Kotlin Multiplatform has crossed the threshold from "exciting experiment" to "stable platform." JetBrains declared KMP stable in late 2023, the tooling has matured significantly since, and enterprise adoption from Netflix, VMware, and McDonald's has provided real-world validation. But for large-scale enterprise adoption, there are still meaningful trade-offs to understand.
What KMP Actually Shares (and What It Doesn't)
KMP shares business logic written in Kotlin: data models, repositories, use cases, network clients (Ktor), database access (SQLDelight), and state management (Kotlin Flows). What it doesn't share: UI. Each platform (Android, iOS, web) has its own UI layer. Compose Multiplatform can share UI for most platforms, but on iOS it renders its own UI — not SwiftUI — which has integration implications.
The iOS Integration Reality
KMP shared modules integrate into iOS as XCFrameworks. The developer experience from the Swift side is functional but requires care: suspend functions become callbacks in Swift (Kotlin Coroutines don't map 1:1), Generics from Kotlin are partially erased in the ObjC API boundary, and debugging into KMP code from Xcode requires specific tooling setup. An iOS developer new to KMP will face a meaningful learning curve.
Where KMP Genuinely Excels in Enterprise
KMP's strongest enterprise case: shared validation logic (form rules, business constraints) that must be identical on Android and iOS. Shared analytics tracking (same event schema, same property names, guaranteed). Shared cryptography and data transformation layers. Shared offline sync logic. For these use cases, KMP eliminates entire categories of "we fixed it on Android but forgot iOS" bugs.
Hiring and Team Dynamics
The enterprise reality: KMP requires developers comfortable with Kotlin on both ends and Swift developers who understand the KMP integration layer. Finding developers with both skills is harder than finding pure Android or pure iOS developers. Large enterprises often form a KMP platform team that owns the shared module, with platform teams consuming it — this structure works well but requires organisational alignment.
KMP vs Flutter for Enterprise Cross-Platform
The comparison is more nuanced than "both share code." Flutter shares UI; KMP shares logic. Choose KMP when: you have existing native Android/iOS apps you're evolving (not rewriting), you want platform-native UI on both platforms, and you have Kotlin expertise on the team. Choose Flutter when: you're building from scratch, you want a single UI codebase, or your team primarily knows Dart/JS.
The 2026 Recommendation
KMP is enterprise-ready for shared business logic in new and greenfield projects. For large existing codebases, adopt incrementally — start with one isolated module (network client, local database, analytics). Don't attempt a full rewrite. The teams succeeding with KMP at scale adopted it module by module over 12–18 months, not in a big-bang migration.