sixbpm

Sixbpm is a free web app that uses your phone's accelerometer to monitor your breathing and guide you through a 15-minute session at six breaths per minute. Place your phone face-down on your chest, and the app listens to your breathing for one minute, then plays two tones—one for inhale, one for exhale—gradually slowing them down. This breathing rate aligns with your cardiovascular system's resonance frequency, designed to increase heart rate variability and vagal tone.

The protocol is based on research from the early 2000s and mirrors the approach used by the FDA-cleared RESPeRATE device. The maker built it with help from an LLM to address personal stress and headache management. No installation or account is needed—just open the page and start.