Apple Watch Ultra 4 Review: Health Upgrades, Longer Battery, Same Price

Overview

The Apple Watch Ultra 4 launched this week at the unchanged price of $799, positioning it as the most rugged and health‑focused smartwatch in Apple’s lineup. Built on the new S11 SiP, the device refines the Ultra formula rather than overhauling its iconic 49 mm titanium case. While the hardware evolution is modest, Apple has layered significant software and sensor upgrades that aim to make the Ultra 4 the best health companion on a wrist.

Design, Build and Core Hardware

Visually, the Ultra 4 is identical to the Ultra 3: a 49 mm titanium case, the same Action button on the left, and full compatibility with existing Ultra bands—including the new Translucent Gray Ocean band that the reviewer praised for its “floating” look. The watch retains an IP6X dust‑proof rating, MIL‑STD‑810H durability, built‑in 5G cellular, satellite connectivity, and a bright 1.98‑inch display.

• Case material: Titanium
• Display size: 1.98 inches
• Connectivity: 5G, satellite, Wi‑Fi, Bluetooth
• Durability: IP6X, MIL‑STD‑810H
• Processor: S11 system‑on‑chip

Health Sensing System (HSS) – What’s New?

Apple’s headline health upgrade is the new Health Sensing System (HSS). The system adds three hardware changes:

• A larger electrode surface for more reliable ECG readings.
• Revamped photodiodes that improve optical sensing through the skin.
• Larger green LEDs that enable continuous heart‑rate monitoring.

These changes let the Ultra 4 record heart‑rate data every five seconds (versus every five minutes on earlier models) and capture heart‑rate variability (HRV) every five minutes instead of every two hours. Apple distinguishes two HRV metrics: recovery HRV (RMSSD) for short‑term stress and overall HRV (SDNN) for longer‑term cardiovascular health.

The watch also introduces a new Readiness Score that aggregates recent sleep, activity and vitals into a 0‑10 scale, plus a redesigned Health app on iOS 27 that adds an Insights tab, a Longevity tab (with health‑age estimates and lab‑test ordering via Quest Diagnostics), and AI‑generated health suggestions powered by Apple Intelligence.

Battery Life and Charging Improvements

Battery endurance is the most tangible day‑to‑day upgrade. Apple advertises up to 50 hours of normal use on a single charge—an eight‑hour jump over the Ultra 3’s 42‑hour claim. In low‑power mode the Ultra 4 reaches 84 hours, compared with 72 hours on the previous model.

Fast charging also sees a boost: a 15‑minute charge with the included 10 W magnetic puck now delivers roughly 18 hours of runtime, up from 12 hours on the Ultra 3. The puck itself (model A3277) looks unchanged, so users with older charging stands may still be limited by the stand’s slower output.

Software – watchOS 27 and the Health App Refresh

watchOS 27 arrives with several quality‑of‑life tweaks:

• Faster Siri AI that answers web queries more reliably.
• Automatic Shazam song identification in the Smart Stacks widget.
• A new “dynamic app grid” that surfaces the five most‑used apps when you tap the Digital Crown.

The Health app redesign, rolled out in the iOS 27.1 developer beta and iOS 27.2 public beta during the past week, adds an Insights tab (showing Readiness Scores and AI‑generated health tips) and a Longevity tab (health‑age, lab‑test ordering). These features are fully functional on the Ultra 4 when paired with an iPhone running iOS 27 that supports Apple Intelligence.

Apple’s much‑talked‑about Audio Intelligence suite—Live Rewind (15‑second audio transcription) and Siri Recap (conversation summarisation)—is not yet available. The company has said the features will land “later this year,” and they are deliberately omitted from the review’s testing.

Spec Comparison: Ultra 4 vs. Ultra 3

Feature	Apple Watch Ultra 4	Apple Watch Ultra 3
Launch price	$799	$799
Processor	S11 SiP	S9 SiP (previous generation)
Battery (normal use)	Up to 50 hours	Up to 42 hours
Battery (low‑power mode)	Up to 84 hours	Up to 72 hours
Fast‑charge (15 min)	~18 hours of use	~12 hours of use
Health sensor upgrades	Larger electrode, revamped photodiodes, larger green LEDs	Standard ECG & optical sensors
Display size	1.98 inches	1.98 inches
Case material	Titanium (49 mm)	Titanium (49 mm)

How It Stacks Up Against Competitors

In the reviewer’s view, the Ultra 4 narrows the gap with rivals that have offered continuous heart‑rate monitoring for years (e.g., Garmin Forerunner 970, Google Pixel Watch 4, Samsung Galaxy Watch 8). The new Readiness and Vitals apps are praised for their simplicity, and the longer battery life makes the Ultra 4 the “longest‑lasting Apple Watch ever.” For Android users, the article recommends looking at the Samsung Galaxy Watch Ultra 2 as the closest ecosystem‑compatible alternative.

Verdict

The Apple Watch Ultra 4 delivers a solid value proposition: the same rugged design and $799 price point, a noticeable battery boost, and a health‑sensor suite that finally matches the continuous monitoring of competing wearables. The biggest drawback is the absence of Audio Intelligence features at launch, which may disappoint early adopters eager for on‑device transcription. Overall, the Ultra 4 is the best health‑focused smartwatch Apple currently offers, especially for iPhone users who can take full advantage of the refreshed Health app and Apple Intelligence.

Frequently Asked Questions (FAQ)

• Q1: What is the launch price of the Apple Watch Ultra 4?

  The Apple Watch Ultra 4 launches at $799, the same price as the previous Ultra generation.

• Q2: How long does the Apple Watch Ultra 4's battery last under normal use?

  Apple advertises up to 50 hours of normal use on a single charge, with low‑power mode extending life to about 84 hours.

• Q3: When will Audio Intelligence features be available on the Apple Watch Ultra 4?

  Apple has said Audio Intelligence features such as Live Rewind and Siri Recap will arrive later in the year; they were not available at the time of the review.