AirPods Can Now Measure Your Heart Rate — But Should You Trust Them?
Apple has been steadily pushing the boundaries of what its AirPods can do, and one of the most surprising additions to the lineup is heart rate monitoring. Yes, those wireless earbuds you use to listen to podcasts on your morning commute can now track your pulse during a workout. But the real question isn't whether the feature exists — it's whether the data is actually reliable. To find out, we put AirPods up against two trusted benchmarks: the Apple Watch and a Polar chest strap. Here's what we discovered.
How Do AirPods Measure Heart Rate?
AirPods use a technology called photoplethysmography (PPG), the same optical sensing method used in many wrist-based wearables. Tiny LED lights shine into the skin — in this case, the inside of your ear canal — and sensors measure how light is absorbed and reflected by blood flowing through your vessels. Because blood volume in the ear changes with each heartbeat, the device can calculate your beats per minute.
The ear, it turns out, is actually considered an excellent location for optical heart rate sensing. The tissue inside the ear canal is relatively stable compared to the wrist, where movement and loose fit can introduce significant noise into the signal. In theory, this gives AirPods a physiological advantage over wrist-worn devices during physical activity. But theory and real-world performance don't always align.
The Testing Method: Apple Watch and Polar Chest Strap as Benchmarks
To evaluate AirPods heart rate accuracy fairly, we needed reliable reference points. Two devices were chosen for comparison. The Apple Watch is one of the most popular consumer heart rate monitors on the market and uses its own optical PPG sensor on the wrist. The Polar chest strap, on the other hand, uses electrical sensors placed directly on the chest, capturing the heart's electrical signal much like a clinical ECG. Chest straps are widely regarded as the gold standard for heart rate accuracy in consumer fitness technology.
Testing was conducted across several workout scenarios, including a steady-state run, a high-intensity interval training (HIIT) session, and a moderate cycling session. All three devices were worn simultaneously, with readings compared at regular intervals and during transitions between rest and exertion.
Steady-State Cardio: AirPods Hold Their Own
During the steady-state run, where heart rate climbed gradually and stayed relatively consistent for a sustained period, the AirPods performed impressively. Readings were closely aligned with both the Apple Watch and the Polar chest strap, with differences of only two to four beats per minute in most instances. For someone tracking general cardiovascular effort during a long run or moderate bike ride, this level of accuracy is more than sufficient.
One key advantage that emerged during this phase was comfort. Wearing a chest strap for an extended period can feel restrictive, and even a well-fitted Apple Watch can shift slightly during movement. The AirPods, already in your ears for music or podcast playback, added no extra gear burden whatsoever.
HIIT Workouts: Where Things Get Complicated
High-intensity interval training introduced more variability. During rapid transitions — say, sprinting for 30 seconds and then dropping to a walk — the AirPods were occasionally slower to register the spike or drop in heart rate compared to the Polar chest strap. The chest strap consistently captured the peak heart rate within the active interval, while the AirPods sometimes lagged by five to ten seconds before reflecting the correct value.
The Apple Watch showed similar lag behavior, suggesting this is a limitation of optical PPG technology in general rather than a specific flaw in AirPods. For athletes who train in specific heart rate zones and need real-time accuracy during intense efforts, this latency matters. For casual users tracking general effort, it's a minor issue.
Fit Matters More Than You Think
One consistent variable across all testing was how dramatically AirPod fit affected accuracy. When the earbuds created a snug seal in the ear canal, heart rate readings were much closer to the Polar benchmark. When the fit was loose — a common issue for users who find standard AirPod tips don't suit their ear shape — readings became erratic and unreliable.
This means that getting the right ear tip size isn't just about sound quality or noise cancellation. For heart rate tracking to function accurately, a proper seal is essential. Apple includes multiple tip sizes, and taking the time to find the right fit pays dividends well beyond audio performance.
Should You Use AirPods to Track Your Heart Rate?
- For casual workouts and general fitness tracking: AirPods deliver solid, trustworthy heart rate data during moderate-intensity exercise. If you're exercising regularly and want a rough gauge of cardiovascular effort without buying additional gear, AirPods are a genuinely useful tool.
- For structured training with heart rate zones: The slight lag during rapid intensity changes means AirPods may not be precise enough if you're following a strict training plan that depends on hitting specific zones at specific moments. In this case, a dedicated chest strap remains the smarter choice.
- For Apple Watch users: If you already wear an Apple Watch during workouts, adding AirPods heart rate data may be redundant. However, for users who prefer not to wear a watch, AirPods fill that gap admirably.
The Bottom Line
AirPods heart rate monitoring is a genuinely capable feature that works well under the right conditions. It won't replace a dedicated chest strap for precision athletic training, and it performs best during steady, sustained activity rather than explosive intervals. But for the majority of everyday fitness users — people going for runs, doing yoga, cycling, or hitting the gym — it delivers accurate enough data to be genuinely useful, with the added convenience of not requiring any extra equipment. If your AirPods fit well and you're exercising at a consistent pace, you can trust what they're telling you about your heart.
As Apple continues to refine the software algorithms behind this feature, accuracy during high-intensity efforts will likely improve over time. For now, AirPods sit comfortably in the category of "surprisingly good" — not perfect, but far better than many expected from a pair of earbuds.