Kotlin Multiplatform vs Flutter for Enterprise Mobile in 2026

Pros

• Native UI: platform-specific UI uses SwiftUI/UIKit (iOS) and Compose (Android) — true native feel
• Gradual adoption: add KMP to existing native apps without a rewrite
• Share what makes sense: business logic, networking, data models — keep UI native
• JetBrains + Google backing: strong long-term support, especially for Android/Compose
• Kotlin everywhere: share code with Kotlin backend (Ktor, Spring) — language consistency

Cons

• Two UI codebases: writing SwiftUI + Compose doubles UI development time vs Flutter
• Requires iOS (Swift/Objective-C) AND Android (Kotlin) expertise — harder to staff one team
• KMP ecosystem still maturing: fewer multiplatform libraries than Flutter's pub.dev
• No Desktop or Web UI (Compose Multiplatform adds this but is less mature than Flutter)

Pros

• Single codebase: one Dart developer can ship iOS + Android + Web + Desktop
• Consistent UI: identical pixel-perfect output across platforms — no platform UI divergence
• Fastest single-team shipping: one codebase, one test suite, one CI pipeline
• Impeller renderer: smooth 60/120fps animations without jank on both platforms
• pub.dev: 40K+ packages including platform-specific plugins for camera, sensors, Bluetooth

Cons

• Not native UI: Flutter widgets don't use UIKit/SwiftUI — accessibility and platform conventions require effort
• Dart: smaller talent pool than Kotlin/Swift for enterprise hiring
• Existing native app integration is harder — requires platform channels for deep native APIs
• Large app: Flutter adds ~4MB to binary size + Dart runtime