Comparison · Fitness watches · Desk research
Apple Watch Series 10 vs Apple Watch Ultra 4
Quick Answer
Series 10 (2024) is a 42mm or 46mm Always-On LTPO3 watch with the S10 SiP, 64GB, up to 2000 nits, 374×446 (42mm) / 416×496 (46mm), L1 GPS, 50m + IP6X, ECG, Crash/Fall Detection, and a depth gauge plus water-temperature sensor — not EN 13319 40m recreational dive. Apple Support lists up to 18 hours of normal use, 36 hours in Low Power Mode, 15 minutes ≈ 8 hours, and about 80% in 30 minutes. Ultra 4 (9 September 2026) is.
The verdict
Apple Watch Series 10 or Apple Watch Ultra 4 — quote the two manufacturer sheets.
Why: Series 10 is the 2024 42/46mm S10 watch with LTPO3, a depth gauge plus water temperature (not a 40m dive path), and Apple’s 18-hour / 36-hour Low Power table. Ultra 4 is the 2026 49mm adventure SKU: S11, Health Sensing System, dual-frequency GPS, Action Button, satellite, EN 13319 40m, and 50 / 84 / 45 hours. This URL is not a redirect of the locked Series 10 vs Ultra 3 comparison.
Buy Apple Watch Series 10 if
You want a 42mm or 46mm Apple Watch with S10, Always-On LTPO3, ECG, Crash/Fall Detection, and a depth gauge for shallow water — and you do not need satellite, dual-frequency GPS, or Ultra’s multi-day battery table.
Buy Apple Watch Ultra 4 if
You want Apple’s current 49mm adventure watch: Grade 5 titanium, Action Button, dual-frequency GPS, satellite SOS/Messages/Find My, and Apple’s 50-hour normal-use / 45-hour Max Extended Workout claims.
Spec comparison
OEM rows only. Series 10 numbers are from Apple Support 121202. Ultra 4 numbers are from apple.com/apple-watch-ultra-4/specs/. Cells Apple does not publish stay marked.
This page is notSeries 10 vs Ultra 3. Cross-link both; do not merge them.
| Spec | Series 10 | Ultra 4 |
|---|---|---|
| Year introduced | 2024 (Support) | 2026 (Newsroom 9 September 2026) |
| Case size(s) | 42mm and 46mm | 49mm only |
| Case material | Aluminum or titanium | Grade 5 titanium |
| Dimensions (46mm / 49mm) | 46 × 39 × 9.7mm | 49 × 44 × 12mm |
| Display | LTPO3 OLED Always-On; wide-angle OLED; 42mm 374×446; 46mm 416×496; 326 ppi; up to 2000 nits; 1 nit min | Always-On LTPO3; 422×514; 326 ppi; 3,000 nits peak; 1 nit minimum |
| Front crystal | Ion-X (aluminum); sapphire (titanium) | Flat sapphire |
| Chip / storage | S10 SiP, 64-bit dual-core, 4-core Neural Engine; 64GB | S11; 64GB |
| Battery — normal use | Up to 18 hours | Up to 50 hours |
| Battery — Low Power | Up to 36 hours | Up to 84 hours |
| Battery — outdoor workout | Not listed as Ultra’s outdoor / Extended / Max Extended table | Up to 18 hours outdoor; 25 hours Extended; 45 hours Max Extended Workout |
| Fast charge (OEM) | ~80% in about 30 minutes; 15 min ≈ 8 hours normal use | ~80% in about 45 minutes; 15 min ≈ 18 hours normal use |
| Weight (example SKUs) | Al GPS 46mm 36.4g; Al GPS 42mm 30g; Ti 46mm 41.7g | 63.0g natural titanium; 63.1g black titanium (case only) |
| GNSS | L1 GPS, GLONASS, Galileo, QZSS, and BeiDou | Precision dual-frequency GPS |
| Water | 50m (ISO 22810:2010), swimproof as worded by Apple | 100m (ISO 22810:2010); EN 13319 recreational dive to 40m |
| Depth / water temp | Depth gauge; water temperature sensor (not EN 13319 40m) | Depth gauge; water temperature; EN 13319 to 40m |
| Dust | IP6X | IP6X; MIL-STD-810H subsection list |
| Action Button / siren | Not on Support 121202 | Action Button; siren Apple says is audible to 180m / 600 feet |
| Satellite | Not listed | Emergency SOS, Messages, Find My via satellite |
| Heart rate | Third-generation optical + electrical heart sensor | Health Sensing System |
| ECG / Blood Oxygen | ECG app; Blood Oxygen app (region limits) | ECG app; Blood Oxygen app (region limits) |
| Safety | Emergency SOS, Crash Detection, Fall Detection | Same class plus satellite radios, siren, flashlight |
| OS / phone | Support lists iPhone Xs or later, including iPhone SE (2nd generation or later), with iOS 18 or later | watchOS 27; iPhone 11 or later / SE 2+, iOS 27 |
| watchOS 27 (Apple list) | Series 9 or later | On the list (Ultra 2 or later) |
| US start (dated) | Discontinued as the current Series; no street price treated as fact | $799 (Newsroom, 9 September 2026) |
Who each watch is for
Series 10 is the 2024 everyday Apple Watch in 42mm and 46mm. Wide-angle LTPO3, the thinner 9.7mm case, S10 / 64GB, and a depth gauge plus water temperature are the Support-page story. That depth hardware is not Apple’s EN 13319 40m recreational-dive path.
Ultra 4 is the current adventure Apple Watch. If you need the 49mm case, Action Button, dual-frequency GNSS, satellite radios, 40m dive path, Health Sensing System, or the 50 / 84 / 45-hour table, you are shopping Ultra 4 — not a Series 10 leftover.
Distinct from Series 10 vs Ultra 3
The locked page at /watches/apple-watch-series-10-vs-apple-watch-ultra-3/ compares this same Series with Ultra 3. This slug swaps the B-side to Ultra 4. Keep both URLs. Do not 301.
Battery and charging
Copy Apple’s mode names. Series 10: 18h normal / 36h Low Power; 15 minutes → up to 8 hours; about 80% in 30 minutes (August 2024 tests). Ultra 4: 50 / 84 / 18 / 25 / 45 hours; 15 minutes → up to 18 hours. Max Extended Workout is outdoor run/walk/hike with GPS every second.
GNSS, water, and satellite
Series 10 is L1 GNSS and 50m + IP6X with a depth gauge. Ultra 4 is dual-frequency GNSS, 100m / 40m dive, and satellite. Do not write dual-frequency onto Series 10.
watchOS 27
Series 12 Newsroom, 9 September 2026: watchOS 27 is available for Series 9 or later, SE 3, and Ultra 2 or later, and requires iPhone 11 or later or iPhone SE (2nd generation or later) with iOS 27. Series 10 and Ultra 4 are both on that list. Quote Apple.
Price
$799 is Apple’s published US starting price for Ultra 4 on 9 September 2026. Series 10 leftover or secondary-market tickets are not treated as facts.
Frequently asked questions
Is this the same article as Series 10 vs Ultra 3?
No. /watches/apple-watch-series-10-vs-apple-watch-ultra-3/ is the locked Phase-1 page (Series 10 versus last year’s Ultra). This slug compares the same Series 10 Support sheet with Ultra 4. Neither URL should 301 to the other.
Does Series 10 have dual-frequency GPS?
Apple Support 121202 lists L1 GPS, GLONASS, Galileo, QZSS, and BeiDou. Ultra 4’s spec sheet lists precision dual-frequency GPS. Do not write L1+L5 on Series 10 unless Apple publishes it on that Support page.
Can Series 10 dive to 40m?
No. Series 10 Support lists a depth gauge and water temperature sensor, plus 50m (ISO 22810:2010) swimproof wording that says the watch should not be used for scuba diving or high-velocity water. Ultra 4 lists 100m and EN 13319 recreational scuba to 40m. Depth gauge ≠ 40m dive certification.
Does Series 10 get watchOS 27?
Yes, as Apple named the class. Series 12 Newsroom (9 September 2026): watchOS 27 is available for Apple Watch Series 9 or later, Apple Watch SE 3, and Apple Watch Ultra 2 or later, and requires iPhone 11 or later or iPhone SE (2nd generation or later) with iOS 27. Series 10 is Series 9 or later. Ultra 4 is Ultra 2 or later.
What are the Series 10 battery and charge claims?
Support 121202: up to 18 hours of normal use, up to 36 hours in Low Power Mode, 15 minutes for up to 8 hours of normal use, up to 80% in about 30 minutes (August 2024 Apple tests in the footnotes). Ultra 4: up to 50 hours normal, 84 hours Low Power, 15 minutes ≈ 18 hours.