Kotlin Multiplatform Development & Migration

For the full story, read Shared logic first: KMP and Compose Multiplatform in 2026. We cover native UI vs shared UI, CMP, and migration tradeoffs in depth.

When KMP Is Worth It

• You have separate iOS and Android codebases and shipping features takes twice as long as it should; the same domain logic lives in two places and both need to stay in sync.
• You're building a new product targeting multiple platforms and want shared business logic from day one, without being locked into a framework that compromises native UI or platform behavior.
• You're in the Kotlin/JVM ecosystem and want shared logic between a desktop app and a mobile client without duplicating domain code across both.
• You tried Flutter or React Native and hit performance, native-feel, or platform API limitations you can't accept.
• You've heard about KMP but want someone who has shipped it to tell you honestly, before you commit, whether it fits your situation.

What Kotlin Multiplatform Changes

KMP lets you write your business logic (authentication, networking, data models, validation, domain rules) once in Kotlin and share it across iOS, Android, desktop (JVM/macOS), and/or web (Kotlin/Wasm). Each platform keeps its own UI layer, so users get the experience they expect while your team maintains one source of truth for the logic underneath.

Google officially recommends KMP for sharing business logic between Android and iOS. JetBrains declared the core framework stable in November 2023, and companies like Netflix, McDonald's, and Cash App run it in production today.

How We Use KMP

We don't push KMP on every project. We recommend it when it genuinely reduces your cost of change and speeds up delivery:

• New cross-platform products: Start with shared logic from day one. Reach mobile, desktop, and/or web in one timeline instead of maintaining separate codebases.
• Migration audits: If the same product already spans separate codebases across platforms, for example native iOS and Android, or a mobile app alongside web or desktop; we evaluate which layers of business logic can move into shared KMP modules and how to do it incrementally, without a risky rewrite.
• Compose Multiplatform pilots: When your team wants to share UI code in addition to logic, CMP is a strong option: stable on Android, iOS, and desktop today, with web support currently in beta. We help you evaluate fit and adopt it at a pace that matches your risk tolerance.

Native UI vs. Shared UI: the Trade-off We'll Be Honest About

KMP's core advantage over other cross-platform tools is that your UI can remain fully native per platform. We still build SwiftUI on iOS and Jetpack Compose on Android; the shared layer handles the logic underneath, not the pixels on screen. If your product demands an Apple-level or premium Android feel, that option is always on the table.

For teams that also want to share UI code, Compose Multiplatform delivers: stable on Android, iOS, and desktop today, with web in active beta. When pixel-perfect platform fidelity matters less than development speed across many targets, CMP is a compelling choice, and we'll tell you honestly which trade-off is right for your product, not which one is more interesting to build.

See how we approach native Android UI in our Android UI / UX case study, and how we structure architecture and data layers in our Android feature development case study.