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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 manag…
- AI Caption Generator — Generate platform-optimized captions for Instagram, TikTok, LinkedIn, and Twitter/X. Choose tone, content type, and niche. Multiple captions per generation.
- Viral Hook Writer — 5 scroll-stopping opening hooks per topic across 6 styles: Curiosity, Controversy, Value, Story, Question, Bold Claim.
- Hashtag Research — 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.
Everything You Need Out of the Box
Carefully crafted features that ship with this product — no extra setup, no hidden costs.
AI Caption Generator — Generate platform-optimized captions for Instagram, TikTok, LinkedIn, and Twitter/X. Choose tone, content type, and niche. Multiple captions per generation.
Viral Hook Writer — 5 scroll-stopping opening hooks per topic across 6 styles
Curiosity, Controversy, Value, Story, Question, Bold Claim.
Hashtag Research — 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.
Customer Rating
4.9/5 From 64 verified buyersSales
3,604+ Trusted by businesses worldwideSetup Time
< 5 min From download to liveBuilt to Scale & Convert
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 — Generate platform-optimized captions for Instagram, TikTok, LinkedIn, and Twitter/X. Choose tone, content type, and niche. Multiple captions per generation.
- Viral Hook Writer — 5 scroll-stopping opening hooks per topic across 6 styles: Curiosity, Controversy, Value, Story, Question, Bold Claim.
- Hashtag Research — 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
From Purchase to Launch in 4 Simple Steps
Get up and running in minutes — no fluff, no waiting around.
Purchase Securely
Complete checkout via Razorpay-secured payment.
Instant Download
Files are available immediately in your account.
Quick Setup
Follow the included docs — usually under 5 minutes.
Launch & Grow
Customize, deploy, and scale to your audience.
What Buyers Are Saying
Based on 64 verified reviews
"Excellent quality and instant delivery. The documentation is super clear and setup was a breeze. Highly recommend!"
"Perfect for our use case. Saved us weeks of development time. Support team responded within an hour."
"Clean code, easy to customize. Worth every rupee. Looking forward to future updates."
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