Apple Watch Series 12 vs. Apple Watch Ultra 4: How Apple’s Newest Watches Compare

Apple’s newest smartwatches, the Apple Watch Series 12 and Apple Watch Ultra 4, share the same watchOS 27 software and many of the same core capabilities. The main difference is straightforward: the Series 12 is the standard model, while the Ultra 4 is a larger titanium watch designed for users who want greater water resistance, more durability, and additional controls.

Both were announced at Apple’s Sept. 9, 2026, Surprise & Shine event. Preorders opened after the announcement, with shipping scheduled for Sept. 18. Pricing remains unchanged from the previous generation: the Series 12 starts at $400, while the Ultra 4 starts at $800.

Apple Watch Series 12 vs. Ultra 4 at a glance

Feature	Apple Watch Series 12	Apple Watch Ultra 4
Starting price	$400	$800
Case sizes	42mm and 46mm	49mm
Case materials	Aluminum, titanium, and ceramic	Titanium
Display	Rectangular OLED display, up to 2,000 nits	Larger rectangular OLED Retina display
Water resistance	Up to 50 meters	Up to 100 meters
Diving	Swimproof	Rated for recreational scuba diving to 40 meters
Dust resistance	IP6X	IP6X
Action button	Not specified in the provided details	Customizable Action button
Software	watchOS 27	watchOS 27
Release timing	Ships Sept. 18, 2026	Ships Sept. 18, 2026

The short answer: which model should you buy?

The Apple Watch Series 12 is the better fit for most buyers who want an everyday Apple Watch, particularly if they prefer a lighter case, more size and color choices, or a lower starting price. Its 42mm and 46mm options also make it easier to choose a watch that suits a smaller wrist or a less bulky appearance.

The Apple Watch Ultra 4 makes more sense for users who specifically benefit from its larger 49mm case, titanium construction, higher water-resistance rating, recreational-diving support, or customizable Action button. It is not simply a larger version of the Series 12: its design prioritizes durability and outdoor use over compactness.

The available details do not compare battery life, charging speed, cellular pricing, or the complete health-sensor feature set. Those factors should be checked before purchasing if they are central to your decision.

Design and display

Apple Watch Series 12

The Series 12 retains Apple’s familiar rectangular watch design, with rounded edges and an OLED display rated for up to 2,000 nits of brightness. It is available in two case sizes:

• 42mm
• 46mm

Apple offers the Series 12 in aluminum, titanium, and a ceramic case material returning from the Apple Watch 5 in 2019.

The materials affect both weight and price. The 42mm aluminum version weighs 32.2 grams, while the titanium model weighs 36.5 grams. The ceramic options weigh more: 41.7 grams for pearl white and 42.8 grams for night blue.

Color choices vary by material:

• Aluminum: dark bronze, light gold, black, and space gray
• Titanium: radiant gold and natural
• Ceramic: pearl white and night blue

The ceramic version adds weight and costs substantially more than the entry-level aluminum model.

Apple Watch Ultra 4

The Ultra 4 keeps the large, rectangular design associated with Apple’s rugged smartwatch line. It is available only in a 49mm case and uses titanium rather than aluminum or ceramic.

The larger body provides room for a customizable Action button, which gives users a dedicated physical control. The Ultra 4 comes in two case colors:

• Natural titanium
• Black titanium

The 49mm case will not suit every wrist. Buyers who prefer a discreet or lightweight watch should consider the Series 12 first.

Build quality and water resistance

Both watches are rated IP6X for dust resistance.

Their water-resistance capabilities differ considerably:

• The Series 12 is water resistant to 50 meters and is described as swimproof.
• The Ultra 4 is water resistant to 100 meters and is rated for recreational scuba diving to 40 meters.

For ordinary swimming and everyday exposure to water, the Series 12 may be sufficient. The Ultra 4 is the more suitable choice for users who regularly dive, spend time in demanding outdoor environments, or want a greater margin of water resistance.

The Ultra 4 has also been tested to MIL-STD 81H, according to the provided product information. The available material does not specify the full range of test conditions or the precise claims Apple makes from that testing, so the designation should not be treated as a guarantee against every type of damage.

Sensors and health tracking

Apple redesigned the sensor array on the underside of both watches to increase the surface area used for readings. The stated result is more frequent heart-rate sampling: readings can be taken every five seconds, compared with roughly every five minutes on older models.

That change may provide more frequent heart-rate data during workouts or daily activity. However, a higher sampling frequency does not by itself establish that every health measurement is more accurate, nor does it replace medical equipment or professional advice.

The Series 12 and Ultra 4 share the same software platform, and both can interact with paired iPhones. A growing number of features can also work when the watch is away from the phone, which is useful for activities such as running. The provided information does not identify every feature that works away from an iPhone or explain which capabilities require a connection.

Price and available materials

The starting prices are unchanged:

• Apple Watch Series 12: from $400
• Apple Watch Ultra 4: from $800

The Series 12 has a much wider price range because Apple sells it in several materials. The 42mm aluminum model starts at $400, while the titanium model reaches $699 and the ceramic model reaches $899.

The Ultra 4 is offered only in titanium, but the final price can rise with fancier bands. This creates an overlap between the higher-priced Series 12 models and the entry-level Ultra 4:

Model or configuration	Listed price
Series 12, 42mm aluminum	From $400
Series 12, titanium	From $699
Series 12, ceramic	Up to $899
Ultra 4, titanium	From $800

The comparison is therefore not simply $400 versus $800. A buyer considering a titanium or ceramic Series 12 should also evaluate whether the Ultra 4’s larger case and rugged features justify the remaining price difference.

What has changed from the previous generation?

The physical designs of both watches are described as being nearly identical to their predecessors: the Series 12 follows the Series 11, while the Ultra 4 follows the previous Ultra model.

This year’s changes include software upgrades and a redesigned underside sensor array. Apple has also retained the prices of the previous generation rather than raising them, even as the company increased prices across its current iPhone range.

Because the available information does not list the previous models’ complete specifications, it does not support a full upgrade analysis. Owners of recent Apple Watches should compare their current model’s health features, display, battery performance, and connectivity with the new watches before deciding that an upgrade is worthwhile.

Bottom line

The Apple Watch Series 12 is the stronger all-purpose choice. It costs less, comes in more sizes and materials, and should suit users who want an Apple Watch without the Ultra line’s larger case and specialized construction.

The Apple Watch Ultra 4 earns its higher price through its 49mm titanium design, 100-meter water resistance, recreational-diving rating, Action button, and more rugged positioning. It is best viewed as an option for users who will actually use those features—not merely as a more expensive version of the standard Apple Watch.

Both models were scheduled to ship on Sept. 18, 2026, and both run watchOS 27.