Can your voice warn of heart failure weeks before it happens?

Cordio Medical’s HearO builds a model of a heart-failure patient’s voice from short daily phone recordings and flags changes tied to fluid in the lungs. In the blinded 563-patient DETECT-HF trial it predicted over 70% of events an average of 24.6 days early — promising, early-stage, and not FDA-cleared yet. Here is what it can and cannot do.

Your phone already listens to your voice every day. A medical startup is betting that same voice can flag a failing heart weeks before you feel it.Short answer: Cordio Medical’s HearO app asks heart-failure patients to record a short voice clip on their smartphone each day. The software builds a model of that one patient’s normal voice, then watches for subtle shifts linked to fluid building up in the lungs — one of the earliest warning signs that heart failure is getting worse.Why it might work: extra fluid changes how the lungs and airway resonate, which nudges pitch and breathiness in ways a person cannot hear but a patient-specific model can measure.

Because the comparison is you against your own baseline — not against a population average — small personal changes stand out sooner.What the evidence actually shows, stated plainly:1. The trial: in the blinded, 563-patient DETECT-HF pivotal trial, presented at the American Heart Association’s Scientific Sessions in Chicago, Nov. 6–9, 2026, HearO predicted over 70% of heart failure events an average of 24.6 days before they happened.2.

The limits: over 70% caught also means some events were missed, and an early warning only helps if a care team acts on it. A prediction is not a diagnosis.3. The status: HearO holds an FDA breakthrough device designation (granted in 2021) and a European CE mark, but it is not FDA-cleared yet.

Cordio plans to file for clearance, with a US launch anticipated in 2027. You cannot download and use it today.4. Who it is for: people already diagnosed with heart failure, as an add-on to their care team — not a screening toy for the worried well.Pro tip: do not wait for an app.

The proven daily habit is still the boring one: weigh yourself each morning and call your care team about a sudden gain — roughly 2–3 pounds in a day, or 5 in a week, is the classic fluid warning.