Capacity vs Rocket.new
Looking for a Rocket.new alternative?
Discover why spec-first beats one-shot prompting.
Both platforms promise AI-powered app development, but they take fundamentally different approaches. This comprehensive comparison will help you choose the right tool for your projects in 2025.
Capacity uses specifications
vs Rocket's one-shot prompts
No token anxiety with Capacity
vs Rocket's token-based pricing
Code ownership
Export to GitHub anytime
What is Rocket.new?
Rocket.new is an AI-powered no-code platform that turns natural language prompts and Figma designs into functional applications. Launched by an Indian startup that raised $15M from Accel and Salesforce Ventures, it promises to build "full apps from plain text" with backend and integrations in minutes.
Rocket.new Key Features
- One-shot full-stack app generation from prompts
- Figma-to-code conversion (up to 25 screens/month)
- React, Next.js, Flutter, and HTML support
- Supabase, Stripe, and GitHub integrations
- One-click deployment to Netlify or custom domains
Rocket.new Limitations
- No specification-first methodology
- Token-based pricing creates usage anxiety
- One-shot prompting limits precision for complex apps
- No integrated user story or project management
- Complex apps can burn through tokens quickly (3-5M+)
Rocket.new Review: A Detailed Look
Rocket.new has gained significant traction in the AI app builder space, crossing 400,000 users and $4.5M ARR. The platform's headline feature is "one-shot" app generation - describe what you want in a single prompt, and Rocket attempts to build a complete full-stack application with backend, database, and integrations.
The Figma-to-code feature is genuinely useful for designers who want to convert their designs directly into working code. The platform supports multiple frameworks (React, Next.js, Flutter) and includes useful integrations with Supabase, Stripe, and GitHub.
However, the one-shot approach has fundamental limitations. When you describe a complex application in a single prompt, the AI must guess what you mean. This leads to iterations, corrections, and token consumption. Each fix burns more tokens, and complex apps can quickly exhaust your monthly allocation. The token-based pricing ($25-100/month) creates anxiety about usage that spec-first development eliminates.
Why Choose Capacity Over Rocket.new
Capacity takes a fundamentally different approach to AI development that produces better, more maintainable results.
Spec-First Development
Unlike Rocket.new's one-shot prompts, Capacity uses spec coding - a methodology where you define comprehensive specifications before any code is generated.
- Project brief documentation
- User experience specifications
- Design system definitions
- User story management
AI Co-founder
Rocket.new generates code from prompts. Capacity provides a true AI co-founder experience that helps you think through your product holistically.
- Strategic product guidance
- Helps refine specifications
- Understands full project context
- Persistent knowledge across sessions
No Token Anxiety
Rocket.new's token system means every generation and fix costs you. Capacity's credit-based model is more predictable and less stressful.
- Predictable credit-based pricing
- No watching token meters
- Generous free tier to start
- Pay only for what you use
Built for Complexity
One-shot prompting struggles with complex apps. Spec-first development is designed for applications that need careful planning.
- Handles multi-feature applications
- Maintains architectural consistency
- Living documentation stays in sync
- Iterative refinement without restart
How Capacity Works
A step-by-step look at the spec-first development process
Write Your Project Brief
Start by describing your project at a high level. What problem does it solve? Who is it for? What are the core features? Your AI co-founder helps you refine and structure your ideas into a clear, actionable brief. Unlike Rocket.new's single prompt, this creates a foundation for precise development.
Define User Experience
Map out user flows, interactions, and the overall experience you want to create. Define how users will navigate your app, what actions they'll take, and what outcomes they'll achieve. This level of UX specification is simply not possible with Rocket.new's one-shot approach.
Specify Design Requirements
Document your visual preferences, brand guidelines, and design system. Include color palettes, typography, component styles, and layout preferences. AI uses these design specs to generate consistent, beautiful interfaces that match your brand.
Create User Stories
Break down your features into user stories - specific, implementable tasks. Each story becomes a clear instruction for the AI, ensuring nothing gets lost in translation. This structured approach eliminates the guesswork inherent in one-shot prompts.
Generate, Deploy, Iterate
With your specifications complete, AI generates production-ready code. Deploy instantly to your custom domain, connect to GitHub for version control, and iterate by updating your specs - not by fighting with prompts or burning tokens.
Feature-by-Feature Comparison
See how Capacity stacks up against Rocket.new across key features
| Feature | Capacity | Rocket.new |
|---|---|---|
| Spec-First Development | ||
| AI Code Generation | ||
| Project Brief Management | ||
| User Story Tracking | ||
| UX Specifications | ||
| Design System Specs | ||
| Real-time Live Preview | ||
| Supabase Integration | ||
| GitHub Integration | ||
| Code Export | ||
| Custom Domains | ||
| Built-in Hosting | ||
| AI Co-founder/Advisor | ||
| Iterative Spec Updates | ||
| Living Documentation | ||
| Figma Import | ||
| Mobile App Generation (Flutter) | ||
| Free Tier |
What Can You Build with Capacity?
Real-world applications that benefit from spec-first development
SaaS Dashboard
Build a complete SaaS application with user authentication, subscription management, admin dashboard, and analytics. Capacity's spec-first approach ensures all user roles, permissions, and data flows are clearly defined before development.
E-commerce Platform
Create a full-featured online store with product catalog, shopping cart, checkout flow, and order management. Specify your exact product structure, payment flows, and inventory logic upfront for precise implementation.
Internal Tools
Build custom internal tools for your team - CRMs, inventory systems, project trackers, or data dashboards. Define your workflows and data models in specifications for precise implementation.
Client Portals
Create branded client portals with secure login, document sharing, project tracking, and communication features. Spec-first ensures every user interaction is thoughtfully designed.
Pricing Comparison
Predictable pricing vs token-based anxiety
Capacity- Free tier available
- Credit-based flexible pricing
- No token anxiety or limits
- Pay only for what you use
- Hosting included
Rocket.new- Personal: $25/mo - 5M tokens
- Rocket: $50/mo - 10.5M tokens
- Booster: $100/mo - 22M tokens
- Free tier: 1M tokens (one-time)
- Complex apps: 3-5M+ tokens each
The Spec Coding Advantage
Why Capacity's specification-first approach beats Rocket.new's one-shot prompting
Rocket.new's ApproachOne-Shot Prompting
"Build me a task management SaaS with teams"
AI guesses requirements, burns tokens
Output may not match your vision
- Multiple iterations burn more tokens
- AI fills gaps with assumptions
- No structured documentation
Capacity's ApproachSpec-First Development
Detailed specs: Brief + UX + Design + Stories
AI knows exactly what to build
Production-ready code matching your vision
- First output matches requirements
- No guessing - specs are explicit
- Living documentation stays in sync
How to Switch from Rocket.new to Capacity
A step-by-step migration guide for Rocket.new users
Export Your Rocket.new Project
If you have existing code in Rocket.new, export it via GitHub or download. Document your current features and what needs improvement.
Create Your Project Brief in Capacity
Start fresh with Capacity by creating a comprehensive project brief. Describe your product vision, target users, core features, and business goals. The AI co-founder will help you refine this.
Define User Experience Specifications
Map out your user flows, page structure, and interactions. This is where Capacity shines - you're explicitly defining how users will navigate and use your application.
Set Up Design Specifications
Configure your design system including colors, typography, spacing, and component styles. This ensures your new build maintains brand consistency.
Create User Stories
Break down your features into user stories. Each story becomes a clear, implementable task that the AI can execute precisely based on your specifications.
Generate and Deploy
With your specifications complete, let Capacity's AI generate production-ready code. Connect to GitHub, deploy to your custom domain, and you're live.
Who Should Choose Capacity?
Capacity is the better choice if you're building something that matters
Serious Founders
Building an MVP that needs to be production-ready, not just a quick prototype from a single prompt.
Technical Teams
Developers who want AI assistance without sacrificing code quality or architecture decisions.
Complex Projects
Applications requiring careful planning, multiple features, and long-term maintainability.
Enterprise Builders
Teams that need structured documentation and clear specifications for compliance.
Budget-Conscious
Those who want a free tier to start and flexible pay-as-you-go pricing without token anxiety.
Iterative Builders
Builders who want to refine specifications over time without burning through tokens.
Technical Comparison
A deeper look at the technical differences between platforms
Tech Stack
Capacity
- React 18 + Next.js 14
- TypeScript for type safety
- Tailwind CSS for styling
- Supabase (PostgreSQL, Auth, Realtime)
Rocket.new
- React, Next.js, HTML options
- Flutter for mobile apps
- Tailwind CSS for styling
- Supabase integration available
Deployment Options
Capacity
- One-click deploy to Capacity hosting
- GitHub integration for CI/CD
- Export and self-host anywhere
- Custom domains with auto SSL
Rocket.new
- Deploy to Netlify
- GitHub sync available
- Code export/download
- Custom domains supported
Database & Backend
Capacity
- Supabase PostgreSQL (native)
- Row-level security
- Real-time subscriptions
- Edge functions
- Built-in authentication
Rocket.new
- Supabase integration
- Auto-generated schemas
- Authentication setup
- API endpoints
Mobile Support
Capacity
- Fully responsive web apps
- Mobile-first design support
- PWA capabilities
- Native mobile on roadmap
Rocket.new
- Flutter mobile app generation
- iOS and Android support
- Responsive web apps
- iPhone app recently launched
Frequently Asked Questions
Common questions about Capacity vs Rocket.new
What makes Capacity different from Rocket.new?
The fundamental difference is methodology. Rocket.new uses prompt-based generation where you describe what you want in one shot and AI interprets it. Capacity uses spec-first development where you define detailed specifications (project brief, UX, design, user stories) before code generation. This results in more accurate, maintainable code that matches your exact requirements - not just what AI guesses you want.
Is Capacity free to try?
Yes! Capacity offers a free tier so you can experience spec-first development before committing. While Rocket.new also has a free tier with 1M tokens, their token-based model means you're always watching your usage. Capacity's credit-based approach is more predictable and less anxiety-inducing.
Can I migrate from Rocket.new to Capacity?
Absolutely. Since both platforms generate standard code and integrate with GitHub, you can export your Rocket.new project and use it as reference while building properly in Capacity. The time investment in writing specifications pays off with cleaner, more maintainable code.
Which platform is better for complex applications?
Capacity is specifically designed for complex applications. The spec-first methodology ensures that all requirements, user flows, and design decisions are documented before development begins. Rocket.new's one-shot approach works for simple apps but breaks down when you need precise control over complex features.
Does Capacity support databases?
Yes! Capacity has native Supabase integration, giving you a production-ready database with authentication, real-time subscriptions, and storage. Rocket.new also supports Supabase, but Capacity's spec-first approach means your database schema is thoughtfully designed upfront, not generated on the fly.
What about Rocket.new's Figma import feature?
Rocket.new's Figma-to-code feature is useful for converting designs directly. Capacity takes a different approach - instead of importing designs, you define design specifications that guide AI to create consistent, systematic designs. This results in more maintainable design systems rather than one-off conversions.
Does Rocket.new support mobile apps?
Yes, Rocket.new can generate Flutter mobile apps, which Capacity currently doesn't support. If you specifically need native mobile apps, Rocket.new has an advantage. However, Capacity's web apps are fully responsive and work great on mobile browsers, and native mobile support is on the roadmap.
How does the token system compare to credits?
Rocket.new uses tokens that deplete with every generation and fix. Simple landing pages use 1-2M tokens, complex apps 3-5M+. This creates anxiety about usage. Capacity uses a credit-based system that's more predictable - you know what you're spending and when, without worrying about running out mid-project.
Which has better code quality?
Both platforms generate React/Next.js code, but quality differs based on approach. Rocket.new generates code from prompts, which can lead to inconsistencies across multiple generations. Capacity's spec-first approach means the AI has comprehensive context, resulting in more consistent, well-architected code.
Can I use my own domain with Capacity?
Yes, Capacity supports custom domains for all deployed applications. You can connect your own domain and have your app running on your brand's URL. SSL certificates are automatically provisioned and managed. Rocket.new also supports custom domains through their deployment options.
What tech stack does Capacity use?
Capacity generates modern, production-ready code using React 18, Next.js 14, TypeScript, and Tailwind CSS for the frontend. For backend and database, it integrates with Supabase, giving you PostgreSQL, authentication, real-time subscriptions, and edge functions. Rocket.new supports similar stacks plus Flutter for mobile.
Who should use Rocket.new vs Capacity?
Use Rocket.new if: You want quick prototypes from single prompts, need Figma-to-code conversion, or require native mobile apps via Flutter. Use Capacity if: You're building something serious that needs to be maintainable, you want structured specifications, or you prefer thoughtful development over rapid generation.
The Bottom Line: Capacity vs Rocket.new
Both Capacity and Rocket.new are AI-powered app builders, but they serve different needs. Rocket.new is best for users who want quick prototypes from single prompts, need Figma-to-code conversion, or want to build Flutter mobile apps. It's a solid choice for rapid experimentation.
Capacity is the better choice for serious builders who want production-ready applications. The spec-first methodology means you spend time upfront defining exactly what you want, resulting in code that matches your vision the first time. No more endless iterations burning through tokens.
If you're building something that matters - an MVP for investors, a SaaS product, or internal tools for your team - Capacity's structured approach will save you time, money, and frustration. Plus, you can start free without token anxiety.