Approximately 9% of the general population suffer from addictions or substance abuse. The total cost of addiction treatment and prevention is estimated at over $500 billion a year in the USA. The relapse rate in addiction varies from 60 to 85% within one year after the treatment, and only in the case of prescribed opioids results in 48,000 deaths each year in the USA. Predict Watch was founded in 2016 as an academic spin-off. Using smartwatches and smartphones, we have developed robust methods allowing for relapse prediction with over 85% accuracy even 48 hours in advance.