I Tested the Apple Watch's New Heart Rate Sensor to See If It's Really Better Than Garmin's

# Apple Watch Series 12 Heart Rate Sensor vs. Garmin Forerunner 570: A Parent's Guide to Wearable Accuracy

Apple's new Series 12 watch landed with upgraded heart rate monitoring technology. For parents tracking their own fitness or considering wearables for active teens, the question matters: does Apple's latest sensor actually outperform established competitors like Garmin's Forerunner 570?

The core issue comes down to accuracy during exercise. Heart rate monitors in consumer wearables use photoplethysmography (PPG), which bounces light off your wrist to detect blood flow. The Apple Watch Series 12 introduces a redesigned sensor array with improved LED positioning and faster sampling rates. Garmin's Forerunner 570, a dedicated sports watch, relies on its own optical sensor system refined over years of athlete feedback.

In real-world testing, accuracy depends heavily on fit, skin tone, and activity type. A loose watch reads differently than a snug one. During high-intensity interval training, optical sensors sometimes struggle. Swimming renders most optical sensors unreliable, though both devices address this through additional motion sensors. The Forerunner 570 includes Garmin's proprietary running dynamics metrics, giving athletes data beyond heart rate alone.

For parents, this matters in two ways. First, if you use a smartwatch to monitor your own health, accuracy matters for training zones and workout intensity. Second, if your teenager wears a watch during sports, you might want reliable data to discuss their conditioning and safety.

The Apple Watch Series 12 advantages include integration with the iPhone ecosystem, automatic workout detection, and seamless notifications. You'll get heart rate trends stored in the Health app. The Garmin Forerunner 570 excels with battery life, typically lasting seven to fourteen days versus Apple's eighteen-hour claim. Garmin also provides detailed training load metrics and recovery recommendations grounded in sports science research.

Price points diverge significantly. The Apple Watch Series 12 starts at approximately $429. The Forerunner 570 runs roughly $299. That $130 difference matters for families buying multiple devices or testing the category.

Neither watch replaces a medical-grade chest strap or hospital monitor. For casual fitness tracking, both perform adequately. For serious athletes or parents monitoring a teen's conditioning program, a dedicated sports watch like Garmin's offers sport-specific features. Apple's watch wins if ecosystem integration and daily smartwatch functions matter more than training metrics.

The testing reveals that "better" depends on your needs. Apple's sensor may read heart rate slightly more consistently during steady cardio, but Garmin's watch survives harder use and charges less frequently. A parent juggling multiple devices appreciates Garmin's battery efficiency. Someone already deep in Apple's ecosystem finds Apple's watch natural.

For families purchasing their first fitness wearable, consider what you'll actually use. Will you check heart rate once daily or analyze training data weekly? Do you need a watch for calls and texts, or just fitness? These questions matter more than sensor specs.

Both devices collect heart rate data accurately enough for fitness goals that don't require medical precision. The real difference emerges in the software layer, battery expectations, and whether you want a sports tool or a connected device that tracks workouts.