Researchers at Washington University School of Medicine in St. Louis found that a free smartphone app significantly reduced opioid and non-opioid drug use among people experiencing housing insecurity.
It’s a population that faces some of the steepest barriers to addiction treatment.
Why Housing Instability Makes Addiction Treatment So Difficult
People without stable housing are far more likely to experience overdose and far less likely to receive treatment for substance use disorder than those with secure housing.
Inconsistent access to care, greater mental health burdens and the daily demands of survival all work against sustained engagement with traditional addiction treatment programs.
Yet fewer than one in five people with substance use disorder in the United States receive any treatment at all. The gap is even wider among people experiencing homelessness or housing insecurity.
According to Rehab.com’s drug use statistics, an estimated one in four deaths among the homeless population are attributed to drug overdose.
There are over 582,000 people experiencing homelessness in the U.S., and 16% of homeless individuals report having a substance use disorder.
Washington D.C. leads the nation in both per capita homeless rates and overdose-related deaths within that population.
It’s a stark illustration of how concentrated the crisis becomes when housing instability and substance use disorder converge. You can explore top ranked drug rehab centers in Washington, D.C. to start receiving support today.
What the App Does
The uMAT-R app (pronounced “you matter”) was developed in 2018 by a team led by Dr. Patricia Cavazos-Rehg, a professor in WashU’s Department of Psychiatry. The app is free and runs on both iOS and Android devices.
It provides users with information on local treatment options and social support resources, a sobriety tracker and educational content on managing withdrawal and maintaining recovery.
A built-in chat feature connects users with trained coaches, called “e-coaches,” available Monday through Friday.
The design was inspired by online addiction-support communities, where Cavazos-Rehg observed people seeking clinical information and peer support even at their most isolated moments.
Funding from the Missouri Department of Mental Health helped bring the app to scale.
What the Study Found
The research, published February 1 in Drug and Alcohol Dependence, drew on data from 972 uMAT-R enrollees collected between 2020 and 2024.
More than 70% identified as having insecure housing. Of those, 378 completed a follow-up survey after one month of use.
The results were notable. Participants who used the app were roughly 50% less likely to have used non-opioid illicit drugs after one month compared to those who did not engage with it.
Among those who used the e-coach chat feature specifically, the likelihood of opioid use was also about 50% lower. Higher overall app engagement was linked to greater reductions in drug use across the board.
Beyond substance use, the app also showed measurable mental health benefits.
Users reported reduced cravings, lower feelings of being a burden to others and improved social connectedness, factors that research links to more successful addiction treatment outcomes.
The Broader Crisis These Findings Address
The WashU study doesn’t exist in a vacuum. It arrives at a moment when national data paint a complicated picture. Overdose deaths dipped modestly in 2024, but the underlying problem remains vast and unevenly distributed.
The states with the highest per capita scores, and therefore the most severe addiction impact, are concentrated in the South and mid-Atlantic, including West Virginia, Tennessee, Kentucky, South Carolina and Louisiana, as well as Washington D.C.
These are also regions where homelessness and housing instability tend to intersect with opioid prevalence, making tools like uMAT-R especially relevant.
That rising cost reflects not just the scale of the crisis, but the insufficient reach of traditional addiction treatment.
Scalable, low-cost digital tools represent one avenue for closing the gap, particularly for populations traditional systems rarely serve.
What This Means for Treatment Seekers
For people who use substances and lack stable housing, a smartphone app may be a meaningful bridge to recovery support when in-person care is out of reach.
The study shows that digital tools can improve engagement with addiction treatment and reduce drug use even among populations often considered difficult to serve.
Anyone in this situation, or supporting someone who is, may benefit from asking a treatment center or emergency department about enrollment in digital recovery programs alongside other options.
Finding the Right Addiction Treatment
If you or someone you care about is struggling with substance use, exploring treatment options early makes a difference
Rehab.com’s directory includes thousands of verified treatment centers across the country. Call
800-985-8516
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