Adolescent reproductive health (ARH) education is crucial for young people’s well-being in Kenya and globally. Mobile learning applications offer a convenient way to deliver ARH knowledge, but their adoption rates and effectiveness are not fully understood. A mixed-methods approach was employed, including surveys (N=300) to assess app usage and attitudes before and after implementation, and interviews (n=25) with school administrators and teachers to gather insights into the mobile learning environment. The one-year adoption rate of the ARH mobile apps in Kenyan schools was found to be 68%, indicating moderate uptake. Pre- and post-intervention surveys showed a significant increase in students' knowledge about ARH (p<0.05, Cohen's d=0.72). Mobile learning applications for ARH have shown promise in Kenyan schools, with notable improvements in student knowledge. Further research should explore the long-term effects and potential scaling of these apps across different school settings.