I recently shipped Casto, an AI content repurposing agent powered by Vercel’s AI SDK & AI Gateway
Template : https://v0.link/GNI3Yhn
The problem it solves:
Content creators spend hours adapting their content for different platforms. Each platform has unique requirements - character limits, tone, formatting, audience expectations.
The solution:
Casto takes your blog content and automatically generates platform-optimized versions for X, LinkedIn, newsletters, and Reddit.
But here’s what makes it different from other AI tools:
It’s not just a prompt wrapper. It runs a genuine 4-step agentic workflow:
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ANALYZE - Understands your content’s intent, tone, and target audience
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WRITE - Generates platform-specific content following best practices
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EVALUATE - Automatically checks quality and identifies improvements
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REFINE - Polishes the content based on evaluation feedback
You can watch the AI “think” in real-time through the chain-of-thought visualization.
Tech Stack:
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Built entirely with v0 by Vercel
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Vercel AI SDK for the agentic pipeline
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Supabase for authentication and database
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Next.js 15 with App Router
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X API integration for engagement tracking
The entire project - from UI to backend to database - was built in v0’s canvas environment.
Clean base, easy to extend, meant for experimenting with agent-first flows. Use it as-is or build on top of it.