Apple Watch Ultra 3 vs Samsung Galaxy Watch Ultra

Apple Watch Ultra 3

The Ultra 3 has the largest display Apple has ever put on a watch — a 422 x 512 wide-angle LTPO3 OLED at 3,000 nits, now with a 1Hz always-on refresh that lets the seconds tick. The flat sapphire-crystal front is tough but slightly reflective.

• The largest Apple Watch display ever — a 422 x 512 wide-angle OLED with slimmer bezels than the Ultra 2.
• 3,000-nit peak brightness — Tech It Easy notes that's a 1,000-nit jump over the Ultra 2, easily readable in any conditions.
• A new 1Hz always-on refresh lets the second hand tick while showing more data — and is more power-efficient.
• The flat sapphire-crystal front is durable but slightly reflective in some outdoor lighting.

Samsung Galaxy Watch Ultra

Super AMOLED with Sapphire Crystal, 3,000 nits peak brightness — the brightest Galaxy Watch display. Always-on, with a red Night Mode for low-light readability.

• 3,000 nits peak brightness — the brightest Galaxy Watch display; excellent outdoor visibility.
• Sapphire Crystal display protection — premium scratch resistance suited to adventure use.
• Red Night Mode — turns watch faces red and black for night-vision-friendly readability.
• Always-on display supported — the large 590mAh battery absorbs the cost comfortably.
• Super AMOLED panel — vibrant and sharp; among the best smartwatch displays.

Apple Watch Ultra 3

The Ultra 3 carries Apple's full health suite — ECG, blood oxygen, skin temperature, Sleep Score, sleep apnea — plus the new hypertension notifications. Independent testing rates its heart-rate and sleep tracking among the best of any wearable.

• Heart-rate tracking is excellent — The Quantified Scientist rates it 'some of the best out there' and one of his most recommended watches for HR accuracy.
• Sleep tracking is class-leading — The Quantified Scientist measured REM-sleep agreement of about 83-84%, 'by far the best out of any device I've seen.'
• New hypertension notifications join ECG, blood oxygen, skin temperature and sleep apnea detection.
• A Sleep Score condenses the night into a single number, with full stage detail underneath.
• For high-intensity weightlifting, even the Ultra 3's strong sensor sees occasional dropouts — a chest strap is still better.

Samsung Galaxy Watch Ultra

BioActive sensor — optical HR, ECG, BIA body composition, skin temperature, AGEs Index. DC Rainmaker found GPS very accurate; flagged Samsung HRV as out of alignment with other wearables.

• BioActive sensor — optical HR, ECG, BIA body composition, skin temperature, and the AGEs Index biological-age metric.
• DC Rainmaker's review title: 'Samsung Galaxy Watch Ultra: finally accurate' — HR and GPS accuracy markedly improved over earlier Galaxy Watches.
• DC Rainmaker flagged Samsung's HRV metrics as 'far out of alignment' with other wearables on most nights — a remaining sensor caveat.
• ECG + AGEs Index — clinical heart-rhythm checks plus biological-age estimation (both need a Samsung phone).
• Sleep tracking with sleep coaching — Samsung's detailed sleep-stage analysis and multi-week coaching program.

Apple Watch Ultra 3

The full watchOS workout app plus the new Workout Buddy AI coaching, dual-frequency GPS billed as the most accurate in a sports watch, and a customizable Action Button. It's a superb everyday fitness and running watch — though serious athletes still note Garmin's deeper analytics.

• Dual-frequency GPS — Apple bills it as the most accurate GPS in a sports watch, and reviewers found tracking reliable on runs and hikes.
• New Workout Buddy AI coaching delivers pacing and motivational feedback during workouts.
• GPS workout battery burn is light for the class — ZONEofTECH lost just 22% over a 5-hour outdoor walk without Low Power Mode.
• It's the best Apple Watch for running — but serious athletes still note Garmin's deeper training analytics and far longer endurance.
• The customizable Action Button gives quick one-press control over workouts and key functions.

Samsung Galaxy Watch Ultra

100+ workout modes, dual-frequency GPS, multisport mode, Energy Score, Race feature. Strong for an Android smartwatch; serious athletes still lean Garmin for training depth.

• Dual-frequency GPS — DC Rainmaker confirms 'very good GPS accuracy,' a real strength of the Watch Ultra.
• 100+ workout modes + multisport mode — broad activity coverage through Samsung Health.
• Energy Score + Galaxy AI Wellness Tips — Samsung Health's AI-powered daily readiness and guidance.
• Training analytics aren't as deep as Garmin's — DC Rainmaker still rates Garmin higher for serious endurance athletes.
• 10 ATM water resistance — pool, open-water, and high-pressure water activities supported.

Apple Watch Ultra 3

The Ultra 3 has the longest battery of any Apple Watch — 42 hours rated (up from the Ultra 2's 36), 72 hours in Low Power Mode. Real-world results routinely beat the claim, hitting 50-72 hours. Charging is rated 0-80% in 45 minutes, though some testers couldn't quite reach that.

• Rated 42 hours of normal use — up from the Ultra 2's 36 — and up to 72 hours in Low Power Mode.
• Real-world endurance beats the claim — ZONEofTECH averaged 50 hours over a month, with days hitting 56 hours including a workout.
• A head-to-head test had the Ultra 3 reach 55 hours before dying — about 7 hours longer than the Ultra 2 in the same test.
• Heavier use lands closer to the rating — Tech It Easy hit about 35 hours with studio work, sleep tracking and normal use.
• Charging is rated 0-80% in 45 minutes with 12 hours from a 15-minute top-up — though ZONEofTECH couldn't hit the 45-minute claim across multiple chargers.

Samsung Galaxy Watch Ultra

590mAh battery — the largest in any Galaxy Watch. Up to ~60 hours typical use, ~100 hours in power-saving mode. Wireless fast charging. DC Rainmaker says it beats Apple's real-world battery.

• 590mAh battery — the largest in any Galaxy Watch; powers the Ultra's multi-day endurance.
• Up to ~100 hours in power-saving mode — DC Rainmaker calls the Ultra the best Wear OS watch 'if you need longer battery life.'
• DC Rainmaker: the Watch Ultra 'beats Apple's battery life in real-world usage, both in daily smartwatch mode and workout modes.'
• Wireless fast charging — a quick top-up before bed enables overnight sleep tracking.
• Still trails Garmin's multi-week endurance — but the Watch Ultra is the longest-lasting Wear OS option.

Apple Watch Ultra 3

watchOS 26 on Apple's S10 chip, with the full App Store, Apple Pay and the deepest smartwatch ecosystem there is. Reviewers consistently rate it the best smartwatch software available — the one hard limit is that it's iPhone-only.

• watchOS 26 with the full App Store and Apple Pay — reviewers consistently rate it the deepest, most polished smartwatch ecosystem.
• Powered by Apple's S10 chip — fast and fluid, a step up from the Ultra 2's S9.
• The Modular Ultra watch face and night mode are owner favorites — and a reason some prefer the Ultra over a Series 11.
• It's iPhone-only — like every Apple Watch, the Ultra 3 does not work with Android.

Samsung Galaxy Watch Ultra

Wear OS 5 + One UI 6 Watch + Galaxy AI. Full Wear OS app access, Samsung Health, Samsung Pay + Google Wallet. Best inside the Samsung phone ecosystem. Android-only.

• Wear OS 5 + One UI 6 Watch — DC Rainmaker highlights 'full access to the Wear OS platform' as a Watch Ultra strength.
• 3nm Exynos W1000 chip — fast, fluid performance; the same chip as the Galaxy Watch 7.
• Galaxy AI features — Energy Score, AI Wellness Tips, plus the full Google Play Store.
• Best inside the Samsung ecosystem — AGEs Index and ECG need a Samsung phone.
• Android-only — no iOS compatibility; best on a Samsung Galaxy phone.

Apple Watch Ultra 3

A 49mm grade-5 titanium case with a flat sapphire-crystal front and edge protection, MIL-STD-810H certified and rated to 100m water resistance. Long-term reviewers call durability one of the Ultra 3's strongest features — with the caveat that the black finish scuffs.

• Durability is one of the Ultra 3's strongest features — Tech It Easy was 'genuinely surprised' how well it holds up.
• Grade-5 titanium case with a flat sapphire-crystal front and raised edge protection — MIL-STD-810H certified.
• 100m water resistance — rugged enough for swimming, watersports and recreational diving.
• The black titanium coating scuffs more easily than the natural finish — the natural model hides wear better.

Samsung Galaxy Watch Ultra

Titanium case + Sapphire Crystal + 10 ATM water resistance + IP68 + MIL-STD-810H. Built for genuine adventure and underwater use.

• Titanium case — Samsung's most durable smartwatch material; built for adventure.
• 10 ATM water resistance + IP68 + MIL-STD-810H — the full rugged-adventure rating set.
• Sapphire Crystal display protection — highly scratch-resistant.
• Built for genuine adventure — the Watch Ultra is Samsung's answer to the rugged Apple Watch Ultra.

Apple Watch Ultra 3

The Ultra 3's headline upgrade: satellite communication — Emergency SOS, Messages and Find My via satellite, off-grid and subscription-free. It adds 5G cellular, dual-frequency GPS and precision iPhone finding.

• Satellite communication is the marquee feature — Emergency SOS, Messages and Find My via satellite work off-grid, with no subscription.
• DC Rainmaker found Apple's satellite messaging faster than Garmin or Google, and its non-geostationary approach can wait for a satellite to come into view.
• 5G cellular is built in — the Ultra is always a cellular model, so it works fully standalone without an iPhone nearby.
• Dual-frequency GPS plus precision iPhone finding and the full Apple Pay / NFC set round out connectivity.

Samsung Galaxy Watch Ultra

Dual-frequency GPS, LTE built in, NFC for Samsung Pay + Google Wallet, Bluetooth, Wi-Fi. Emergency siren for safety.

• Dual-frequency GPS — DC Rainmaker confirms 'very good GPS accuracy.'
• LTE built in — standalone calls, texts, and music streaming without the phone.
• Emergency siren — a loud audible alarm for emergency signaling, an Ultra-tier safety feature.
• NFC for Samsung Pay + Google Wallet — both contactless options.
• Bluetooth + Wi-Fi — full Wear OS connectivity stack.

Apple Watch Ultra 3

The Ultra 3 carries a depth gauge and full recreational dive capability — a WR100 rating plus EN13319 dive certification let it work as a dive computer to 40m, alongside its satellite safety features for off-grid adventures.

• A WR100 rating plus EN13319 dive certification lets the Ultra 3 work as a recreational dive computer down to 40m.
• A built-in depth gauge and water-temperature sensor support diving, snorkeling and watersports.
• Satellite Emergency SOS pairs with the outdoor focus — genuine off-grid safety for hikers and adventurers.
• For genuine multi-day expeditions, reviewers still point to Garmin or Coros — the Ultra 3's battery lasts days, not weeks.

Samsung Galaxy Watch Ultra

10 ATM water resistance + EN13319 dive certification — the Galaxy Watch Ultra is dive-rated and supports free-diving, plus altimeter, barometer, and compass for outdoor navigation.

• EN13319 dive certification — the Galaxy Watch Ultra is rated for recreational diving, supporting free-diving down to 100m.
• 10 ATM water resistance — pool, open-water, and high-pressure water activities; the toughest Galaxy Watch water rating.
• Altimeter + barometer + compass — the full outdoor-navigation sensor suite for hiking and mountaineering.
• Adventure-focused — the Watch Ultra positions itself as a genuine outdoor and underwater tool, not just a smartwatch.

Apple Watch Ultra 3

At $799 — unchanged from the Ultra 2 — the Ultra 3 is the most expensive Apple Watch and an undeniable luxury. For most people a Series 11 covers the essentials at half the price; the Ultra earns its premium only if you genuinely want the biggest screen, longest battery, satellite safety and diving.

• $799 — unchanged from the Ultra 2, which reviewers credit Apple for holding steady.
• AppleInsider's review roundup: the Ultra 3 is an 'excellent and much-needed upgrade,' universally praised for battery and screen.
• For most people, TechRadar argues a Series 11 makes more sense — it covers the essentials for a fraction of the cost.
• vs Garmin: as a smartwatch the Ultra 3 wins on ecosystem, apps and ease of use; Garmin still wins on battery and deep training analytics.
• Best for: iPhone owners who want the ultimate Apple Watch — the biggest screen, longest battery, satellite safety and diving — and aren't fazed by the price.

Samsung Galaxy Watch Ultra

$649 launch. Samsung's rugged flagship — competes with the Apple Watch Ultra (different platform) and Garmin. The longest-lasting, most durable Wear OS watch.

• $649 launch price — significantly more than a standard Galaxy Watch, justified by titanium, the bigger battery, and adventure features.
• DC Rainmaker: 'definitely the best Wear OS watch on the market today, if you need longer battery life, very good GPS accuracy, and full access to the Wear OS platform.'
• vs Apple Watch Ultra: different platforms — the Galaxy Watch Ultra is the Android adventure flagship, with the unavoidable visual resemblance.
• vs Garmin: Samsung wins on Wear OS apps + smart features; Garmin wins on training depth and even longer battery.
• Best for: Samsung phone owners who want the most durable, longest-lasting Wear OS watch with genuine adventure and dive features — and can look past the Apple resemblance.