PostAI - AI Social Media Caption Generator & Content Creator Flutter App (Android & iOS)

PostAI is a complete Flutter mobile app that uses AI (OpenAI GPT-4o & Google Gemini) to generate social media captions, viral hooks, hashtag research, content repurposing, A/B testing, brand voice training, and content calendar management — all optimized per platform. Built with clean architecture, Riverpod state management, Firebase backend, and ready-to-publish monetization (RevenueCat + AdMob). Just add your API keys and launch. Key Features

• AI Caption Generator —PostAI Generate platform-optimized captions for Instagram, TikTok, LinkedIn, and Twitter/X. Choose tone, content type, and niche. Multiple captions per generation.
• Viral Hook Writer —PostAI 5 scroll-stopping opening hooks per topic across 6 styles: Curiosity, Controversy, Value, Story, Question, Bold Claim.
• Hashtag Research —PostAI Tiered hashtag packs (Mega 10M+, Mid 500K–10M, Niche under 500K) with real tag recommendations per platform.
• Content Repurpose Engine — Paste one piece of content and instantly adapt it to feel 100% native on every platform.
• Brand Voice Training — Train the AI on your writing style from examples. Apply your unique brand voice to all future generations.
• A/B Caption Tester — Objectively score and compare two captions with detailed breakdowns on hook strength, clarity, CTA, platform fit, and engagement potential.
• Content Calendar — Plan and schedule posts with AI-generated content ideas. Monthly grid view with status tracking (draft, scheduled, posted).
• Caption Library — Save, favorite, search, and filter all your generated captions by platform.

Supported Platforms

• Instagram — Long-form captions, 25 hashtags, emoji-rich
• TikTok — Short punchy captions, trending hooks
• LinkedIn — Professional storytelling, thought leadership
• Twitter / X — Under 280 chars, bold and opinionated

Dual AI Support

• OpenAI GPT-4o / GPT-4o-mini — Primary AI provider for high-quality generation
• Google Gemini — Secondary provider, switchable via Firebase Remote Config
• Hot-swap between providers without app update

Built-in Monetization

• RevenueCat — Subscription management (monthly/yearly) with premium entitlements
• AdMob — Banner and interstitial ads for free tier users
• Free Tier Limits — Configurable daily limits via Remote Config (5 captions, 3 hooks, 2 hashtags, 2 repurpose, 1 A/B test per day)
• Paywall Screen — Beautiful paywall with feature comparison

Authentication

• Email / Password registration & login
• Google Sign-In
• Apple Sign-In
• Forgot Password flow

Beautiful UI

• Warm coral-to-orange gradient brand identity
• Poppins typography throughout
• Full Dark Mode support with system preference detection
• Smooth animations (Lottie + Flutter Animate)
• Shimmer loading states on every async operation
• Illustrated empty states on all list screens
• Platform-colored badges, chips, and character counters

️ Tech Stack

• Flutter 3.24+ — Android & iOS from a single codebase
• Dart 3.5+ — Full sound null safety
• Riverpod 2.x — Reactive state management
• GoRouter — Declarative navigation with auth guards
• Firebase — Auth, Cloud Firestore, Remote Config, Cloud Messaging
• Dio — HTTP client for AI API calls
• Freezed — Immutable data models with JSON serialization
• Hive + SharedPreferences — Local storage
• Material 3 — Modern design system with custom theme extensions

What You Get

• Full Flutter source code (Android + iOS)
• Clean architecture with separation of concerns
• Offline HTML documentation with setup guide
• Firebase security rules included
• Step-by-step setup guide
• All AI prompt templates — fully customizable
• Ready for App Store and Play Store submission

Quick Setup

1. Create Firebase project (Auth + Firestore + Remote Config + FCM)
2. Add google-services.json and GoogleService-Info.plist
3. Set your OpenAI API key in Firebase Remote Config
4. Run flutter pub get and dart run build_runner build
5. Run the app — done!

Requirements

• Flutter SDK 3.24 or later
• Android Studio or VS Code
• Firebase project (Blaze plan recommended)
• OpenAI API key (GPT-4o access)
• Google Gemini API key (optional)
• RevenueCat account (for subscriptions)
• AdMob account (for ads

 

(Only For Premium Category Products !)

1. All digital products are the most recent version, with no possibility of free updates. After payment, you can request an update to the most recent version for 5 days if a new version is released. We free support within 5 days.

2. If a license is required (Excludes WHMCS license , we provide only method not license), please contact us via email or ticket for assistance with activation. Our license is only valid for activation and does not include support.

3. We provide Mobile, PHP script installation services for $19.90 / ₹1700. Please create a backup after installation as we do not support re-installation. For mobile app source code, we do not offer installation services.

4. If you have any questions, please contact us by email [email protected] or create a ticket on this page

5. Please note that any digital products presented on the website do not contain malicious code, viruses or advertising. You will receive the original files from the developers. We do not sell any products that have been downloaded from other websites.

6. The response time can last up to 6 hours.

(Only For Membership Category Products !)

Benefits of our Membership Plans

• Instant access to all plugins and all themes including all future releases
• Unlimited domain usage
• Regular Updates as of when available. Usually, updates are released daily.
• Before purchasing, please read the Terms and Conditions & Refund Policy.
• If you have any questions, please first read the FAQs.
• If you haven’t found the answer to your question, please contact us, and we will respond ASAP.
• Please note that any digital products on the website do not contain malicious code, viruses, or advertising. We buy the original files from the developers. We do not sell any products downloaded from other sites.
• Buy or download for FREE by subscribing to our VIP Membership Plan. Join the club of more than 1100+ happy members. This is the same theme as sold by the developer.

Updates:

• We offer frequent updates for one year from the date of purchase. After this period, you have to purchase the item again to receive further updates, we also offer lifetime updates as a second option.
• We regularly update products as soon as we are notified about an update, we go and download it from the author and update it on our site, but In case the current version of the product is not the latest, You can request an update for the product by contact form.
• We send regular emails advising when products have been updated so please be sure to provide an active email address when you sign up.

Support:

• Our support team is available 24/7, if you have any questions or need help in installing or configuring digital products purchased on the website, please don’t hesitate to contact form.
• Please note that we are not developers of the provided products, so our technical support capabilities are limited. We do not change product functionality and do not fix developer bugs.

For more information please read FAQs & About Us.

(Only For WHMCS Category Products !)

• We Only provide WHMCS Module, how you can  nulled any module step only !
• Instant access to all plugins and all themes 
• Unlimited domain usage
• Regular Updates as of when available. Usually, updates are released daily.
• Before purchasing, please read the Terms and Conditions & Refund Policy.
• If you have any questions, please first read the FAQs.
• If you haven’t found the answer to your question, please contact us, and we will respond ASAP.
• Please note that any digital products on the website do not contain malicious code, viruses, or advertising. We buy the original files from the developers. We do not sell any products downloaded from other sites.