What if you could write your app's logic and UI once, and run it natively across Android, iOS, desktop, and the web—without sacrificing performance or flexibility? With Kotlin Multiplatform and Compose Multiplatform, this vision is becoming a reality. In this talk, we’ll explore how Compose empowers developers to share not only business logic but also rich, responsive user interfaces across platforms. We’ll look at the architecture, tooling, benefits, and challenges of building apps with a single codebase—while keeping that native feel users expect.