What are the advantages and disadvantages of Flutter for cross-platform development?

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Accepted Answer

A balanced answer covers honest trade-offs, not just a sales pitch. Advantages: Single codebase → mobile, web, desktop, embedded. AOT-compiled to native ARM → near-native performance. Hot Reload — sub-second iteration (the killer feature). Pixel-perfect UI via own renderer (Skia / Impeller). Strong tooling (DevTools), 25K+ pub.dev packages. Disadvantages: ~5-7 MB minimum binary size (Engine + Dart VM ship with every app). Dart ecosystem smaller than JS / Kotlin / Swift. Platform-specific features (background tasks, push, niche hardware) still need plugins or native code. Weak for SEO-driven web (use Next.js / Astro instead). iOS feel needs explicit Cupertino widgets — it's not automatic. Pick Flutter for : greenfield mobile-first apps with custom-designed UI. Don't pick Flutter for : SEO-driven web, BLE/AR-heavy apps where you'd still write native, or rewriting a working native app from scratch. Don't just list pros — the senior signal is **owning the cons honestly**: app-size floor, weaker text/SEO story on web, native plugin gaps for niche hardware, and 'iOS feel needs Cupertino widgets, it's not automatic'. End with a **'when to pick / when not to pick'** matrix — that turns the question from a checklist into a judgment call.