Apple Watch Ultra 3 vs Garmin Fenix 8 Pro MicroLED
Apple Watch Ultra 3 and Garmin Fenix 8 Pro MicroLED are watches both released in 2025 by different brands, with overlapping phone compatibility. This comparison separates the catalog's listed specifications from missing information and approximate values. It covers 18 fields, including 13 exact differences; it does not choose a winner.
Specifications side by side
| Field | Apple Watch Ultra 3 | Garmin Fenix 8 Pro MicroLED |
|---|---|---|
| Release year | 2025 | 2025 |
| Case sizes | 49 mm | 51 mm |
| Display | Wide-angle LTPO3 OLED, Always-On | MicroLED · 400,000 LEDs |
| Brightness | 3000 nits | 4500 nits |
| Battery, as listed | Up to 42 hours · 72 hours saver | Up to 10 days |
| Operating system | watchOS 26 (upgradable to 27) | Garmin OS |
| Phone compatibility | iPhone | Android, iPhone |
| Cellular connection | eSIM · 5G | LTE-M data + inReach satellite (Garmin inReach plan, no phone number) |
| Water rating | 10ATM · EN13319 (diving) | 10ATM · diving |
| Glass | Sapphire | Sapphire |
| Case material | Titanium (natural/black) | Titanium |
| GPS | Dual-frequency GNSS | Dual-frequency GNSS |
| Maps | Yes | Yes |
| Payment system | Apple Pay | Garmin Pay |
| Plan requirement | Not required | Required |
| Listed sensors and features | Sleep apnea, ECG, HRV, Readiness score, SpO2, Skin temperature | ECG, HRV, Readiness score, SpO2, Skin temperature |
| Safety features | Crash detection, depth, Fall detection, Satellite SOS, siren, SOS calling | livelocate, Satellite SOS, SOS calling |
| Hardware flashlight | No | Yes |
"Not listed" means the catalog has no usable value for that field. It does not mean the watch lacks the feature. Approximate values stay visible but do not support the difference count or numeric deltas.
Where they differ
- Case sizes: Apple Watch Ultra 3 lists 49 mm; Garmin Fenix 8 Pro MicroLED lists 51 mm. Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
- Display: Apple Watch Ultra 3 lists Wide-angle LTPO3 OLED, Always-On; Garmin Fenix 8 Pro MicroLED lists MicroLED · 400,000 LEDs.
- Brightness: Apple Watch Ultra 3 lists 3000 nits; Garmin Fenix 8 Pro MicroLED lists 4500 nits. The listed values are 1500 nits apart.
- Battery, as listed: Apple Watch Ultra 3 lists Up to 42 hours · 72 hours saver; Garmin Fenix 8 Pro MicroLED lists Up to 10 days. These are the full listed battery descriptions. Different modes or case variants prevent a single numeric battery-life delta.
- Operating system: Apple Watch Ultra 3 lists watchOS 26 (upgradable to 27); Garmin Fenix 8 Pro MicroLED lists Garmin OS. The listed software descriptions are not a guarantee of the software version currently installed on an individual watch.
- Phone compatibility: Apple Watch Ultra 3 lists iPhone; Garmin Fenix 8 Pro MicroLED lists Android, iPhone.
- Cellular connection: Apple Watch Ultra 3 lists eSIM · 5G; Garmin Fenix 8 Pro MicroLED lists LTE-M data + inReach satellite (Garmin inReach plan, no phone number). Variant wording is retained. A cellular specification alone does not confirm activation with your mobile carrier.
- Case material: Apple Watch Ultra 3 lists Titanium (natural/black); Garmin Fenix 8 Pro MicroLED lists Titanium. Keep the variant qualifications when comparing an individual model; this row describes the catalog entry rather than every configuration.
- Payment system: Apple Watch Ultra 3 lists Apple Pay; Garmin Fenix 8 Pro MicroLED lists Garmin Pay.
- Plan requirement: Apple Watch Ultra 3 lists Not required; Garmin Fenix 8 Pro MicroLED lists Required.
- Listed sensors and features: Apple Watch Ultra 3 lists Sleep apnea, ECG, HRV, Readiness score, SpO2, Skin temperature; Garmin Fenix 8 Pro MicroLED lists ECG, HRV, Readiness score, SpO2, Skin temperature. This compares the listed feature names, not measurement accuracy, clinical usefulness or availability in a particular country.
- Safety features: Apple Watch Ultra 3 lists Crash detection, depth, Fall detection, Satellite SOS, siren, SOS calling; Garmin Fenix 8 Pro MicroLED lists livelocate, Satellite SOS, SOS calling.
- Hardware flashlight: Apple Watch Ultra 3 lists No; Garmin Fenix 8 Pro MicroLED lists Yes.
Where they are the same
- Both list release year: 2025.
- Both list glass: Sapphire.
- Both list gps: Dual-frequency GNSS.
- Both list maps: Yes.
Which one fits you
Apple Watch Ultra 3 is listed as a watch compatible with iPhone. Start with that phone requirement before comparing the other rows. The exact differences above are a way to identify which listed specifications matter to your use, not evidence that one model is better in every respect.
Garmin Fenix 8 Pro MicroLED is listed as a watch compatible with Android, iPhone. Start with that phone requirement before comparing the other rows. The exact differences above are a way to identify which listed specifications matter to your use, not evidence that one model is better in every respect.
Related pages
- Apple Watch Ultra 3 specifications
- Apple watches
- Garmin Fenix 8 Pro MicroLED specifications
- Garmin watches
- Apple Watch Series 10 vs Apple Watch Series 11
- Apple Watch Series 11 vs Apple Watch Series 12
- Apple Watch Series 10 vs Apple Watch Series 9
- Apple Watch SE (2nd gen) vs Apple Watch SE 3
- Apple Watch Ultra 2 vs Apple Watch Ultra 3
- Apple Watch Ultra 3 vs Apple Watch Ultra 4
- All pair comparisons