Inclusion Criteria:  Own an Android or iOS smartphone with an Australian mobile number. Be currently accessing outpatient treatment for alcohol problems. Participants with multiple drugs of concern are eligible as long as alcohol is one of the drugs of concern for the current episode of treatment. Have an Alcohol Use Disorders Identification Test (AUDIT) score of at least 8.  Exclusion Criteria:  Any residential rehabilitation within the past 4 weeks. Any form of inpatient treatment (e.g. hospital or residential withdrawal treatment) within the past week. Scheduled to enter inpatient/residential treatment within the next month.