KMM lets you write shared business logic in Kotlin -- networking, data models, validation, caching -- that runs on both Android and iOS, while keeping the UI native on each platform. It's a good fit when you have significant business logic that shouldn't be duplicated, want native UI on both platforms, and have a team comfortable with Kotlin. It's not a silver bullet -- the shared module still needs to be designed carefully, and iOS integration requires bridging code. We assess whether KMM is the right architecture for your specific project.