Apple Watch Ultra 3: Specs, Features, Pros & Cons
Product overview Researched from the manufacturer’s documentation and the sources listed below. We have not tested this unit.
The Apple Watch Ultra 3 was the first Apple Watch that could send messages over satellite. With no cellular signal at all it can call Emergency SOS, share its location in Find My and exchange texts through Globalstar's network, and Apple includes that service free for two years after activation. One footnote changes how far that reaches: texting over satellite works only while the paired iPhone is switched on and connected to Wi-Fi or a mobile network somewhere, even though the phone itself can stay at home.
Around the radio sits the usual Ultra hardware: a 49 mm Grade 5 titanium case, a flat sapphire front, a 100 m water rating with recreational scuba diving through a third-party dive app, and L1 plus L5 dual-frequency GPS, which keeps a recorded track honest between tall buildings and in deep valleys. The display moved to wide-angle OLED with LTPO3, so the always-on face can tick once a second at a 1 Hz refresh, and cellular gained 5G RedCap alongside LTE.
Apple rates the battery at 42 hours, and its test day includes six hours of sleep tracking, so the rating already assumes the watch stays on overnight. Low Power Mode stretches it to 72 hours.
Apple's own store now sells the Ultra 4 in its place, rated at 50 hours on the company's compare page. The Ultra 3 keeps the full health set of the line (ECG, blood oxygen, wrist temperature, sleep apnea and hypertension notifications), and like every Apple Watch it pairs only with an iPhone.
Category strengths
Where the Apple Watch Ultra 3 beats the median
- Much stronger water resistance ?10 ATM vs 5 ATM (median)
- Has LTE / cellular ?
- Slightly higher resolution ?514 px vs 480 px (median)
- A slightly larger watch case ?49 mm vs 45.8 mm (median)
Where the Apple Watch Ultra 3 trails the median
- Much shorter battery life ?42 h vs 84 h (median)
- No Android compatibility ?
- A much heavier build ?61.6 g vs 40.35 g (median)
How this VS Score was computed
Score 61: each known spec is measured against the median of all smartwatches (34 products), then weighted. 54% of the scoreable weight could be used. See how we score
| Specification | This product | Cohort median | Score weight | Points moved |
|---|---|---|---|---|
| Battery life | 42 | 84 | 2.5 | −62.5 |
| Water resistance | 10 | 5 | 1 | +50.0 |
| ECG | Yes | 64% of the class have it | 1 | +50.0 |
| iOS compatible | Yes | 74% of the class have it | 1 | +50.0 |
| Android compatible | No | 74% of the class have it | 1 | −48.0 |
| Sapphire glass | Yes | 67% of the class have it | 0.5 | +25.0 |
| Skin temperature | Yes | 76% of the class have it | 0.5 | +25.0 |
| Wi-Fi | Yes | 62% of the class have it | 0.5 | +25.0 |
| Dual-frequency GPS | Yes | 73% of the class have it | 0.5 | +25.0 |
| LTE / cellular | Yes | 47% of the class have it | 0.5 | +25.0 |
| Weight | 61.6 | 40.35 | 1 | −17.0 |
| Resolution | 514 — capped at the class’s upper range (502) | 480 | 1 | +2.0 |
| Case size | 49 — capped at the class’s upper range (47.5) | 45.8 | 0.5 | +1.0 |
| Peak brightness | 3,000 | 3,000 | 1 | +0.0 |
| Bluetooth version | 5.3 | 5.3 | 0.5 | +0.0 |
| Onboard storage | 64 | 64 | 0.5 | +0.0 |
Not scored: Always-on display (standard for the class (100% have it)); Display size (unknown: not scored); Heart rate monitor (standard for the class (100% have it)); Blood oxygen (SpO2) (standard for the class (97% have it)); Blood pressure (not applicable: only 12% of this class have it); Sleep tracking (standard for the class (100% have it)); Built-in GPS (standard for the class (97% have it)); Fall detection (standard for the class (100% have it)); Sport modes (unknown: not scored); Fast charging (standard for the class (100% have it)); Wireless charging (unknown: not scored); NFC payments (standard for the class (85% have it)); Speaker & microphone (standard for the class (97% have it)); Third-party app store (unknown: not scored); Subscription required (unknown: not scored); Warranty (unknown: not scored).
Editor’s note
The natural titanium case weighs 61.6 g before the band and is 12 mm thick, so the Ultra 3 sits high on the wrist and catches on shirt cuffs in a way the 9.7 mm Series 11 never does. Apple says it fits wrists from 130 to 210 mm, but there is only one case size, and on a slim wrist it covers most of the top.
The bulk pays for tools that earn their keep outdoors: the orange Action button for starting a workout or dropping a waypoint, a siren, a depth gauge and water temperature sensor, Backtrack, and offline maps with custom routes. At night the Modular Ultra and Wayfinder faces switch to red in Night Mode and the panel dims to 1 nit, which keeps it from lighting up a tent. The dive computer Apple points to, Oceanic+, needs a subscription.
Fifteen minutes on the included fast charger buys about 12 hours of normal use by Apple's rating, so a short top-up while getting dressed covers the day after a night of sleep tracking, and the watch rarely has to come off for long.
Satellite is the feature no Series 11 has, and it is the reason I would choose this one over the thinner watch for anyone who walks or sails beyond cell coverage. For an iPhone owner whose outdoors is a park run and a weekend in town, the case is a lot of watch to carry for a battery advantage a midday top-up already covers.
Specifications
Design
Display
Health & fitness
Battery
Connectivity
Software
Phone & subscription
Living with it
Setup and phone integration
iPhone only: the manufacturer lists no Android support.
Pairs over Bluetooth 5.3.
App and daily use
Tracks, according to the spec sheet: heart rate monitor, blood oxygen (SpO2), skin temperature, sleep tracking, eCG, built-in GPS.
The always-on display shows the time without a wrist raise, at a cost in battery life.
Contactless payments are supported; the wallet service and the banks it accepts vary by country.
The cellular version works away from the phone once the carrier plan is added.
Compatibility and availability by country
Data can leave the app through: wi-Fi.
Battery and comfort
Rated battery life is 42 h per charge, with a full charge taking 45 min. Ratings assume the maker’s test conditions; always-on features shorten them.
It weighs 61.6 g.
Water resistance: 10 ATM.
Over time
11 specifications are not published by the manufacturer and are shown as Unknown rather than guessed.
Sources and verification
Where the specifications come from
- Official product pagesupport.apple.com
Verification
- First published
- Specifications last checked
- Sheet completeness
- 31 of 42 specifications verified; the rest show as Unknown and are never estimated or scored
- Page type
- Product specification page — Compiled from the manufacturer’s published specifications and the cited sources; this is not a hands-on test.
- Basis
- Research-based: specifications and editorial text were compiled from the documents listed here and the manufacturer’s published data. We have not tested this unit ourselves; where independent measurements are mentioned they belong to the linked publication.
Smartwatches with similar specs to the Apple Watch Ultra 3
Ratings & reviews
No reviews yet. Be the first to share your experience.
The bottom line
The Apple Watch Ultra 3 earns a VS Score of 61, above the median of the 34 smartwatches it is measured against (a score of 50 is level with that median).
- Who it’s for
- An iPhone owner who hikes, sails or drives through places without cell coverage and wants satellite SOS and messaging on the wrist, plus a battery that lasts through a night of sleep tracking.
- Who should look elsewhere
- Anyone with a slim wrist or an Android phone. It pairs only with an iPhone, and its single large case wears heavy at a desk.
- The trade-off that matters
- The titanium case and the dive and safety hardware make it heavier than any Series model, so it never disappears under a sleeve and takes some getting used to in bed.
- The main alternative
- Apple Watch Series 11: the same ECG, blood oxygen and sleep tracking in a far thinner case, if satellite and the long battery are not the point.
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