Free answer · verified July 2026
Which stack should I pick for my first app?
Start by answering one question: what is your desktop client? If it's a web app or Electron, default to React Native with Expo, because you share a TypeScript core, a hiring pool, and your agent's strongest training data with the web. If your desktop is a true native app, or you're mobile-only, default to Flutter for the highest code sharing and the fastest iteration loop. The benchmark wars matter least; for a typical consumer app, users can't tell the frameworks apart.
Why the desktop client decides the mobile stack
This is the fork most guides miss. A stack choice is a one-way-ish door: switching frameworks after launch is close to a rewrite, because the UI layer, the native-module glue, and your accumulated skill all go with it. So the deciding factor should be the one with the longest reach, and that’s what your other client is. A React/TypeScript web or Electron desktop client shares a language, validation and business-logic packages, and a hiring pool with React Native. A native Windows/macOS desktop shares the most with Flutter, whose desktop targets are production-grade. Mobile-only removes the web penalty entirely, and Flutter’s tighter inner loop wins.
What about the benchmarks?
The widely circulated numbers (“Flutter cold-starts at 2.1s vs React Native 2.8s”) trace to content-farm blogs with no stated device, no release-vs-debug build, and no reproducible method. The reference checked them against primary sources and refuses to repeat them. The defensible statement is narrower: Flutter’s ahead-of-time compilation and its own renderer give it lower frame-time variance, while React Native’s New Architecture closed most of the felt gap. For a standard list-and-detail consumer app, pick on ecosystem fit, your team, and your desktop client.
Because you're building with an AI agent
One more honest point: coding agents are trained on far more TypeScript/React than Dart/Flutter, so for non-trivial UI they tend to produce more idiomatic React Native. Treat that as a mild point toward the JS stack, and treat any “AI cuts Flutter dev time 40–60%” claim as what it is: a single unverified blog post.
Where this comes from
This is the published verdict line of one topic (ARC-006, Mobile stack) out of 389 in The App Masterclass. The orientation chapter is free in full, no signup, and the verification method behind every claim ispublic here.