Meet Lief: a smart patch with a discreet design that stays under your shirt and helps you manage stress. It measures your HRV, breathing rate and consistency and vibrates to guide you when you are stressed. Just a few minutes of breathing with your heart improves your stress response, so you can stay focused.
The patch is 6mm thin. It can serve as a 3-axis motion tracker too. The companion app helps you make sense of your mood, stress level, and other data.