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The total number of screens, unique user roles, and advanced functionalities (like AI integrations, real-time sync, or complex hardware use) significantly impact the required engineering hours.
Custom animations, highly polished UI elements, and bespoke premium branding require additional iterations compared to a standard, functional MVP design.
Adding strict regulatory compliance (HIPAA, SOC2, PCI-DSS) requires specialized architecture, detailed auditing, and rigorous penetration testing.
Building truly native apps (Swift/Kotlin) separately generally doubles frontend engineering costs versus using cross-platform tools like React Native or Flutter.