Choose quickly (without being wrong)

Sport + Advanced health → Series 11. First purchase/teen/budget → SE 3. Music/notifications far from the iPhone regularly? Take cellular; Otherwise, stay in GPS, you will gain in simplicity.

Need a wider panorama (you hesitate with other brands, normal)? Take a look at our selection of reliable iPhone watches to locate the integration effort.

Which really evolves in 2025

Series 11: Best day endurance+night, brighter screen, more resistant front glass on aluminum, complete health sensors, hypertension notifications. SE 3: Always-on, fast charge, clearer sleep follow-up, temperature sensor-and a price that remains wise.

Want to dig the pure new features of Series 11 (shamelessly)? Browse our Detailed Series 11 focus to see what matters, on the wrist, not in the file.

Purchasing experience (land)

Size : wrist <16.5 cm → 40/42 mm; Beyond → 44/46 mm for readability. Bracelet : adjusted, not tight (ECG hates floating). Charge : Adopt the “sprint” after the shower. Cellular : ESIM test 1 month; If you rarely streame on mobility, GPS will be enough. That's a false good idea to pay for nothing.

Summary

• Budget/essentials : SE 3 (Always-on, 6 p.m., temperature, apnea, no ECG/SPO₂).
• Advanced health + readability : Series 11 (ECG, SPO₂, hypertension, 24 hours, 2,000 nits).
• France Prix : € 269 (SE 3) VS € 449 (Series 11). Gap justified by the sensors.
• Cellular : 5G option on both, according to operator/local network.

Faq

Does the SE 3 have the ECG?

No. The ECG and the oximeter are reserved for Series 11 (and ultra).

What size to choose for my wrist?

Below ~ 16.5 cm: 40/42 mm. Above: 44/46 mm. The objective: readable without visual overweight.

Should you take the Cellular version?

Useful if you often leave the iPhone at home (running, swimming pool, short journeys). Otherwise, the GPS is more than enough.

Real autonomy over 24 hours with sleep monitoring?

Series 11: full day + night if you make a load “sprint” (~ 15 min). SE 3: Favor the sprint at the end of the day, you hold at night.

Does the 3 are suitable for triathlon?

For leisure yes (reliable GPS, swimming ok). For structured training + advanced sensors, Series 11 is more suitable.