Estimating scalability in mobile app development involves evaluating several factors: Performance Metrics: Monitoring current app performance metrics like response time, load time, and server response under varying loads. Stress Testing: Conducting stress tests to see how the app performs under extreme conditions and identifying bottlenecks. Resource Utilization: Analyzing how the app uses CPU, memory, and network resources under different loads. Architecture Review: Ensuring the app’s architecture is modular and can handle increased loads by adding more resources or instances. Database Load: Estimating how database queries scale with more users and data and planning for database scaling solutions like sharding, indexing, and read replicas.