorporating all the new health technologies of the Series 12, but tuned for extremes.

• Absolute Accuracy & GPS: It also features the new Health Sensing System and the S11 chip, providing the new Readiness score to athletes, while combining it with the most accurate built-in GPS available in a sports watch.

• Battery for Marathons: Designed to withstand the toughest conditions, the Ultra 4 now offers extended battery life that can record outdoor workouts for up to 45 continuous hours! For simple everyday use, its battery lasts more than 2 days.

• Build: It retains its rugged and durable character, and comes in two premium Titanium options: Natural Titanium and the highly sought-after Black Titanium.

This article was created with the help of AI and reviewed and edited by the Skroutz team.