Guides

Flutter SaaS guides

Practical write-ups of the patterns inside Template369, with the real code.

• AGENTS.md for Flutter: a free template and how to fill it in

  A template written for Flutter apps, what each section is for, and the mistakes that make agents ignore it.

• FlutterFlow vs a Flutter boilerplate: which to start with

  Code ownership, custom code, AI coding agents and cost, with FlutterFlow facts from its own docs.

• Responsive Flutter web: one app shell for phone, tablet and desktop

  Breakpoints, navigation that changes shape with the window, list-detail screens, and the MediaQuery vs LayoutBuilder trap.

• Flutter boilerplates compared (2026)

  The Flutter Kit, ApparenceKit, ShipFlutter, FlutFast, Very Good CLI and Template369 on price, refunds, payments and AI-agent support.

• Flutter subscriptions with Stripe on web and RevenueCat on mobile

  One Flutter codebase, two payment systems, and access checked in a single Firestore read.

• Build a Flutter app with Claude Code, Codex or Cursor

  How AGENTS.md and six skills keep an AI agent on your codebase's patterns.