ECG+ is a highly rated Apple Watch ECG reader for AFib, PAC, PVC, Long QT, bigeminy and more.

You feel something off with your heart — a flutter, a skipped beat, a racing pulse for no reason. You record an ECG on your Apple Watch, but it comes back "normal," or "inconclusive." Your cardiologist runs a 12-lead ECG, and it shows nothing — because the episode isn't happening right then. Everything checks out, yet you're still worried.

That's the gap ECG+ fills. On its own, your Apple Watch only classifies your rhythm as sinus rhythm or AFib. ECG+ reads that same recording and reveals what the built-in app leaves out: it marks individual premature beats (PACs and PVCs), measures QT/QTc and HRV, and tracks your PAC/PVC burden over time.

So every time you feel something off with your heart, you can capture it and bring your doctor a clear, specific report — turning a fleeting feeling into evidence and a focused, productive conversation.

Two common reasons. First, the watch only classifies your rhythm as sinus or AFib, so it doesn't flag premature beats (PACs and PVCs) — a very common cause of palpitations. Second, if the episode wasn't happening during the 30-second recording, there's nothing to catch. ECG+ analyses the same recording for the detail the watch skips, so record whenever you feel something and check it in ECG+.

The built-in app classifies the overall rhythm (sinus rhythm, AFib, high or low heart rate, or inconclusive) but doesn't label the individual premature (ectopic) beats — the skipped beats, extra beats, or fluttering palpitations you can feel. ECG+ analyses the same recording and marks each PAC and PVC on the strip, and calculates your premature-beat burden.

No. The built-in app only classifies your rhythm as sinus rhythm or AFib (plus high or low heart rate, or inconclusive). It doesn't label premature beats (PACs and PVCs), bigeminy, trigeminy, Long QT, or T-wave changes. ECG+ reads the same recording and identifies these.

ECG+ holds a 4.5-star rating from over 5,000 App Store ratings and was independently reviewed by cardiologist Dr. Anthony Pearson, who found it accurately identified PVCs in every recording he checked. Users including ICU nurses and paramedics report its readings match clinical interpretations. As with any tool, findings should be confirmed by a doctor.

It depends what you need. For a quick AFib-or-not check, the built-in Apple ECG app is enough. For detailed analysis — marking individual PACs and PVCs, measuring QT/QTc and HRV, tracking premature-beat burden, and producing a doctor-ready report — ECG+ is one of the most established and highly-rated choices: 4.5 stars from over 5,000 ratings, on the App Store since 2021, and independently reviewed by a cardiologist. See the full breakdown of the best ECG app for Apple Watch.