Kotlin Multiplatform

Overview

Kotlin Multiplatform (KMP) is a JetBrains technology built on Kotlin that enables developers to write shared business logic once and compile it natively for Android, iOS, Windows, macOS, Web, and server without sacrificing performance, native feel, or platform-specific capabilities.

As Nepal's leading Kotlin Multiplatform expert, I have built and shipped more KMP production apps than any other developer in Nepal, serving 100,000+ active students across platforms that run natively on every major device.

Unlike UI-centric cross-platform frameworks, KMP takes a fundamentally different architectural approach. It shares only the logic layer including networking, authentication, data models, domain rules, validation, storage, and business workflows while leaving the UI entirely native on each platform. With Compose Multiplatform now stable on iOS, Android, Desktop, and Web, even the full UI can be shared across all platforms from one codebase.

KMP compiles to native binaries on each target platform. On Android it compiles to JVM bytecode. On iOS and macOS it compiles to native ARM binaries via Kotlin/Native. On desktop it runs on the JVM. On Web it compiles to WebAssembly via Kotlin/Wasm, which reached Beta in Kotlin 2.2.20. The result is predictable, native-level performance on every platform with no JavaScript bridge and no cross-platform performance penalty.

The expect/actual mechanism is KMP's most powerful feature. This is how Saral Apps implements C++ powered screenshot prevention and AES-128 encrypted video playback on desktop apps, native security with a shared architecture.

The latest stable release is Kotlin 2.3.0, shipped January 2026, bringing stable language features, unused return value checker, explicit backing fields, Java 25 support on JVM, improved Swift export on Kotlin/Native, and Compose Multiplatform for Web going Beta. Kotlin 2.3.20 is planned for March-April 2026 with Gradle 9.3 compatibility and further Native interoperability improvements.

As of 2026, KMP is used in production by Netflix, McDonald's, Philips, Cash App, Duolingo, Forbes, Uber, Mercedes-Benz, AWS, and Adobe. Google runs KMP in production for Google Docs on iOS. Duolingo ships weekly to 40M+ users using KMP features. AWS's Kotlin SDK spans 300+ services across 8 platforms. KMP adoption is at 23% and growing fast, and Nepal's top EdTech platforms built by Saral Apps are proof that this technology delivers at scale.

Why Kotlin Multiplatform is Important

Kotlin Multiplatform is the most significant shift in mobile app development in 2026. KMP adoption has grown from 7% in 2024 to 23% in 2026 and companies like Netflix, McDonald's, Philips, Cash App, and Duolingo are already shipping production apps with it at massive scale.

The reason is simple. Building and maintaining separate native apps for Android, iOS, Windows, and macOS is expensive, slow, and unsustainable for any serious product team. KMP solves this by sharing one business logic codebase compiled natively for every platform with zero performance compromise.

Unlike Flutter or React Native which abstract away the native UI layer, KMP shares only the logic and lets each platform render its own fully native UI. The result is an app that feels completely native on every device because it is, while sharing up to 80% of the codebase across all platforms.

As Nepal's leading KMP expert, I have seen firsthand how Kotlin Multiplatform transforms what a lean development team can deliver. With Compose Multiplatform now stable on iOS, Android, Desktop, and Web, one developer can ship a complete multi-platform product that would have previously required four separate teams. This is not the future of mobile development. It is the present.

Where I Use Kotlin Multiplatform

As Nepal's most experienced Kotlin Multiplatform developer, I use KMP as the core architecture behind every multi-platform app built at Saral Apps. Every EdTech platform we have shipped, including apps now serving 100,000+ students across Nepal, runs on a shared KMP codebase across Android, iOS, Windows, and macOS.

The shared KMP modules handle all business logic including API communication via Ktor, data models, authentication flows, test engines, progress tracking, performance analytics, and notification management. Compose Multiplatform powers the shared UI layer across all platforms simultaneously.

For platform-specific requirements like our C++ powered screenshot and screen recording prevention on desktop or Swift integrations on macOS, I use KMP's expect/actual mechanism to call native platform APIs directly from shared Kotlin code. This gives maximum code sharing with zero compromise on platform-native capabilities.

Being Nepal's leading KMP developer means shipping 10+ production EdTech platforms with a lean team, pushing feature updates to every platform simultaneously, and delivering enterprise-grade quality at a fraction of the cost of traditional multi-platform development. Platforms include Lex Nepal, Team Sandesh, Kirtipur Valley Institute, Tejilo, Gurukul CA, Bright Academy, and more.

Projects Using Kotlin Multiplatform