Prep AI – The Ultimate AI Interview Coach App Template (Flutter)

Prep AI is a premium, feature-rich Flutter application designed to revolutionize interview preparation. By leveraging the power of dual AI engines (OpenAI GPT-4 and Google Gemini Pro), Prep AI offers an unparalleled interactive coaching experience. This template provides a complete, production-ready solution for anyone looking to launch a high-quality educational or career-focused app on iOS and Android — now with a full Flutter Web admin panel included.

Built with clean, robust architecture (Riverpod 2.x, GoRouter) and natively integrated with Firebase, RevenueCat, and Google AdMob, Prep AI is optimized for performance, scalability, and immediate monetization.

Test the Demo

Experience the power of Prep AI before you buy.

• Mobile (Android APK): Download Demo APK (Google Drive)
• Web Admin Panel: https://prepai-a06c9.web.app/
  Demo credentials — Email: admin@demo.com · Password: 123456
  The demo build keeps the AI Config and Prompts Editor screens read-only so reviewers can’t accidentally change the live mobile experience. Everything else (content CRUD, user management, analytics) is fully interactive.

Key Features

• Dual AI Engines: Seamlessly switch between OpenAI and Google Gemini APIs for dynamic interview feedback, with automatic cross-provider fallback and exponential-backoff retries.
• 4 Interactive Practice Modes:
  • Quick Practice: Fast, randomized questions for on-the-go training.
  • Category Practice: Focus on specific areas (e.g., Behavioral, Technical, Leadership).
  • Company Practice: Input any company name (e.g., Google, Meta, local startups) for tailored, culture-specific questions.
  • Full Mock Interview: A complete, simulated interview flow culminating in a detailed performance report.
• Advanced AI Scoring & Feedback: Every answer is evaluated dynamically across 5 distinct metrics: Clarity, Relevance, Structure, Confidence, and Depth. Get actionable tips, highlighted keywords, and ideal answer examples.
• Voice & Text Inputs: Users can answer via standard text, the structured STAR method template, or utilizing the integrated Speech-to-Text for a natural speaking experience.
• Comprehensive Tracking & Analytics: Track progress over time with beautiful, animated charts (Line charts, Radar/Spider charts) showing category strengths and recent session histories.
• 500+ Question Bank: A large, built-in repository of common interview questions, fully filterable by role and difficulty.
• AI Career Coach Chat: A dedicated, persistent chat interface to ask specific career-related questions (e.g., “How do I negotiate salary?”).
• Flutter Web Admin Panel: A complete admin dashboard built into the same codebase — manage questions and guides, search users, grant premium / promote admins, view cross-user analytics (sessions/day, average score, mode & provider breakdowns), and edit AI configuration and prompt templates without shipping a new mobile build.
• Editable Prompts & AI Config: Prompt templates, AI provider preference, and model names live in Firestore so live mobile clients pick up admin edits on the next snapshot — no rebuild needed.

Monetization Built-In

Prep AI is designed to start generating revenue from day one:

• Free Tier (Ad-Supported): Includes daily limits on questions, restricted categories, and basic feedback. Integrated with Google AdMob (Display & Interstitial ads).
• Premium Tier (Subscriptions): Unlocks unlimited access, all categories, full detailed AI feedback, and the choice of AI provider. Fully integrated with RevenueCat for effortless Apple App Store and Google Play subscription management.

Tech Stack & Architecture

• Framework: Flutter 3.x (Latest Stable) — mobile (iOS / Android) + web (admin panel)
• Language: Dart
• State Management: Riverpod 2.0+
• Routing: GoRouter (with fade transitions on web)
• Backend: Firebase (Auth, Firestore, Remote Config, Hosting, Cloud Messaging)
• Monetization: RevenueCat (Subscriptions) & Google AdMob (Ads)
• AI Integration: Direct API integration with OpenAI (GPT-4) and Google Gemini (1.5 Pro), with automatic cross-provider fallback and exponential-backoff retries

What You Get

• Full Flutter Source Code (iOS, Android, and Web admin)
• Clean, well-documented, and highly structured codebase
• Flutter Web Admin Panel source (same project, separate entry point) with Firebase Hosting wired up
• Firestore security rules & indexes ready to deploy
• Offline Documentation HTML files (Setup guides, Firebase config, API integration, Admin panel)
• Quick Start Guide
• Free future updates

Changelog

Version 1.1.0 — Web Admin Panel

• New Flutter Web admin panel (lib/main_admin.dart) with role-based access via a Firestore isAdmin flag.
• Question and Guide CRUD with live markdown preview for guide editing.
• User & subscription management — toggle admin, premium override, and disabled per user. Mobile premium state honors the override on the next Firestore snapshot.
• AI configuration and prompt templates moved into Firestore (config/app, config/prompts) so they can be changed without shipping a new mobile build. Hardcoded defaults remain as offline fallbacks.
• Analytics dashboard with cross-user collectionGroup('sessions') aggregation — sessions/day chart, mode and AI provider breakdowns, average score, 7/30/90-day windows.
• Firestore rules rewritten with admin-only write paths and an isAdmin() helper; collection-group sessions index enabled for analytics.
• Firebase Hosting wired up in firebase.json with SPA rewrites and cache headers.
• Web favicon and PWA icons updated to use the real app logo.
• Bug fix: session_screen.dart no longer hardcodes OpenAI / gpt-4o — the active provider and model name are read from AppConfig.

Version 1.0.0 — Initial Release

• Initial architecture and full feature implementation.
• Dual AI engine support (OpenAI and Gemini) with cross-provider fallback.
• 4 mock interview modes and dynamic AI scoring across 5 metrics.
• RevenueCat subscriptions and AdMob free-tier gating.
• Speech-to-text integration for voice answers.

Support & Contact

If you have any questions, run into issues during setup, or want to report a bug, we are here to help!

• Email: devsnack26@gmail.com
• WhatsApp: +855 967 413 911

Please include your Envato purchase code when reaching out for support.