Pro Flutter Login App, Frontend, Backend, Firebase – Modern Minimal Flutter App for any Application

🏆 Title – SEO & Keyword-Rich

Pro Flutter Login App, Frontend & Firebase Backend – Email/Phone/Google/Apple Auth, MFA, Role-Based Access (GPL)

🚀 Overview

Pro Flutter Login App is a clean, minimal, and extensible Flutter authentication starter that ships with Firebase Auth, Firestore user profiles, and optional Cloud Functions for server-side logic. It’s built to help teams launch secure onboarding quickly—covering sign-up, sign-in, password reset, social providers, session persistence, and role-based access.

Experience (real-world relevance): The flow is modeled after production apps we’ve deployed—fast OTP handling, reliable session restoration, privacy-friendly analytics, and clear error states to reduce support tickets.

Target users: Indie devs, startups, agencies, and students who need a high-quality auth foundation for any Flutter app (SaaS, e-commerce, community, productivity, education, etc.).

✨ Key Features

• Authentication Methods – Email/password, phone OTP, Google and Apple sign-in, anonymous guest mode, and optional magic link.
• MFA & Security – Firebase multi-factor auth (TOTP/SMS), reCAPTCHA for phone, device-based session hardening.
• User Profiles – Firestore documents with display name, avatar, roles/claims, and preferences.
• Role-Based Access – Admin/Moderator/User via customClaims + Firestore Security Rules samples.
• Modern UI/UX – Minimal onboarding screens, password strength meter, error toasts, dark mode, accessibility.
• State Management – Ready for Riverpod (default) or Bloc templates; repository pattern for testability.
• Offline-Aware – Local persistence, connection banners, retry logic for flaky networks.
• Analytics & Crash Reporting – Hooks for Firebase Analytics & Crashlytics (optional).
• Localization – i18n with ARB files, RTL support, pluralization examples.
• Theming/Branding – Color tokens, typography scale, icon set, and app-store-ready assets.
• Testing – Unit, widget, and golden tests templates; mock auth repository examples.
• Web & Desktop – Flutter web/desktop stubs provided (primary target is mobile; see notes).

⚙️ Technical Stack (Expertise)

• Mobile App: Flutter (Dart), Riverpod/Bloc, GoRouter (or Navigator 2), Material 3, intl, freezed/json_serializable.
• Backend: Firebase Auth, Firestore, Cloud Functions (Node.js 18+ optional), Cloud Storage, Remote Config.
• Security: Firestore Security Rules, Storage Rules, App Check (device attestation), HTTPS Callable Functions.
• CI/CD (optional): fastlane, Codemagic/GitHub Actions workflows (build, test, code-signing).
• Minimum SDKs: Android SDK 23+; iOS 13+ (Xcode 15+ recommended).

🧩 Installation Guide

1. Create Firebase project: Enable Auth providers (Email, Phone, Google, Apple), Firestore, Storage, and (optional) Crashlytics/Analytics.
2. App registration: Add Android/iOS apps in Firebase console; download google-services.json and GoogleService-Info.plist.
3. Clone & configure: Place config files in platform folders; set packageId/bundleId, reverse client ID for Apple sign-in.
4. Install deps: Run flutter pub get; for Functions (optional) run npm i in functions/.
5. Security rules: Deploy provided Firestore/Storage Rules; configure customClaims script if using roles.
6. Run & test: flutter run on device/emulator; test email, phone, and social logins; verify session restore.
7. Build: flutter build apk / iOS archive; configure signing, app icons, and splash.

📦 Deliverables

• Flutter source code for the login/onboarding module (screens, widgets, services).
• Firebase integration (Auth, Firestore profiles, sample Functions).
• Security Rules templates (Firestore/Storage) with role examples.
• Branding assets (colors, icons, splash) and localization ARB files.
• Docs for configuration, testing, and deployment; CI/CD sample YAML.

📱 Supported Platforms

• Android: 6.0 (API 23)+; ARM64/ARMv7 builds.
• iOS: 13+ on iPhone/iPad; Apple/Intel simulators for dev.
• Web/Desktop: Supported as experimental templates; some auth providers require additional config (e.g., redirect domains, Apple JS).

🧠 Notes

• License: Distributed under the GPL for lawful learning, testing, and redistribution.
• Customization tips: Swap Riverpod for Bloc, plug in your design system, enable App Check, add re-authentication gates for sensitive actions, and enforce requireRecentLogin before account deletion.
• SEO assurance: Clean headings, descriptive copy, schema.org SoftwareApplication microdata, and lightweight assets improve discoverability on resource directories.
• Privacy & Compliance: Add privacy policy, consent dialogs for analytics, and Data Deletion flow to meet app-store requirements.
• Experience: Mirrors patterns used in production—robust error handling, network resilience, and secure rules-first design.

👨‍💻 Original Developer Credit (Authoritativeness)

Please support the original author/publisher and obtain official updates and support from the marketplace:
CodeCanyon – Original Author’s Listing.

🔒 Disclaimer (Trustworthiness)

This is a GPL redistribution intended for educational and archival purposes on GPL resource sites. We are not the original developer and provide no warranty or official support. Features may vary by release; test thoroughly before production. For commercial deployments and guaranteed updates, purchase a valid license directly from the original author. All trademarks and brand names remain the property of their respective owners.