What is Flutter and what problem does it solve compared to React Native, Ionic, and Xamarin?

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Flutter is Google's open-source UI toolkit (alpha 2017, stable 1.0 in December 2018) for building natively compiled applications for mobile, web, desktop, and embedded — from a single Dart codebase. What makes Flutter different from other cross-platform frameworks: Flutter paints every pixel itself via its own rendering engine ( Skia , transitioning to Impeller ) — it does NOT wrap native widgets. AOT-compiled to native ARM machine code for release builds — no JavaScript bridge, no interpreter at runtime. Identical UI on every platform by design (with Cupertino + Material widget sets when you want platform feel). vs Competitors: React Native — JS bridge to native widgets; UI inconsistencies across platforms; familiar to web devs. Ionic — WebView-based (HTML/CSS/JS); easiest to learn but worst performance. Xamarin / .NET MAUI — C# binding to native widgets; declining mindshare. Flutter — own renderer + AOT-compiled Dart; consistent UI, near-native performance. Don't define Flutter just as 'a cross-platform framework' — every framework claims that. The differentiators that matter: (1) **Flutter paints every pixel itself** via Skia/Impeller — it doesn't wrap native widgets like React Native does; (2) **single Dart codebase compiles AOT to native ARM** for release, so performance is closer to native than to JS-bridge frameworks; (3) **identical UI on every platform** by design. Drop the names Skia/Impeller and AOT — they signal you know what's under the hood.