To develop a parental control app, follow these steps. First, clearly define the app's objectives and features, such as website filtering, app blocking, screen time management, and monitoring capabilities. Conduct thorough market research to identify gaps and opportunities. Design an intuitive user interface (UI) for both parents and children. Create a secure account system for parents to manage their child's devices and implement strong data privacy measures. Develop a robust backend infrastructure to handle data processing and storage. Implement monitoring and control features based on the defined objectives. Test the app rigorously to identify and fix bugs. Address privacy concerns and comply with data protection laws. Launch the app and promote it to the target audience, and gather user feedback to improve and update the app regularly.