Koin is a dependency injection framework for Kotlin applications that manages object lifetimes and resolves dependencies through a lightweight container. It functions as a multiplatform library, allowing shared object definitions and resource bindings to be reused across different target platforms and source sets.
The framework provides a system for resolving dependencies directly within user interface components to decouple business logic from view implementations. It includes a compile-time dependency validator that analyzes dependency graphs during the build process to detect missing bindings and configuration errors.
Capability coverage extends to application dependency management across Android apps, server-side environments, and UI state handling. It integrates with platform-specific contexts such as Android application lifecycles, Jetpack Compose UI components, and Ktor server applications. Developer tooling includes IDE assistance for inspecting project dependencies and navigating configuration wiring.
