KMP vs Flutter vs React Native
How KMP's native-interop approach differs from other cross-platform stacks.
KMP vs Flutter vs React Native is a free Kotlin Multiplatform Academy lesson on CoddyKit — lesson 2 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Kotlin Multiplatform Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
Three Popular Choices
Flutter, React Native, and KMP all promise cross-platform apps. But they take very different approaches under the hood. Let's compare. 🧭
How Flutter Works
Flutter draws its own pixels with a custom engine. It ships a rendering engine that paints UI itself instead of using native widgets.
How React Native Works
React Native runs JavaScript and maps it onto real native views through a bridge. Your logic lives in JS, the widgets are native.
How KMP Works
KMP compiles Kotlin straight to each platform's native code. There is no extra runtime; it relies on direct native interop.
The UI Difference
Flutter and React Native usually own the whole UI. KMP often shares only logic and lets you keep a fully native UI per platform.
Language Differences
Flutter uses Dart, React Native uses JavaScript, and KMP uses Kotlin. Android teams often already know Kotlin, so the ramp is short.
No Bridge Tax
Because KMP compiles to native, there is no JavaScript bridge in the middle. That removes a common source of overhead and quirks.
Calling Native Code
KMP can call platform APIs directly when needed. This easy access to native APIs means you are never locked out of the OS.
Adopt Gradually
You can add KMP to an existing app one shared module at a time. This incremental adoption is harder with all-in-one frameworks.
Optional Shared UI
KMP can share UI too, using Compose Multiplatform. But unlike the others, sharing UI stays optional rather than required.
Pick by Your Team
There is no single winner. Your team's skills, native needs, and how native you want the UI all guide the right choice.
Quick Check
Let's contrast the approaches.
Recap
Flutter paints its own UI, React Native bridges to JS, and KMP compiles to native and shares logic. Choose by your team and native needs. ✅
Frequently asked questions
Is the “KMP vs Flutter vs React Native” lesson free?
Yes — the full text of “KMP vs Flutter vs React Native” is free to read here on the web, and the Kotlin Multiplatform Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Kotlin Multiplatform Academy course, upgrade to CoddyKit PRO.
What will I learn in “KMP vs Flutter vs React Native”?
How KMP's native-interop approach differs from other cross-platform stacks. You practise Kotlin Multiplatform Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Kotlin Multiplatform Academy?
No prior experience is required. Kotlin Multiplatform Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 2 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “KMP vs Flutter vs React Native” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Kotlin Multiplatform Academy lesson?
Yes. Every Kotlin Multiplatform Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Share Logic, Not UI: The KMP Promise
- KMP vs Flutter vs React Native
- Targets: Android, iOS, Desktop, Web, Server
- What You Can and Cannot Share Yet