From Monolith iOS to Kotlin Multiplatform: SugarLite's Incremental Migration
SugarLite started as a pure iOS app built with SwiftUI + MVVM + Supabase Swift SDK. When the Android version became a priority, copying the business logic over to Kotlin would have doubled the maintenance burden — network layer, data models, and business rules all needed dual-platform upkeep. That’s why we chose Kotlin Multiplatform: the shared/ module carries all cross-platform business logic, while the iOS side only keeps SwiftUI and system framework calls (HealthKit, SwiftData, WidgetKit).





