Performance
- Apple Watch Ultra 3
- Apple S10; 4-core Neural Engine processor
- Apple Watch Series 12 42mm
- Apple S11 chip; 4-core Neural Engine processor
Watch comparison
Apple Ultra 3 vs Apple Series 12 42mm
Compare battery life, health tracking, display and fit.
01Selected  Apple Watch Ultra 3
KSh 90,000In Stock | 02  Apple Watch Series 12 42mm
KSh 64,000In Stock |
|---|
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Apple Watch UltraKSh 90,000
Apple Watch Ultra 2KSh 103,500
Huawei Watch Ultimate 2KSh 124,000
Amazfit T-Rex Ultra 2KSh 85,000
Apple Watch Ultra 4 49mmKSh 118,000
Apple Watch Series 12 46mmKSh 70,000
Huawei Watch D3KSh 75,000
2 of 4 products
Our quick verdict
The Apple Watch Ultra 3 lasts longer between charges (42 hours vs 24 hours), has a brighter screen for outdoor use and is rated for free diving to 40 m, while the Apple Watch Series 12 42mm gives daily readiness scores, is lighter to wear all day and has faster recharging (30 minutes).
Software
- Apple Watch Ultra 3
- Runs watchOS 26, upgradable to watchOS 27
- Apple Watch Series 12 42mm
- Runs watchOS 27
Battery life
- Apple Watch Ultra 3
- Up to 42 hours per charge
- Apple Watch Series 12 42mm
- Up to 24 hours per charge
Portability
- Apple Watch Ultra 3
- 61.6 g
- Apple Watch Series 12 42mm
- 32.2 g
Water resistance
- Apple Watch Ultra 3
- 100 m under ISO 22810:2010
- Apple Watch Series 12 42mm
- 50 m swimproof under ISO 22810:2010
Key differences
The main differences to help you choose.
Apple Watch Ultra 3
- Longer battery life: up to 42 hours (vs 24 hours).
- Rated for up to 42 hours per charge (vs 24).
- Brighter display: up to 3,000 nits (vs 2,000).
- Rated for free diving to 40 m.
Apple Watch Series 12 42mm
- Lighter: 32.2 g (vs 61.6 g).
- Daily readiness scores.
- Recharges faster: 30 minutes (vs 45 minutes).
- Blood-pressure (hypertension) notifications.
- Slimmer: 9.7 mm thick (vs 12 mm).
- Newer watchOS 27 (vs watchOS 26).
What matters most to you?
6 priorities selected.
| Priority | Apple Watch Ultra 3 | Apple Watch Series 12 42mm |
|---|---|---|
| Battery life | Up to 42 hours per charge | Up to 24 hours per charge |
| Portability | 61.6 g | 32.2 g |
| Storage | 64 GB storage | 64 GB storage |
| Display | OLED display, 326 ppi | OLED display, 326 ppi |
| Performance | Apple S10 processor | Apple S11 chip processor |
| Software | watchOS 26 | watchOS 27 |
| Connections | Wi-Fi 4, Bluetooth 5.3 | Wi-Fi 4, Bluetooth 5.3 |
| Water resistance | 100 m under ISO 22810:2010 | 50 m swimproof under ISO 22810:2010 |
| Sleep tracking | Sleep duration and sleep stages | Sleep duration and stages, sleep score |
| Charging | Magnetic fast charging | Fast-charge capable |
| Speaker | Dual speakers, siren | Speaker with media playback |
| Durability / certifications | IP6X dust resistance, MIL-STD-810H | IP6X dust resistance |
| Ultra wideband (UWB) | Ultra Wideband (UWB) support (gen2 chip) | Second-generation Ultra Wideband chip |
| Wrist size | 130–210 mm | 42mm: 130–200 mm, 46mm: 140–245 mm |
| SIM / eSIM | eSIM | eSIM on GPS + Cellular models |
Tick a topic above to see how each product answers it.
Detailed comparison
Explore the full specifications, section by section.
These products have the same published specifications.
Similarities
- Both belong to the Apple Watch platform.
- Both support Wi-Fi 4.
- Both use Bluetooth 5.3.
- Both work with a companion app.
- Both have NFC.
- Both take ECG readings.
In summary
Get the Apple Watch Ultra 3 if you want longer battery life and a brighter screen for outdoor use, or the Apple Watch Series 12 42mm if you would rather have daily readiness scores and a lighter watch for all-day wear.
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