The best Apple Watch for heart monitoring (2026)

Updated September 9, 2026, including the newly announced Apple Watch Series 12, Ultra 4, fourth-generation heart rate sensor, and Readiness feature

The Apple Watch is a powerful whole health monitor. The newest Apple Watch models contain sensors for most of the major vital signs: pulse (heart rate), an FDA-cleared ECG sensor, oxygen saturation, breathing rate, temperature, sleep apnea detection (2024), and hypertension notifications (2025).

Apple Watch features for monitoring sleep and heart health (source: Empirical Health for Apple Watch)

If you’re looking to buy an Apple Watch for health monitoring, you have four major options as of 2026: a new Series 12, an Apple Watch SE3, an Apple Watch Ultra 4, or a used Series 9, 10, or 11. Series 12 and Ultra 4 were announced September 9; check availability before ordering.

Which Apple Watch supports watchOS 27?

watchOS 27 was announced in June 2026. It runs on the Apple Watch Ultra 2, Series 9, and SE3 or above. Older models, including the Series 6, 7, and 8 and the original SE, SE2, and Ultra, won’t get watchOS 27 or its future health features. If you’re buying a watch today, get one that’s compatible: a Series 9 or later, an Ultra 2 or later, or an SE3. That rules out older used models that might otherwise look like a bargain.

Supporting watchOS 27 does not mean a watch has the new fourth-generation sensor. Here’s what changes with the September 2026 models:

Health Feature	Series 12	Ultra 4	Earlier models
Optical heart rate sensor	Fourth generation	Fourth generation	Earlier generations
Background heart rate	Every 5 seconds	Every 5 seconds	Periodic readings
HRV	Every 5 minutes	Every 5 minutes	Opportunistic readings and Breathe sessions

Apple also announced HRV in Vitals and a Readiness score. Readiness compatibility on older watches still needs confirmation; it should not be inferred from sensor generation alone.

For comparison, here’s how the health sensors vary across earlier Apple Watch models:

Health Feature	Series 6-8	Series 9/10/11	Ultra 2/3	SE3
Heart Rate	✓	✓	✓	✓
ECG	✓	✓	✓	-
Hypertension notifications	-	✓	✓	-
Blood Oxygen	✓	✓	✓	-
Temperature [1]	Series 8 only	✓	✓	-
Sleep Tracking	✓	✓	✓	✓
Sleep Apnea Detection [2]	-	✓	✓	-
Fall Detection	✓	✓	✓	✓
High/Low Heart Rate	✓	✓	✓	✓
Irregular Rhythm	✓	✓	✓	✓
Cardio Fitness (VO2 Max)	✓	✓	✓	✓
watchOS 27 [3]	-	✓	✓	✓
Starting Price at Launch	—	$399	$799	$249

[1] Temperature sensing was introduced with Apple Watch Series 8 [2] Sleep apnea detection requires watchOS 10.3 or later [3] watchOS 27 (announced June 2026) runs on the Apple Watch Ultra 2, Series 9, and SE3 or above

Apple Watch Series 12: comprehensive health monitoring, including ECG, heart rate, sleep apnea, & hypertension

ECG sensor on the Apple Watch Series 4 and above

The newest Apple Watch is the Series 12, announced September 9, 2026. It adds a fourth-generation heart rate sensor with background readings every 5 seconds and HRV every 5 minutes, alongside ECG, sleep apnea monitoring, and hypertension notifications.

Apple Watch Ultra 4: similar health sensors, more rugged

The Apple Watch Ultra 4, announced September 9, 2026, also includes the fourth-generation heart rate sensor and more frequent HR and HRV measurements. This is a premium option targeted at serious hikers or athletes.

Apple Watch SE (3rd edition): affordable, but fewer health sensors

Although the Apple Watch SE is more affordable at $249, it’s lighter on health sensors. It includes a second generation heart rate sensor and sleep tracking, but not an FDA-cleared ECG or blood oxygen sensor. If you’re looking for something in this price range, also consider a used Apple Watch Series 9 or above which have additional health sensors.

Used Apple Watch Series 9, 10, or 11

If you want ECG, blood oxygen, and temperature sensing at an affordable price point, a used Apple Watch Series 9, 10, or 11 is a good option. These models have the third-generation heart rate sensor, so they do not offer the new fourth-generation sampling rates. The Series 9 includes all of the health sensors of the series 10, and both support watchOS 27. (The Series 8 and prior are missing sleep apnea detection, and won’t get watchOS 27.)

Buying these models used is a good option if you want more health sensors at an affordable price. As of this writing, used Apple Watches are selling for below $300. Stick to a Series 9 or later so you stay on the latest watchOS.

The best Apple Watch for heart health

Which Apple Watch is right for you depends, in part, on your specific heart health monitoring needs.

Heart arrhythmias (such as atrial fibrillation)

If you have an arrythmia, such as atrial fibrillation or supraventricular tachycardia, then you’ll likely want an Apple Watch with an ECG (electrocardiogram). The Apple Watch Series 4 or above have an ECG sensor, but not the Apple Watch SE, SE2, or SE3.

All models of Apple Watch released since 2018 support afib history. Afib history estimates the percent of time each week your heart spends in atrial fibrillation. This feature was FDA-cleared in June 2022, and was released with watchOS 9.

Heart attack risk & proactive heart health

While Apple Watch cannot detect a heart attack, it can be part of a comprehensive heart health program using VO2Max, cardio recovery, and more. To be comprehensive, you will need to pair the Apple Watch with the results of an advanced blood test (e.g., an advanced heart health panel).

Best Apple Watch for blood pressure

Any Apple Watch can be paired with a cuff-based blood pressure monitor. As of 2026, the Apple Watch itself alerts for hypertension but does not give a continuous blood pressure measurement. The newly announced 5-second heart rate readings should not be confused with blood pressure measurements.

Best Apple Watch for sleep health

All Apple Watch models track sleep stages (core, deep, and REM sleep). The Series 9–12 and Ultra 2–4 include a sleep apnea detection feature that detects 89% of severe sleep apnea.

The best overall Apple Watch for health monitoring

What’s my overall recommendation? I’d choose a Series 12 or Ultra 4 if more frequent heart rate and HRV tracking is a priority. If you’re on a budget, a used Series 9, 10, or 11 offers most of the other health sensors for less. Whatever you choose, get a model that supports watchOS 27 (Series 9 or later, Ultra 2 or later, or SE3), while keeping in mind that software updates do not add the fourth-generation sensor.