Comparison · Fitness watches · Desk research
Apple Watch Ultra 4 vs Garmin fēnix 8 (47 mm AMOLED)
Quick Answer
Apple Watch Ultra 4 (Newsroom 9 September 2026) is a single 49mm Grade 5 titanium watch: S11, 64GB, Always-On LTPO3 at 3,000 nits, dual-frequency GPS, Action Button, satellite SOS / Messages / Find My, 100m / EN 13319 40m, Health Sensing System, and up to 50 hours normal / 84 hours Low Power / 45 hours Max Extended Workout, starting at $799, iPhone 11 or later with iOS 27. Garmin fēnix 8 47mm AMOLED (US p/1228429, part 010-02904) is last.
The verdict
Apple Watch Ultra 4 or Garmin fēnix 8 (47 mm AMOLED) — quote the two manufacturer sheets.
Why: Current Apple Ultra versus last-gen 47mm Garmin AMOLED — not a hop of locked Ultra 3 vs fēnix 8, and not Ultra 4 vs fēnix 9. Ultra 4 is one 49mm Grade 5 titanium SKU: S11, Health Sensing System, dual-frequency GPS, satellite SOS/Messages/Find My, EN 13319 40m, and Apple’s 50 / 84 / 45-hour table at $799. 47mm fēnix 8 AMOLED (US p/1228429, 010-02904) is the prior Garmin adventure SKU. The fēnix 8 Series Owner’s Manual prints 16 days Gesture / 7 days Always-On, the 47-hour GPS-only row, 10 ATM, and EN 13319 dive language for that size class.
Buy Apple Watch Ultra 4 if
You live on iPhone, want Apple’s satellite Messages / Find My / Emergency SOS stack, and Apple’s 50-hour / 45-hour Max Extended Workout table is enough.
Buy Garmin fēnix 8 (47 mm AMOLED) if
You want a leftover phone-agnostic Garmin 47mm AMOLED with the Owner’s Manual multi-day table, and you do not need Apple Pay / iMessage / Find My depth.
Spec comparison
OEM rows only. Ultra 4 from apple.com/apple-watch-ultra-4/specs/. fēnix 8 47mm AMOLED from US p/1228429 and the fēnix 8 Series Owner’s Manual.
| Spec | Ultra 4 | fēnix 8 47mm AMOLED |
|---|---|---|
| Year / SKU | 2026; 49mm Grade 5 titanium (A3579) | Prior AMOLED adventure SKU; US 1228429 / 010-02904 |
| Case | 49 × 44 × 12mm | Size class 47mm AMOLED (Owner’s Manual tables are by 43 / 47 / 51mm) |
| Display | Always-On LTPO3; 422×514; 326 ppi; 3,000 nits peak | AMOLED. Nit number not on the cited manual pages |
| Chip / storage | S11; 64GB | Not published on the cited manual pages |
| Battery — daily | Up to 50 hours normal; 84 hours Low Power | Up to 16 days Gesture / 7 days Always-On Display |
| Battery — GNSS examples | 18 hours outdoor; 25 hours Extended; 45 hours Max Extended Workout | GPS only 47 / 37 hours; all-satellite 38 / 30; multi-band 35 / 28; music 10 hours |
| Water / dive | 100m (ISO 22810:2010); EN 13319 recreational dive to 40m | 10 ATM; 4 ATM Dive (EN 13319); depth sensor 0–40 m |
| Satellite | Emergency SOS, Messages, Find My via satellite | Emergency response via Garmin Response on Garmin’s line copy — not Apple Messages / Find My |
| Phone | iPhone 11 or later / SE 2+, iOS 27 | Garmin Connect — iPhone or Android |
| US start (dated) | $799 (Newsroom, 9 September 2026) | Date leftover tickets — not invented here |
Who each watch is for
Ultra 4 is the current Apple adventure watch. The comparison is iPhone depth, satellite Messages / Find My, Health Sensing System, and Apple’s hour table versus Garmin’s day table.
47mm fēnix 8 is leftover Garmin AMOLED with a printed multi-day manual. Keep it when that table is the job.
Frequently asked questions
Is this the same page as Ultra 3 vs fēnix 8 or Ultra 4 vs fēnix 9?
No. Locked /watches/apple-watch-ultra-3-vs-garmin-fenix-8/ and /watches/apple-watch-ultra-4-vs-garmin-fenix-9/ stay. This slug is Ultra 4 versus leftover 47mm fēnix 8 AMOLED.
Why not use Garmin’s 29-day number?
The fēnix 8 Owner’s Manual prints 29 days on 51mm AMOLED. This caption is 47mm: 16 days Gesture / 7 days Always-On.
Does Ultra 4 work with Android?
Apple’s spec sheet requires iPhone 11 or later, including iPhone SE (2nd generation or later), with iOS 27 or later. Garmin Connect pairs with iPhone or Android.