Capacity.so is an AI web application builder that adopts a unique spec-first methodology: before generating code, it asks the user to define a complete project brief and precise user stories. This allows its agentic engine to produce clean TypeScript/Next.js/Supabase code aligned with business logic. Unlike other vibe-coding tools, the code is entirely yours: GitHub export or direct download with no vendor lock-in. Plans starting at $25/month for 100 credits, with options up to $299/month for enterprises.
What is Capacity?
The essentials
Capacity.so is an AI-powered full-stack web application builder. Its distinguishing feature is its spec-first methodology: before generating any code, the platform guides you through writing a complete project brief and granular user stories. Its agentic engine then processes these specifications to generate coherent TypeScript code, aligned with your business logic, and immediately deployable.
Key features
Capacity.so generates complete applications in TypeScript with Next.js for the frontend, Supabase for the backend and database, Tailwind CSS for design, and tRPC or REST APIs. Agentic Mode orchestrates the entire application generation in one session. Full code export to GitHub or direct download guarantees complete intellectual property ownership. Higher plans include custom domains, dedicated support, and early access to new features.
Use cases
Capacity.so excels at rapidly scaffolding MVPs (Minimum Viable Products) for startups or freelance projects. Agencies use it to produce client prototypes in record time. Solo developers accelerate the initial phase of their personal or professional projects. Non-technical founders with a clear product vision can delegate the initial code generation while maintaining control over the result.
Advantages
Capacity.so drastically reduces the time to scaffold a complete web application, from several days to a few hours. The quality of generated code, thanks to the spec-first approach, is superior to most vibe-coding tools. No vendor lock-in preserves users’ technical freedom. The credit system lets you pay only for what you use.
Pricing
Capacity.so offers four plans: Starter at $25/month (100 credits), Growth at $69/month (250 credits, popular), Professional at $129/month (500 credits), and Enterprise at $299/month (1,000 credits). Each plan includes full Agentic Mode access. Additional credits can be purchased separately.
Conclusion
Capacity.so is one of the most serious code generation AI tools thanks to its spec-first approach. For developers and founders wanting to scaffold quickly without sacrificing quality, it’s an excellent choice. Total code ownership makes it a trusted platform for professional projects.