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The SonoHealth EKGraph and the Apple Watch ECG app are both FDA-cleared single-lead ECGs that record your heart’s rhythm in about 30 seconds and can flag possible atrial fibrillation. The core difference is that the EKGraph is a dedicated $79 device with its own screen and no ecosystem lock-in, while the Apple Watch bundles ECG into a smartwatch you wear all day but requires an Apple Watch plus iPhone. Neither replaces a clinical 12-lead EKG or diagnoses heart disease.
Neither device can rule out a heart attack. If you have chest pain or pressure, fainting, or severe shortness of breath, call 911 — do not stop to record a trace.

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What do they have in common?

Both are single-lead ECGs cleared by the FDA for home use, both capture a roughly 30-second trace, and both can flag possible atrial fibrillation as a prompt to seek care. Both are screening and tracking tools, not diagnostic machines — see what a home EKG can and can’t tell you.

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How are they different?

Specs for the EKGraph are grounded in its product facts; confirm current Apple Watch details on Apple’s site. For the broader category view, see personal EKG vs. smartwatch.

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Which is easier when a symptom hits?

If you own a compatible Apple Watch, “always on your wrist” is convenient for catching a random flutter. But the EKGraph’s built-in screen shows a classification — No Abnormalities, Arrhythmia, Bradycardia, Tachycardia, and more — without unlocking a phone, and it can be shared with a spouse or older parent who doesn’t wear a smartwatch. For tips that apply to either, see how to take a good reading.

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Which should you choose?

If you already wear a recent Apple Watch and live in that ecosystem, its built-in ECG is handy and worth using. If you want an affordable, self-contained recorder — no smartwatch, no phone required to see a result, no subscription, and shareable across a household — the EKGraph is the more direct fit. Either way, treat any flag as a screening prompt and review it with your clinician.
A personal ECG documents and tracks your heart rhythm; it does not diagnose heart disease. Confirm any abnormal finding with a healthcare professional — see when to see a doctor.
Related: Personal EKG vs. Smartwatch · EKGraph vs. KardiaMobile · How to Choose a Personal EKG Monitor · Best Portable EKG Under $100 · Single-Lead vs. 12-Lead