Manage your cravings, stress and triggers - and take control so you can reduce your use days.






You have the ability to transform how you feel. It’s a skill, and we’re here to help you build it. In combination with your clinical treatment, Lief will teach you how to train your body to stay calm and focused when you need it most - and help break the cycle of cravings and use.
In one study patients using the Lief alongside treatment as usual lowered average use days by 64% vs treatment alone.


Lief measures your heart and breath to track your stress levels in real-time, using a clinically-proven biomarker of stress called heart rate variability (HRV).
When you're under pressure, learn to control your body's natural stress response through gentle, safe HRV biofeedback exercises. Practice when you need it by following the vibrations. It's just 3 minutes, and you can do it anywhere.


As your average HRV increases, you'll feel the difference and experience the power of calming your mind on-demand.
By intervening early, you'll reduce cravings and be better equiped to manage them when they do arise.
In one Harvard study, patients using Lief (plus treatment) reduced use days by 64% when compared to a control group with just treatment as usual.
Lief improves your heart rate variability, a scientifically-proven biomarker of mental health. Follow the vibrations to build awareness of your triggers, then self-regulate in the moments you need it most.
Lief is supported by Stanford-trained clinical psychologists, therapists and health coaches who care deeply about your mental health.
Take your training goals to the next level with live chat and video sessions. Use as little or as much as you need.


We’re a drug-free solution to stress and worry backed by empirical research, as well as decades of evidence on heart rate variability biofeedback.




