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Introduction
Capacity.so is an AI-powered full-stack web application builder that transforms ideas into production-ready applications in minutes. Powered by Claude Opus 4.5, the platform introduces Spec Coding, a structured approach to AI-driven development.
What is Capacity.so?
Capacity.so acts as an AI cofounder, collaborating with users to brainstorm, refine, and generate production-grade applications. Unlike basic code generators, it maintains deep project context across files and architectures.
Core Technology Stack
Frontend Architecture
- Framework: Next.js
- Styling: Tailwind CSS
- Language: TypeScript
- UI Components: Pre-built modern components
Backend Architecture
- Database: Supabase PostgreSQL
- Authentication: Built-in user auth
- API: Node.js runtime
- Real-time: WebSocket support
Spec Coding Methodology
| Traditional Coding | Spec Coding |
|---|---|
| No upfront planning | Specification-first approach |
| Frequent rewrites | Predictable iterations |
| Vague AI instructions | Precise AI understanding |
Why Choose Capacity.so?
- 20x faster than traditional development
- 10x cheaper than hiring developers
- Full code ownership
- Zero vendor lock-in
Conclusion
Capacity.so democratizes full-stack application development by combining agentic AI, structured specifications, and enterprise-grade architecture. It is ideal for founders, freelancers, and teams looking to ship faster without sacrificing quality.
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