In comparison Apple Watch Ultra 4 vs Ultra 3, two things matter: battery and sensors. Ultra 4 works for up to 50 hours instead of 42, and the new health measurement system checks heart rate every 5 seconds around the clock and calculates the Readiness index from that. The screen, case dimensions, satellite, and diving remain unchanged.
The watch went on sale September 18, 2026, and in Poland, it costs 3,799 PLN, exactly the same amount that Ultra 3 cost on the day of its premiere a year ago.
There is also one very good piece of news that no presentation mentions: the case did not grow by a millimeter. Ultra 4 has the same dimensions of 49 × 44 × 12 mm as Ultra 3, Ultra 2, and the first Apple Watch Ultra from four years ago.
A short answer to who should choose what: Ultra 4 for the first purchase and for upgrading from older than Ultra 3, Ultra 3 on sale if you count every penny. Owners of Ultra 3 have no reason to change.
Below is the full table of both models, a fair list of things that Ultra 4 does not improve at all, and a specific answer to the question of whether your existing bands and cases will fit the new watch.
On the left Apple Watch Ultra 4, on the right Ultra 3. The case 49 × 44 × 12 mm is identical in both. Photos: Apple.
Apple Watch Ultra 4 vs Ultra 3: full comparison table
We have bolded only those items that actually differ.
| Parametr | Apple Watch Ultra 3 | Apple Watch Ultra 4 |
|---|---|---|
| Premiera | wrzesień 2025 | 18 września 2026 |
| Czip | S10 | S11 |
| Pamięć masowa | 64 GB | 64 GB |
| Czujnik optyczny tętna | 3. generacji | przeprojektowany, Health Sensing System |
| Czujnik elektryczny (EKG) | poprzedniej generacji | większa powierzchnia elektrody |
| Zapis pomiaru tętna | próbki co kilka minut | próbka co 5 sekund, całą dobę |
| Pomiar HRV | standardowa częstotliwość | do 24 razy częściej |
| Gotowość (Readiness) | ❌ | ✅ |
| Audio Intelligence | ❌ | ✅ |
| Wyświetlacz | LTPO3 wide-angle OLED, niegasnący | LTPO3 wide-angle OLED, niegasnący |
| Rozdzielczość | 422 × 514 | 422 × 514 |
| Powierzchnia ekranu | 1 245 mm² | 1 245 mm² |
| Jasność szczytowa | 3 000 nitów | 3 000 nitów |
| Szkło | płaskie szafirowe | płaskie szafirowe |
| Materiał koperty | tytan Grade 5 | tytan Grade 5, drukowany 3D |
| Kolory | tytan naturalny, tytan czarny | tytan naturalny, tytan czarny |
| Wymiary | 49 × 44 × 12 mm | 49 × 44 × 12 mm |
| Masa naturalna / czarna | 61,6 g / 61,8 g | 63,0 g / 63,1 g |
| Bateria, normalne użycie | do 42 godzin | do 50 godzin |
| Tryb Niskie zużycie energii | do 72 godzin | do 84 godzin |
| Trening w plenerze | brak danych w specyfikacji | do 18 godzin |
| Wydłużony trening | brak danych w specyfikacji | do 25 godzin |
| Maksymalny wydłużony trening | brak danych w specyfikacji | do 45 godzin |
| 15 minut ładowania daje | do 12 godzin pracy | do 18 godzin pracy |
| Ładowanie do 80% | ok. 45 minut | ok. 45 minut |
| Sieć komórkowa | 5G RedCap i LTE | 5G RedCap i LTE |
| Łączność satelitarna | ✅ | ✅ |
| Wi-Fi / Bluetooth | Wi-Fi 4 / Bluetooth 5.3 | Wi-Fi 4 / Bluetooth 5.3 |
| GPS | dwuczęstotliwościowy L1 i L5 | dwuczęstotliwościowy L1 i L5 |
| Ultra Wideband | 2. generacji | 2. generacji |
| Wodoszczelność | 100 m, IP6X | 100 m, IP6X |
| Nurkowanie EN13319 | do 40 m | do 40 m |
| Wymagania | iPhone 11+, iOS 26 | iPhone 11+, iOS 27 |
| Cena startowa w Polsce | 3 799 zł | 3 799 zł |
Thirty-four positions, of which fourteen differ. More importantly: apart from 1.4 grams of weight, all differences lie in the battery, sensors, and software. The dimensions of the case and screen remain untouched.
Accessories for both generations are readily available, as the cut has not changed. See straps and cases for the Apple Watch Ultra 49 mm →
Battery: eight more hours and faster charging
This is the most measurable change in the entire launch. The Ultra 3 claimed 42 hours of normal use, while the Ultra 4 states 50 hours. In Low Power mode, the jump is similar: from 72 to 84 hours.
What does this mean in practice? The Ultra 3 usually discharged by the end of the second day, so you realistically charged it every other evening. The Ultra 4 comfortably lasts two full days with sleep tracking in between and leaves a reserve for a morning workout on the third day.
The second gain is even more practical. 15 minutes of charging provides 18 hours of operation instead of 12. A quarter of an hour in the shower is enough to leave the house with the watch for the whole day and night.
- Normal use: 50 hours instead of 42, which is 19% longer
- Low energy consumption: 84 hours instead of 72
- Outdoor training with GPS and heart rate: up to 18 hours in Ultra 4
- Extended training: up to 25 hours in Ultra 4
- Maximum extended training with GPS every second: up to 45 hours in Ultra 4
- Charging to 80%: about 45 minutes in both models
Note the last line. Apple hasn’t changed the full charging speeds, only what it provides in a quarter of an hour. For Ultra 3, the manufacturer does not publish separate results for outdoor training and extended mode, so these two items cannot be fairly compared.
You won’t find chargers in the box of any of these models. If you need a second one for your desk or travel, choose it from the induction chargers category.
New health measurement system, or the second half of this premiere
Apple calls it the Health Sensing System, and it’s not just a marketing label for the same electronics. Both sensors on the bottom of the case have physically changed.
Apple speaks directly about a new optical sensor and a new electrical sensor, meaning both systems responsible for heart rate and ECG. Details of the construction, such as larger LEDs or a different arrangement of photodiodes, are described by industry services; the manufacturer does not provide them in the specifications. The same set of sensors has also been introduced to the Apple Watch Series 12.
Heart rate every 5 seconds instead of samples every few minutes
Apple previously did not specify how often the Ultra 3 measures heart rate in the background. For the Ultra 4, it states directly: readings every 5 seconds around the clock, which is about 17 thousand times a day.
Why so many? Because from denser data, you can calculate things that are not visible in sparse samples: response to stress, micro-fluctuations in heart rate after coffee, recovery pace after intervals.
HRV measured 24 times more often and the Readiness indicator
Heart Rate Variability (HRV) is a parameter that tells you whether the body has actually rested. The Ultra 4 measures it up to 24 times more often than its predecessor and separates it into regenerative HRV and overall HRV.
This is the basis for Readiness, a score on a scale from 0 to 10 that you receive in the morning along with one of four recommendations: recover, pace yourself, you are ready, or go full throttle.
Note: Apple provides the Readiness feature only in Ultra 4 and Series 12 and has not announced it for older models. The feature relies on measurement density that the sensor in Ultra 3 simply does not collect.
If you train according to loads and realistically look at recovery, this is the reason to change your watch. If Ultra is primarily a durable watch with satellite for you, you won’t notice the difference.
Audio Intelligence, or what the watch does with sound
This is a set of four features that Ultra 3 will not receive: Sound Recognition (alarm, baby crying, siren), faster Shazam, Live Rewind (displaying the last 15 seconds of a conversation as text after double-pressing the crown), and Siri Recap (summary of the conversation).
The first two have been available since launch. Live Rewind and Siri Recap require an iPhone with Apple Intelligence and are being rolled out in phases. Apple requires Series 12 or Ultra 4 for them, so it is not exclusive to the Ultra model, but older watches will not receive them.
Czego Apple Watch Ultra 4 nie poprawia
Uczciwa lista rzeczy, które zostały dokładnie takie same. W przypadku modelu Ultra jest ona wyjątkowo długa, bo poprzednik podniósł poprzeczkę bardzo wysoko.
- Ekran: 422 × 514 pikseli, 1 245 mm² powierzchni i 3 000 nitów jasności, bez zmian
- Szkło szafirowe w wersji płaskiej, identyczne w obu modelach
- Koperta: te same 49 × 44 × 12 mm i ten sam tytan Grade 5
- Łączność satelitarna: Alarmowe SOS, wiadomości i Znajdź mają oba modele
- 5G RedCap i LTE, bez różnic
- GPS dwuczęstotliwościowy L1 i L5, ten sam układ
- Nurkowanie: 100 m wodoszczelności i EN13319 do 40 m w obu
- Trzy mikrofony z beamformingiem, dwa głośniki i syrena, identycznie
- Pamięć 64 GB i Ultra Wideband 2. generacji, bez zmian
Nie ma też pomiaru poziomu glukozy, o którym co roku krążą plotki. Nie ma zmiany kształtu koperty ani nowego systemu mocowania pasków.
Za to Ultra 4 jest o 1,4 grama cięższy (63,0 g wobec 61,6 g w tytanie naturalnym). To różnica, której na nadgarstku nie wyczujesz, ale warto wiedzieć, że nowsza generacja nieznacznie utyła, mimo identycznych wymiarów.
Unofficially, 4 GB of RAM has also been added, as reported by 9to5Mac. Apple does not provide this parameter in the specifications, so treat it as second-hand information.
Price of Apple Watch Ultra 4: how much does it cost in Poland
The entry price has not budged. Apple Watch Ultra 4 costs 3,799 PLN in the version with natural or black titanium, always with GPS and cellular modem. Exactly the same price as Ultra 3 on the day of its release.
Ultra 3 has given way to its successor in the spotlight, but it is still available from operators and in retail chains, usually a few hundred zlotys cheaper. This is its only, but very strong argument. A year ago, Ultra 2 was in a similar situation, which we compared with its successor in the comparison of Ultra 3 and Ultra 2.
The Hermès version with a titanium bracelet is a separate price tier and purely an image choice. Underneath sits the same watch.
Apple Watch Ultra 4 z fabryczną opaską Alpine i paskiem Ocean. Zdjęcia: Apple.
Akcesoria do Apple Watch Ultra 4: wszystko ze starszej Ultry pasuje
Tu jest najlepsza wiadomość całego porównania Apple Watch Ultra 4 vs Ultra 3, a zarazem rzecz, o której nie napisze Ci żaden serwis relacjonujący premierę.
Koperta ma identyczne 49 × 44 × 12 mm we wszystkich czterech generacjach modelu Ultra. Oznacza to, że paski, etui, szkła i folie kupione do Ultra 1, Ultra 2 czy Ultra 3 wejdą na Ultra 4 bez żadnych przeróbek.
To sytuacja odwrotna niż w linii Series. Tam koperta Series 12 zmieniła wymiary względem Series 11 (w wersji 46 mm urosła o milimetr wszerz) i etui z poprzedniej generacji przestało pasować. W Ultrze nic takiego się nie wydarzyło.
| Element | Compatibility with Apple Watch Ultra 4 |
|---|---|
| 49 mm bands from Ultra 1 / 2 / 3 | ✅ fit without changes |
| 44 / 45 / 46 mm bands from Apple Watch Series | ✅ fit, same lug size |
| Cases for Ultra 1 / 2 / 3 | ✅ fit without changes |
| Glass and films for Ultra 49 mm | ✅ fit, same cut |
| Bands from smaller Series cases (38–42 mm) | ❌ different lug size |
| Cases, glass, and films from any Series | ❌ different shape and size of the case |
Bands from larger Apple Watch Series cases can be found in the 42–49 mm category — the same models support Ultra.
Beware of two traps. First, only the band attachment fits — cases and glass from the Series line have a different shape and will not fit the Ultra. Second, product cards will still say “Ultra 1 / 2 / 3″ for a few more months, as they were created before the launch of the fourth generation. This describes the state at the time of the product’s market introduction, not a limitation.
Bands for Apple Watch Ultra 4
Bands for Apple Watch Ultra 3 and those for Ultra 4 are exactly the same product today, as the 49 mm lug has not changed since the first generation. Below are three proposals from different price ranges.
UAG Civilian
Pasek UAG Civilian is the closest equivalent to the factory Trail band, only significantly sturdier. The soft silicone with an embossed pattern holds securely on a wet wrist, and the metal buckle does not unclip when snagged on a backpack.
The manufacturer lists models from Series 4 to Ultra 2 in the name, as the band has been available for several years. The 49 mm attachment has not changed, so it also fits the Ultra 3 and Ultra 4.
UNIQ Revix IV Premium
UNIQ Revix IV Premium solves a problem that most manufacturers do not think about: one strap, two colors. It is double-sided, so you can flip it depending on whether you are going for a run or to a meeting.
The magnetic clasp is adjustable without steps, without searching for the right hole. The size includes 44, 45, 46, and 49 mm, which means both the Ultra and larger Series.
NOMAD Rocky Point Band
NOMAD Rocky Point Band is a proposal for someone who bought the Ultra 4 for titanium and doesn’t want to ruin it with discount silicone. FKM rubber is resistant to sweat, salt, and UV radiation, and the fittings are made of titanium in the same shade as the case.
FKM is the same material used for seals in diving equipment. It doesn’t stiffen in the cold and doesn’t yellow after the season.
If you’re looking for something more formal, the same manufacturer offers a titanium bracelet NOMAD Stratos Band, which combines titanium links with FKM inserts.
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We have gathered more proposals in the overview of accessories for Apple Watch Ultra, and a separate compilation for running can be found in the text about sport bands for Apple Watch.
Cases and glasses for Apple Watch Ultra 4
Sapphire glass is scratch-resistant, but not impact-resistant. It breaks from point contact with concrete or a door frame just like regular glass. The cost of screen replacement in the Apple Watch Ultra exceeds a thousand zlotys, so the bill for protection becomes straightforward.
Spigen Rugged Armor and tempered glass
Spigen Rugged Armor case and Tempered Glass combines two things in one box: a flexible TPU case for the watch and glass for the screen. You don’t have to choose two products and check if they fit together.
The matte finish does not collect fingerprints, and the cutouts leave free access to the crown, side button, and orange action button. If you prefer a slimmer profile, the same manufacturer has Spigen Liquid Air Pro.
UAG Scout
Etui UAG Scout is a choice for physical work and cycling. The protruding edge around the display takes the abrasion instead of the glass, and the reinforced corners protect the area where the titanium most often hits the wall.
The manufacturer states compatibility as “Ultra 1 / 2 / 3” because the product has been available since the premiere of Ultra 3. The cut also fits Ultra 4.
Tech-Protect Glass Ring
Tech-Protect Glass Ring is an option for those who do not want to hide titanium under plastic. The metal frame in titanium color only surrounds the edge of the screen, while the rest of the case remains visible.
The set includes two pieces, so the first unsuccessful application does not end the matter. If you prefer a completely invisible solution, check out the Bizon Watch Film HydroFlex hydrogel film in a set of six pieces or GrizzGlass hybrid glass.
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Apple Watch Ultra 4 or Ultra 3: which one to choose?
The whole comparison comes down to five situations and five clear answers.
You have an Apple Watch Ultra 3 and are considering an upgrade. Stick with your current one. The same screen, the same connectivity, the same satellite, and the same diving capabilities. Eight more hours of battery life is not worth the full price of a new watch unless recovery training is your main reason for wearing it.
You have an Apple Watch Ultra 1 or Ultra 2. The jump is significant, but note: the biggest changes came with Ultra 3, not the 4. Satellite, 5G, and a larger screen are thanks to the previous generation. If you find Ultra 3 clearly cheaper, it will be a better purchase than paying extra for the latest model.
You are buying your first Apple Watch Ultra. Choose Ultra 4. Since the entry price hasn’t changed, there’s no reason to reach for the predecessor at a price close to the new one.
You are looking to save money. Ultra 3 on sale from the operator. You get the same screen, the same case, satellite, 5G, and diving up to 40 meters. You only lose the new sensors, Readiness, and eight hours of battery life.
You are hesitating between the Ultra model and the regular Series. Ultra is primarily about battery, satellite, and diving. If none of these three things are necessary for you, check out the cheaper Apple Watch SE 3. And if you are looking beyond the Apple ecosystem, compare it with Google Pixel Watch 5.
Summary
Apple Watch Ultra 4 vs Ultra 3 is a comparison of two very similar watches, where the entire difference lies in two places: the battery and the sensors.
Five conclusions at the end:
- The battery is the strongest argument: 50 hours instead of 42 and a quarter of charging giving 18 hours of operation instead of 12
- The new sensor system measures heart rate every 5 seconds and unlocks the Readiness indicator, which Ultra 3 will not receive
- The screen, case, satellite, and diving are identical, including 3,000 nits and EN13319 to 40 meters
- The case has not grown, so bands, cases, and glasses from any previous Ultra fit without modifications
- The entry price has not changed, so when purchasing for the first time, the newer model wins without discussion
If you stick with Ultra 3, invest in a good strap and glass instead of a new watch. If you switch to the fourth, don’t buy accessories anew; the ones you have will fit without any problem.
FAQ: frequently asked questions
Do the straps from Apple Watch Ultra 3 fit Ultra 4?
Yes. The case has identical dimensions of 49 × 44 × 12 mm in both generations, and the strap attachment has not changed. A strap from Ultra 1, Ultra 2, or Ultra 3 will fit on Ultra 4 without modifications.
Does the case from Apple Watch Ultra 3 fit Ultra 4?
Yes. This is the main difference compared to the Series line, where the Series 12 case grew by a millimeter and the case no longer fit. In the Ultra line, the cut has been the same since the first generation, so the cases and glasses are fully interchangeable.
How much does Apple Watch Ultra 4 cost in Poland?
Apple Watch Ultra 4 costs 3,799 PLN in the natural or black titanium version, always with GPS and cellular modem. This is exactly the same price that Ultra 3 started at a year earlier.
How long does the battery last in Apple Watch Ultra 4?
Up to 50 hours of normal usage and up to 84 hours in Low Power mode. During outdoor training with GPS and heart rate measurement, the watch lasts up to 18 hours, and in maximum extended training mode up to 45 hours.
What’s new in Apple Watch Ultra 4?
There are three new things: battery (50 hours instead of 42), redesigned sensor system with heart rate measurement every 5 seconds and a Readiness indicator, and the Audio Intelligence package. The screen, case, satellite connectivity, and diving remain unchanged compared to Ultra 3.
Is it worth buying Apple Watch Ultra 3 instead of Ultra 4?
It’s worth it if you find it significantly cheaper. The Ultra 3 has the same screen, the same case, satellite connectivity, 5G, and is waterproof up to 40 meters. You lose the new sensors, the Ready indicator, and eight hours of battery life.
Is the Apple Watch Ultra 4 suitable for diving?
Yes, just like its predecessor. Both models have a water resistance of up to 100 meters according to ISO 22810:2010 and EN13319 certification for recreational diving up to 40 meters, with a depth measurement accuracy of ±1 m.
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