HeartLab vs Apple Watch Built-in ECG
Both use the same Apple Watch hardware, but HeartLab goes far deeper. Compare AFib-only detection against comprehensive arrhythmia analysis with PVC, PAC, bigeminy detection and 12+ HRV metrics.
Feature Comparison
Apple Watch includes a built-in ECG app that can detect atrial fibrillation (AFib). While this is a valuable screening tool, it only classifies recordings into three categories: sinus rhythm, AFib, or inconclusive. HeartLab reads the exact same Apple Watch ECG data but performs a much deeper analysis, detecting PVCs, PACs, bigeminy, trigeminy, and providing 12+ HRV metrics, Poincaré plots, cardiac scoring, and AI-powered insights.
| Feature | HeartLab | Apple Watch ECG |
|---|---|---|
| AFib Detection | ✓ | ✓ |
| PVC Detection | ✓ | ✗ |
| PAC Detection | ✓ | ✗ |
| Bigeminy/Trigeminy | ✓ | ✗ |
| HRV Metrics | 12+ | Basic |
| Poincaré Plot | ✓ | ✗ |
| AI Assistant | ✓ | ✗ |
| PDF Reports | ✓ | ✗ |
| On-Device Processing | ✓ | ✓ |
| Cardiac Score | ✓ | ✗ |
| ECG Trends | ✓ | Limited |
| Languages | 16 | 40+ |
| Extra Hardware | None | None |
| Base Price | Free | Free |
Why Choose HeartLab
HeartLab analyzes the same Apple Watch ECG data at a much deeper level. While Apple's built-in ECG only tells you if you have AFib or sinus rhythm, HeartLab detects PVCs (premature ventricular contractions), PACs (premature atrial contractions), bigeminy, and trigeminy patterns. It provides 12+ HRV metrics including SDNN, RMSSD, pNN50, and a Poincaré scatter plot for visual heart rate variability analysis.
HeartLab also includes an AI assistant that explains your ECG findings in plain language, generates shareable PDF reports for your doctor, calculates a comprehensive cardiac score, and tracks trends over time. All processing happens on-device for maximum privacy.
Why Choose Apple Watch Built-in ECG
Apple Watch ECG is the simplest option. It requires zero setup beyond the Health app, is FDA-cleared for AFib detection, and supports 40+ languages natively. If you only need basic AFib screening and prefer an Apple-integrated experience, the built-in ECG app works well. It is also completely free with no subscription required.
Apple's ECG is a good starting point, but many users who want deeper insights turn to apps like HeartLab for more comprehensive analysis.
FAQ
Does HeartLab use the same data as Apple Watch ECG?
Yes. HeartLab reads the exact same ECG recordings captured by your Apple Watch hardware. It simply performs a deeper, more comprehensive analysis on that data, detecting arrhythmias like PVC, PAC, and bigeminy that Apple's built-in app cannot identify.
Is Apple Watch ECG FDA-cleared?
Yes, Apple Watch ECG is FDA-cleared (De Novo) for AFib detection in adults 22 and older. HeartLab is not FDA-cleared but provides clinical-grade algorithms for a wider range of arrhythmia detection.
Can HeartLab detect AFib like Apple Watch?
Yes. HeartLab detects atrial fibrillation plus additional arrhythmias including PVCs, PACs, bigeminy, and trigeminy that Apple Watch ECG cannot detect.
Do I need to pay for HeartLab?
HeartLab offers a free tier with core ECG analysis. Advanced features like the AI assistant, PDF reports, and unlimited history are available via subscription.
Which app has better privacy?
Both are excellent for privacy. Apple Watch ECG and HeartLab both process ECG data on-device. HeartLab never sends your health data to external servers.
Information accurate as of February 2026. Features and pricing may change. Check respective app stores for the latest details. HeartLab is not a medical device and does not replace professional medical advice.
Get Advanced ECG Analysis on Your Wrist
HeartLab delivers clinical-grade ECG analysis directly from your Apple Watch — arrhythmia detection, HRV analysis, and professional reports.
