Apple Watch Ultra 4

Apple Watch Ultra 4 Product Description

The Apple Watch Ultra 4 is Apple’s most advanced sports and adventure smartwatch, engineered for athletes, outdoor enthusiasts, divers, and professionals who demand maximum durability, accuracy, and battery life. It features the new S11 chip, an upgraded Health Sensing System with the most accurate heart rate sensing in a wearable, a new Readiness score, up to 50 hours of battery life (84 hours in Low Power Mode), a 49mm titanium case, a bright Always‑On Retina display, dual‑frequency GPS, 5G cellular, satellite connectivity, and comprehensive dive and water sports support.

Built to handle extreme conditions while delivering deep health insights and intelligent audio features, the Apple Watch Ultra 4 combines rugged design, pro-level fitness tracking, and seamless integration with iPhone and the Apple ecosystem.

Reasons To Buy

• S11 chip for faster performance and efficiency
  New Apple S11 chip delivers quicker app launches, smoother workouts, more advanced on-device processing, and better power efficiency compared to the S10 in Ultra 3.
• Health Sensing System with best-in-class heart rate accuracy
  Third-generation electrical heart sensor and always-on optical heart sensor provide higher-frequency heart rate and HRV measurements, enabling more accurate training zones, recovery insights, and health monitoring.
• New Readiness score
  Readiness app combines sleep, heart rate variability, recent activity, and other metrics into a simple daily score to help you decide when to push hard or prioritize recovery.
• Up to 50 hours of battery life
  Up to 50 hours of normal use and up to 84 hours in Low Power Mode support multi-day adventures, long expeditions, and heavy training blocks without daily charging.
• Up to 45 hours Max Extended Workout mode
  Max Extended Workout mode with second-by-second GPS tracking lasts up to 45 hours for ultra-endurance runs, hikes, and rides, 25% longer than Ultra 3.
• Faster charging with more runtime per charge
  A quick 15-minute charge provides up to 18 hours of runtime (50% more than Ultra 3), making it easier to top up before long days or overnight trips.
• 49mm titanium case with premium durability
  Aerospace-grade titanium case, sapphire crystal front, and reinforced design meet MIL-STD 810H standards for shock, temperature, and environmental resistance.
• Bright Always‑On Retina display
  Wide-angle LTPO3 OLED Always‑On Retina display reaches up to 3,000 nits peak brightness for excellent outdoor visibility, with 1 nit minimum for dark environments.
• Precision dual-frequency GPS and 5G + satellite
  Dual-band GPS (L1+L5) with multi-constellation support, 5G RedCap cellular, and satellite features (Emergency SOS, Messages, Precision Finding) keep you connected and trackable in remote areas.
• Pro dive and water sports support
  WR100 water resistance, recreational scuba diving to 40 meters (EN13319), depth gauge (±1m accuracy), water temperature sensor, and dedicated dive apps support serious underwater activities.

Ideal Users

• Endurance athletes (runners, cyclists, triathletes) who need long GPS battery life and accurate metrics.
• Outdoor adventurers, hikers, and mountaineers who operate in remote or extreme environments.
• Divers and water sports enthusiasts who want a certified dive watch with advanced sensors.
• Fitness-focused users who want detailed heart rate, HRV, temperature, and readiness insights.
• Professionals and first responders who need rugged hardware, long battery, and reliable connectivity.
• Apple ecosystem users who want the most capable Apple Watch for sports and outdoor use.

Body and Design

The Apple Watch Ultra 4 retains the iconic 49mm titanium case design, measuring approximately 49 × 44 × 12 mm and weighing around 63g (case only). It uses aerospace-grade titanium for strength and light weight, with a flat sapphire crystal front and a protective rear crystal.

The side-mounted Digital Crown and Action button provide easy control even with gloves, while the larger, reinforced case structure improves durability in harsh conditions. Available finishes include Natural Titanium and Black Titanium, paired with a range of Ultra-specific bands (Trail Loop, Alpine Loop, Ocean Band) designed for different sports and environments.

With WR100 water resistance, IP6X dust resistance, and MIL-STD 810H certification, the Ultra 4 is built to withstand shocks, extreme temperatures, high altitudes, and demanding daily wear.

Display

The Ultra 4 features a wide-angle Always‑On Retina display based on LTPO3 OLED technology, with a resolution of 422 × 514 pixels and 326 ppi. The display area is approximately 1,245 mm², offering a large, immersive viewing surface for metrics, maps, and notifications.

Peak brightness reaches up to 3,000 nits for direct sunlight readability, while the 1 nit minimum ensures comfortable viewing in dark environments such as tents, caves, or night runs. The always-on capability lets you glance at time, workout data, and complications without raising your wrist.

Performance and Sensors

Powered by the new Apple S11 chip, the Ultra 4 delivers faster system performance, improved graphics, and enhanced on-device AI for health and fitness features. Memory is doubled to 4GB compared to Ultra 3’s 2GB, supporting more complex workouts, maps, and background tasks.

The Health Sensing System includes:

• Third-generation electrical heart sensor
• Always-on optical heart sensor
• Blood oxygen sensor (where available)
• Wrist temperature sensor (0.01°C accuracy)
• High-g accelerometer, gyroscope, compass
• Always-on altimeter (−500 m to 9,000 m)
• Barometer, ambient light sensor

These sensors enable advanced metrics such as running power, elevation gain, sleep stages, respiratory rate, HRV, and the new Readiness score.

Health and Fitness Features

The Ultra 4 tracks a comprehensive set of health and fitness metrics:

• Continuous heart rate and HRV
• Blood oxygen saturation (regional availability)
• Wrist temperature trends for cycle tracking and recovery
• Sleep stages and sleep duration
• Respiratory rate
• Running power, stride length, ground contact time (with compatible workouts)
• VO₂ max, training load, and recovery insights

The Readiness app synthesizes sleep, HRV, recent activity, and other data into a simple score, helping you decide whether to train hard, take it easy, or focus on recovery.

Dedicated workout profiles support running, cycling, swimming, open-water swimming, strength training, hiking, and multi-sport activities, with customizable views and metrics.

GPS, Connectivity, and Safety

The Ultra 4 uses precision dual-frequency GPS (L1+L5) with support for GPS, GLONASS, GALILEO, BDS, and QZSS, delivering highly accurate route tracking even in dense urban canyons, forests, and mountains.

Connectivity features include:

• 5G RedCap cellular for faster data and calls without iPhone
• Wi‑Fi and Bluetooth 5.3
• Ultra Wideband (UWB) gen2 for Precision Finding and device interactions
• Satellite connectivity for Emergency SOS, Messages, and location sharing in remote areas

Safety features include fall detection, crash detection, Emergency SOS, siren (up to 86 dB), and international emergency calling, making the Ultra 4 a reliable companion in risky environments.

Dive and Water Sports

The Apple Watch Ultra 4 is certified for recreational scuba diving to 40 meters under EN13319, with:

• Depth gauge accurate to ±1 meter
• Water temperature sensor
• Dedicated Dive app with depth, time, and safety metrics
• Support for nitrox and multi-dive logging

It also supports high-speed water sports, swimming, snorkeling, and surf tracking, with automatic workout detection and detailed post-session analysis.

Battery and Charging

Apple rates the Ultra 4 for:

• Up to 50 hours of normal use
• Up to 84 hours in Low Power Mode
• Up to 18 hours of outdoor workout with standard GPS
• Up to 25 hours in Extended Workout mode
• Up to 45 hours in Max Extended Workout mode with second-by-second GPS

Charging is via a magnetic USB‑C fast charger. A 15-minute charge provides up to 18 hours of runtime, and a full charge to 80% takes around 45 minutes. The improved efficiency of the S11 chip and optimized software contribute to longer real-world battery life than Ultra 3.

Software and Ecosystem

The Ultra 4 runs watchOS 27, optimized for the Ultra’s large display and rugged use. Features include:

• Enhanced workout views and metrics
• Improved maps, elevation, and route tracking
• Deeper integration with Fitness+ and Apple Fitness
• Siri AI enhancements for voice-controlled workouts, messages, and reminders
• Audio Intelligence features for clearer calls and media in noisy environments

Tight integration with iPhone, AirPods, and Apple services (Maps, Messages, Music, Apple Fitness+, Apple Health) makes the Ultra 4 a central hub for health, fitness, and communication.

Comparison Table

Table of Specifications