Apple has introduced the Apple Watch Ultra 4, bringing several improvements over the Apple Watch Ultra 3. While the two watches look very similar, Apple has made important changes to the hardware, health sensors, battery and fitness features.

The Ultra 4 is not a complete redesign. Instead, Apple has focused on making the existing Ultra formula smarter and more capable.

So, if you already own an Ultra 3, is the Ultra 4 worth upgrading to? And if you’re buying your first Ultra, which model should you choose?

Let’s compare them.

Apple Watch Ultra 4 vs Ultra 3: Quick Comparison

1. Design: Don’t Expect a Major Change

The Apple Watch Ultra 4 continues the rugged titanium design that made the Ultra series popular.

It still has the large display, Digital Crown, Action button, titanium construction and outdoor-focused design.

However, Apple has made subtle changes to the dimensions and body. The Ultra 4 is slightly wider and slimmer than the Ultra 3.

For everyday users, though, the difference in appearance is small.

If you already own an Ultra 3, the Ultra 4 will not feel like a completely new watch from a design perspective.

Winner: Ultra 4, but only by a small margin

2. Performance: S11 Chip vs S10

The Ultra 3 uses Apple’s S10 chip, while the Ultra 4 comes with the newer S11 chip.

The S11 isn’t just about making the watch faster. It also enables some of the new health, fitness and intelligent features introduced with the Ultra 4.

For basic tasks such as checking notifications, tracking workouts and using apps, the Ultra 3 is already very capable.

But if you want the latest hardware and longer-term support for new features, the Ultra 4 is the better choice.

Winner: Apple Watch Ultra 4

3. Health Tracking Gets a Major Upgrade

One of the most important changes is Apple’s new Health Sensing System.

The Ultra 4 uses redesigned sensors to improve heart-rate monitoring and collect heart-rate information more frequently.

Apple has also introduced more frequent HRV measurements, which can help provide additional information about stress, recovery and overall wellness.

The Ultra 4 also introduces new health metrics such as:

• Readiness Score
• Health Age
• Improved heart-rate tracking
• More detailed wellness insights
• Enhanced recovery information

This makes the Ultra 4 more interesting for people who use their watch not just for workouts but also for everyday health monitoring.

Winner: Apple Watch Ultra 4

4. Battery Life: One of the Biggest Improvements

Battery life is one of the clearest differences between the two generations.

The Ultra 3 was rated for up to around 42 hours, while the Ultra 4 increases this to up to 50 hours under Apple’s stated conditions.

That’s a meaningful improvement.

It can be especially useful for people who:

• Track sleep every night
• Exercise regularly
• Travel frequently
• Go hiking or camping
• Track long outdoor workouts
• Don’t want to charge their watch every day

The Ultra 4 also offers extended workout tracking for demanding activities.

Winner: Apple Watch Ultra 4

5. Fitness Tracking: Both Are Excellent

The Ultra 3 is already a powerful fitness watch.

It can track activities such as:

• Running
• Walking
• Cycling
• Swimming
• Hiking
• Strength training
• Multisport workouts
• Outdoor activities

The Ultra 4 builds on this foundation with improved health sensing and additional fitness insights.

The new Readiness Score is particularly useful because it helps users understand whether their body may be ready for activity based on recent health and recovery information.

For casual fitness users, however, the difference may not be dramatic.

Winner: Ultra 4

6. Readiness Score and Health Age

The Ultra 4 introduces two notable health features: Readiness Score and Health Age.

Readiness Score is designed to help you understand how prepared you may be for activity on a particular day.

Health Age provides another way to look at your overall health and fitness trends.

These features make the Ultra 4 more useful for people who want their watch to help guide their daily activity rather than simply record it.

Ultra 3 users already have extensive health and fitness tracking, but these new metrics give Ultra 4 an advantage.

Winner: Ultra 4

7. Audio Intelligence and Smarter Features

The S11 chip also enables new Audio Intelligence features.

These features can help with tasks such as recognizing sounds, handling audio information and providing useful summaries or information through the watch.

The Ultra 4 therefore isn’t only a fitness upgrade. It is also becoming a smarter everyday device.

If you mainly use your Apple Watch for workouts, this may not matter much.

But if you use your watch throughout the day, these additions could be useful.

Winner: Ultra 4

8. GPS and Outdoor Performance

Both the Ultra 3 and Ultra 4 are designed for outdoor activities.

Both offer advanced GPS capabilities and features for activities such as hiking, running, cycling and water sports.

The Ultra 4 continues Apple’s focus on outdoor fitness and navigation rather than changing the formula completely.

Therefore, Ultra 3 owners shouldn’t expect a revolutionary difference in GPS performance.

Winner: Tie for most users

Apple Watch Ultra 4 vs Ultra 3: Which Should You Buy?

Choose Apple Watch Ultra 4 if:

• You are buying your first Apple Watch Ultra
• You want the latest Apple Watch technology
• Better health tracking is important
• You want longer battery life
• You like the new Readiness Score
• You want Health Age
• You want the newer S11 chip
• You plan to keep the watch for several years

Choose or keep Apple Watch Ultra 3 if:

• You already own an Ultra 3
• Your current watch performs well
• You mainly track workouts and activity
• You don’t need the latest health features
• Battery life is already sufficient
• You can get Ultra 3 at a significantly lower price

Is It Worth Upgrading from Ultra 3 to Ultra 4?

For an Ultra 3 owner, the answer is not necessarily.

The Ultra 4 is clearly better, but it isn’t a completely different watch.

The biggest reasons to upgrade are:

Improved health sensing + longer battery life + S11 chip + Readiness Score + Health Age + new intelligent features.

If these features are important to you, the upgrade makes sense.

If you are happy with your Ultra 3 and mainly use it for fitness, notifications and outdoor activities, you can comfortably continue using it.

Apple Watch Ultra 4 vs Ultra 3: Final Verdict

The Apple Watch Ultra 4 is the better watch, but the difference is more evolutionary than revolutionary.

For a new buyer, Ultra 4 is the obvious choice because it offers newer hardware, improved health tracking and longer battery life.

For existing Ultra 3 owners, the decision is more complicated.

Simple verdict:

Best overall: Apple Watch Ultra 4
Best battery: Apple Watch Ultra 4
Best health tracking: Apple Watch Ultra 4
Best new features: Apple Watch Ultra 4
Best value if discounted: Apple Watch Ultra 3
Best upgrade for Ultra 3 owners: Only if you want the new health and battery improvements

If you’re buying your first Apple Watch Ultra in 2026, go with the Ultra 4. If you already have an Ultra 3, upgrading is optional rather than essential.

Frequently Asked Questions

What is the main difference between Apple Watch Ultra 4 and Ultra 3?

The biggest differences are the S11 chip, redesigned health sensors, longer battery life, Readiness Score, Health Age and new intelligent features.

Is Ultra 4 faster than Ultra 3?

Yes. Ultra 4 uses the newer S11 chip, while Ultra 3 uses the S10.

Does Ultra 4 have better battery life?

Yes. Ultra 4 is rated for up to 50 hours, compared with around 42 hours for Ultra 3.

Is Apple Watch Ultra 3 still worth buying?

Yes, especially if you find it at a substantially lower price. It remains a powerful smartwatch for fitness, health and outdoor activities.

Should I upgrade from Apple Watch Ultra 3 to Ultra 4?

If you want improved health tracking, longer battery life and the latest features, upgrading can be worthwhile. Otherwise, Ultra 3 is still very capable.

Which is better for fitness, Ultra 4 or Ultra 3?

Ultra 4 has the advantage because of its improved health sensing and new readiness-related features, but Ultra 3 remains an excellent fitness watch.