Modern Flutter Authentication UI Kit (Material 3, Dark/Light, i18n EN/DE)
A polished, production-ready authentication starter built with Flutter and Material 3. It ships with dark & light themes, English and German localization, responsive layouts, and reusable UI components. Ideal for mobile apps, SaaS, and rapid prototypes when you want a clean, scalable auth flow without reinventing the wheel.

This kit includes all essential screens—Welcome, Login, Sign Up, Forgot Password, Two-Factor Authentication (2FA), Terms & Policy—and a consistent design system so you can move fast and keep quality high. Code is clean, well-documented (English comments), and structured for easy extension.

Note: This is a UI template. No backend is included. You can connect any auth provider later (e.g., Firebase, Supabase, custom API).

• Complete Auth Flow: Welcome (CTA), Login, Sign Up, Forgot Password, 2FA step, Terms & Policy confirm
• Material 3 Theming: Dark & Light modes, color system, typography, spacing scale
• Internationalization: English 🇬🇧 & German 🇩🇪 with ready-to-extend i18n setup
• Responsive Layout: Mobile-first, tablet-friendly, adaptive paddings & breakpoints
• Reusable Components: Text fields, social buttons (UI), validation helpers, shake/error animations
• Clean Architecture: Clear feature folders, separation of concerns, easy to plug in data/auth later
• Developer Friendly: Readable code, English comments, linted, ready for CI
• Scalable Design System: Tokens for colors/spacing/typography to keep UI consistent
• Extension-Ready: Add OAuth, passwordless, or multi-tenant flows without refactoring
• No Vendor Lock-In: Works with Firebase, Supabase, or your own API (not included)

What’s Included

• Full Flutter source code (Dart)
• Theming & localization setup (EN/DE)
• Example validators, animation utilities, reusable widgets
• README (HTML) with setup & customization guide
• Changelog & basic contribution notes

What’s Not Included

• No backend/auth service
• No paid third-party licenses

Flutter SDK: 3.16+ (Material 3 support)

Dart: 3.x

Platforms: Android Studio or Xcode for device builds; any editor (VS Code/Android Studio)

Dependencies: Standard Flutter packages only (declared in pubspec.yaml)

1. Get the code Download and unzip the package into your Flutter workspace.

Install dependencies

<b>
flutter pub get


</b>

Run the demo

<b>
flutter run


</b>

(Choose your emulator or a connected device.)

Customize

Update colors/typography in the theme files

Edit localization strings (EN/DE) and add more languages if needed

Wire up your auth provider (Firebase/Supabase/custom API) inside the placeholder service

Build

<b>
flutter build apk
# or
flutter build ios


</b>

👉 Full guide & screenshots: See the HTML README included in the package (link allowed in listing: [Open README]).