Digital diabetes management apps have shown promise in improving glucose control among patients globally. However, their implementation and acceptance within Zambian secondary schools remain understudied. A mixed-methods approach was employed, including quantitative surveys to measure app usage frequency and qualitative interviews for deeper understanding of user experiences. Data were collected from 10 schools across Zambia's major urban areas. Teachers reported an average daily use rate of 45% among their students, with significant variation in acceptance levels based on school type (public vs. private). The digital diabetes management apps successfully integrated into Zambian secondary schools but faced challenges related to teacher and student engagement. Further tailored training programmes for teachers and ongoing app updates are recommended to enhance user satisfaction and efficacy. Treatment effect was estimated with $\text{logit}(p_i)=\beta_0+\beta^\top X_i$, and uncertainty reported using confidence-interval based inference.