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

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.

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+ analyzes the same recording and marks each PAC and PVC on the strip, and calculates your premature-beat burden.

The built-in Apple ECG app only labels sinus rhythm or AFib: it won't flag patterns like bigeminy, trigeminy and quadrigeminy, couplets and triplets, Long QT/QTc, or T-wave changes. ECG+ reads the same recording and identifies these, marking them on the strip. (For individual skipped or extra beats, see PACs and PVCs above.)

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+ analyzes the same recording for the detail the watch skips, so record whenever you feel something and check it in ECG+.

ECG+ is for anyone who records ECGs on their Apple Watch and wants more than a sinus-or-AFib result, especially if you feel palpitations, skipped or extra beats, or simply want to stay on top of your heart health (say, with a family history). It marks premature beats (PACs and PVCs), measures QT/QTc and HRV, and turns your recording into a doctor-ready report. It's an informational tool, not a diagnosis or a replacement for medical care.

Your Apple Watch only classifies your rhythm as sinus or AFib. ECG+ reads the same recording for what the built-in app leaves out, individual premature beats (PACs and PVCs), QT/QTc, HRV and your premature-beat burden: so you can capture a symptom the moment it happens and bring your doctor a clear report. Because the watch is already on your wrist, that can also spare you the cost and weeks-long wait of a doctor-ordered heart monitor: as cardiologist Dr. Anthony Pearson notes, the right personal monitoring can often make prolonged ambulatory monitoring (Holter, patch, or MCOT) unnecessary.

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.