Scientists have created an early prototype called Pulse-Fi that can estimate a person’s heart rate using Wi-Fi signals, without wearables or physical contact. The system uses AI and low-cost, off-the-shelf hardware to analyze tiny changes in Wi-Fi signals caused by chest movement during breathing and heartbeats.

In tests, Pulse-Fi remained accurate across different distances (up to 3 meters), body positions, and light activities. Average error stayed below half a beat per minute, and in some cases was as low as 0.2 BPM. The setup relies on two simple Wi-Fi devices acting as a sender and receiver, extracting heart rate data from channel state information.

Researchers say this contact-free approach could one day be a cheaper alternative to smartwatches, though experts note the technology is still experimental and likely 5–10 years away from real-world use.

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