ParentApp study: parenting app cuts violence against teen girls by 67%

A low-cost parenting app cut reported sexual violence against adolescent girls by 67% over a year in a large trial in Tanzania, according to a study led by the University of Oxford and published in The Lancet, announced on Wednesday, 11 November 2026. The trial of ParentApp for Teens involved nearly 2,400 adolescents and their caregivers in the Mwanza region. The researchers estimate the programme could be delivered at scale for about $6 per family, far below the cost of in-person parenting classes.

Parenting programmes that teach caregivers to talk with their teenagers, set rules calmly, supervise them and spot risks usually depend on trained facilitators meeting families in person, which the researchers estimate costs about $120 per family and is hard to expand. ParentApp tries to deliver the same support through a phone app that families can use on their own time, combined with group sessions. If a digital version can produce results this large, it becomes possible to reach far more families for the same budget.

The findings put the family at the centre of protecting children. The programme does not target young people alone; it works through the parents and caregivers who see them every day, strengthening their relationship and their ability to notice when something is wrong. That reflects a principle common to many cultures: that a close, communicating family is a child's first protection.

The results also come with limits that matter. The trial was in one region of Tanzania, the reductions for boys were not statistically significant, and the figures here come from the university's release and press coverage rather than a reading of the full paper. Results from one country cannot be assumed to carry over unchanged to India or elsewhere, where family structures and phone access differ.

For India, which has many families with smartphones and a large number of adolescents, the study is relevant to how child protection and parenting support could be offered at low cost, though any programme would need testing in Indian settings first.

Peepals calculation: In-person delivery at about $120 per family costs roughly 20 times the app's estimated $6 per family at scale (120 ÷ 6 = 20). Even with smartphones provided to one in five families, at about $10, the app costs about one-twelfth of in-person delivery (120 ÷ 10 = 12). A 67% drop means that for every 100 girls who would otherwise report sexual violence in a year, about 33 did so in the ParentApp group. Our calculation from the reported figures.

Short-term: Governments and agencies working on child protection have new trial evidence that a digital parenting programme can reduce violence against adolescent girls at low cost.

Long-term: If the results hold up in other countries, app-based parenting support could become a standard, affordable part of child protection programmes, reaching families that in-person services never get to.

Who is affected: Parents and caregivers of teenagers, adolescent girls, child protection agencies and governments, and researchers working on violence prevention.

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