Health and sensors: serious vs advanced health

SE 3: the solid health base for 95% of people

This is where most went wrong before: the SE was too limited. Here, the SE 3 fixes almost everything which was cheap.

You now have:

• A 2nd generation optical heart rate sensor.
• A temperature sensor (useful for monitoring the cycle, sleep, nocturnal variations).
• A altimeter always oncompass, high g accelerometer, gyroscope.
• THE high or low heart rate notifications And arrhythmia.
• A sleep tracking with phases, sleep score and above all sleep apnea detection.

In short, for daily health + sleep monitoringthe SE 3 is already ultra complete: you see if your heart is racing, if your rhythm is irregular, if your sleep is deteriorating, if signs of apnea appear. This is exactly what the majority of people are looking for before going any further.

What she doesn't have, on purpose:

• NoECG (no electrocardiogram on the wrist).
• Noblood oxygen (SpO₂).
• No dedicated hypertension notifications based on measured blood pressure (and no integrated cuff, obviously).

That's important so as not to talk nonsense: the ECG app is reserved for Series and Ultra, not for SE models. If your doctor asks you for regular ECGs, SE 3 = bad choice. Point.

Series 10: the next level for cardio and diving monitoring

There Series 10she ticks all the “advanced health” boxes:

• Electric heart sensor + Wrist ECG (dedicated ECG app).
• Blood oxygen sensor with Oxygen app.
• Temperature sensor for monitoring the cycle and finer nocturnal variations.
• Arrhythmia notificationsof high/low heart rate, sleep score, sleep apnea notifications.
• Depth gauge + water temperature sensor for swimming and snorkeling.

You don't have to use all of this every day, but whenever you want reassure yourself about a symptom (palpitations, unusual shortness of breath), the ECG and SpO₂ become meaningful. It remains a general public tool, not a complete medical device, but as a “warning signal” it is very useful.

On the water side, the two watches are waterproof 50 m and suitable for swimming. The difference is that the Series 10 also gives you the water depth and temperature. So for extended swims, snorkeling, “very shallow” dives, you have more information, more control.

S10 chip: draw on fluidity

Both watches feature the S10 chip with 64-bit dual-core processor and 4-core Neural Engine. Translation : same level of fluidity, same intelligent functions (double-tap gestures, Siri on the watch with access to health data, new watchOS features, etc.).

So you don't choose between SE 3 and Series 10 for speed. The feeling on the wrist is great.