Review of Capacity
Capacity.so is an AI web app builder with a unique spec-first methodology: before generating code, it asks users to define a complete project brief and granular user stories. This enables its agentic engine to produce clean TypeScript/Next.js/Supabase code aligned with business logic. Unlike other vibe-coding tools, you own all the code: GitHub export or direct download with no vendor lock-in. Plans from $25/month for 100 credits, up to $299/month for enterprises.
Capacity: Transformez votre idée en application web full-stack production-ready en quelques minutes.
Best for
- Solo developers wanting to scaffold apps quickly
- Founders launching an MVP without a technical team
- Agencies needing rapid client prototypes
- Freelancers looking to accelerate code production
Not ideal for
- Legacy projects requiring unsupported tech stacks
- Enterprises with very strict code security constraints
- Developers looking only for a code completion assistant
- Non-technical users without web development basics
Pros & cons
- ✅ Spec-first methodology: project brief before code generation
- ✅ Production-ready TypeScript/Next.js/Supabase maintainable code
- ✅ No vendor lock-in: GitHub export or direct code download
- ✅ Complete full-stack architecture (frontend + backend + DB) in one session
- ✅ Full access to Agentic Mode from the Starter plan
- ✅ Dedicated support and early feature access on higher plans
- ⚠️ Variable credit consumption: hard to estimate for complex projects
- ⚠️ Less suited to very specific projects with unusual technical constraints
- ⚠️ Requires a well-written brief for optimal results
- ⚠️ No fully free plan: limited trial before billing
Our verdict
Capacity.so stands out in the crowded vibe-coding landscape with its disciplined spec-first approach. By requiring a project brief and user stories before any generation, it produces TypeScript/Next.js code significantly more maintainable than most competing tools. Full code ownership with no vendor lock-in is a strong competitive advantage for developers and agencies. Plans are accessible: Starter at $25/month, Growth at $69/month, and Professional at $129/month. The main limitation is sometimes unpredictable credit consumption for complex projects. For developers, founders, and agencies looking to quickly scaffold complete production-ready web apps, Capacity.so offers one of the best efficiency-to-cost ratios on the market.
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FAQ
What is Capacity.so's spec-first method?
Before generating code, Capacity.so guides you through writing a complete project brief and granular user stories. This helps the agent produce code better aligned with your business needs.
Can I export my code from Capacity.so?
Yes, you can export the full source code to GitHub or download it directly. There is no vendor lock-in.
What technologies does Capacity.so use?
Capacity.so generates TypeScript applications with Next.js for the frontend, Supabase for the backend/database, Tailwind CSS for design, and tRPC/REST APIs.
What are Capacity.so's pricing plans?
Starter at $25/month (100 credits), Growth at $69/month (250 credits), Professional at $129/month (500 credits), and Enterprise at $299/month (1,000 credits).
Is Capacity.so suitable for non-developers?
Capacity.so is primarily designed for developers and founders with technical knowledge. Basic web development familiarity is recommended to fully leverage the tool.