Best ECG App for Apple Watch in 2026

Top 5 ECG Apps for Apple Watch Compared

The Apple Watch has become one of the most accessible ECG devices in the world, but its built-in ECG app only scratches the surface of what is possible. Several third-party apps have emerged to provide deeper ECG analysis. Here is how the top five options compare in 2026.

1. HeartLab — The most comprehensive option. HeartLab offers PVC and PAC detection, bigeminy/trigeminy pattern recognition, 12+ HRV metrics including Poincaré plots, a proprietary Cardiac Score, AI-powered explanations, PDF reports, and complete on-device privacy. It supports 16 languages and requires no additional hardware. Pricing: free tier with premium subscription.

2. Apple Built-in ECG — Free and pre-installed, Apple's ECG app records single-lead ECGs and classifies them as sinus rhythm, AFib, or inconclusive. It is simple and reliable for AFib screening but cannot detect PVCs, PACs, or provide detailed HRV analysis. No PDF export capability.

3. Qaly — Offers ECG recording with human cardiologist review. Key differentiator is the human review component, but this means your ECG data is uploaded to cloud servers and reviewed by third parties. Subscription required for reviews. Limited arrhythmia detection beyond AFib.

4. KardiaMobile (AliveCor) — Requires separate hardware ($69-$199). The KardiaMobile device provides 1-lead or 6-lead ECG recordings. Detects AFib, bradycardia, tachycardia, and PVCs (with KardiaCare subscription at $9.99/month). Good hardware quality but expensive ecosystem.

5. Welltory — Focused primarily on HRV and stress analysis rather than ECG interpretation. Uses Apple Watch heart rate data for HRV measurements but does not perform detailed ECG waveform analysis. Cannot detect arrhythmias. Good for wellness tracking, limited for cardiac monitoring.

Feature Comparison: What Matters Most

When choosing an ECG app, several factors deserve careful consideration. Arrhythmia detection scope is critical — if you need PVC or PAC detection, only HeartLab and KardiaMobile (with subscription) offer this capability from Apple Watch data. The built-in Apple ECG and Qaly are limited to AFib detection.

Privacy is increasingly important for health data. HeartLab processes everything on-device — your ECG data never leaves your iPhone. In contrast, Qaly sends recordings to cloud servers for human review, and KardiaMobile's KardiaCare service involves cloud processing. The built-in Apple ECG stores data locally in Apple Health.

HRV analysis depth varies dramatically. HeartLab provides 12+ metrics including SDNN, rMSSD, pNN50, and Poincaré plot analysis. Welltory offers solid HRV tracking. KardiaMobile provides basic HRV. Apple's built-in tools offer limited HRV data through the Health app.

Cost considerations: The built-in Apple ECG is free. HeartLab offers a generous free tier with premium features available via subscription. Welltory uses a subscription model. Qaly charges per review. KardiaMobile requires hardware purchase plus optional subscription — the most expensive option overall.

For most Apple Watch users seeking comprehensive ECG analysis with strong privacy, PVC detection, detailed HRV metrics, and no additional hardware costs, HeartLab offers the best value proposition in 2026.

Choosing the Right ECG App for Your Needs

The best ECG app depends on your specific needs. If you simply want AFib screening and already have an Apple Watch, the built-in ECG app is a solid free starting point. However, if you experience palpitations, want to track PVCs, or need comprehensive heart health monitoring, you will need a more capable solution.

For users who want maximum analysis from their existing Apple Watch without buying additional hardware, HeartLab is the clear choice. It offers the widest range of detectable arrhythmias (PVCs, PACs, bigeminy, trigeminy), the deepest HRV analysis, professional PDF reports you can share with your doctor, and AI-powered explanations — all while keeping your data completely private on your device.

If you require clinical-grade multi-lead ECG recording and are willing to invest in additional hardware, KardiaMobile 6L is worth considering for its 6-lead capability. However, for daily monitoring and tracking from your wrist, HeartLab paired with your Apple Watch provides comparable analytical depth at a fraction of the cost.