Capacity

Capacity is an AI app builder for full-stack web and mobile apps from plain-English prompts or specs, with spec-first workflow, code export, and credit billing.

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Overview

Capacity is an AI-powered platform for building full-stack web and mobile applications from a written idea or specification. It is positioned for people who want to refine a concept, plan the work, and generate production-ready code without coding experience.

The product combines natural-language app building with a specification-first workflow. Users can start with a plain-English description, work through project brief and UX planning steps, and then generate code that the site says includes React, TypeScript, Tailwind CSS, an Express backend, and SQLite for full-stack apps.

Features

Build from natural language

Describe an app in plain English and Capacity turns that request into a working web or mobile application.

Specification-first workflow

Use the product to refine an idea step by step before code generation, which helps when the requirements are still unclear.

Full-stack code generation

Generate production-ready stacks for web and mobile, including React, TypeScript, Tailwind CSS, React Native, Express, and SQLite.

Context-aware AI partner

Work with a separate AI Co-Founder that knows the project context and helps with brainstorming, planning, and guidance.

Vibe and Spec modes

Choose between quick build mode and spec mode, where the product first helps you plan with detailed specifications.

Direct publishing and deployment

Publish the finished app directly, with the site stating you can go live in one click and deploy to Vercel or AWS.

Use Cases

Planning a new product from scratch
Refine an early-stage concept into a project brief, define user experience and design requirements, and then generate an initial build from those specs.
Building a prototype from a plain-English prompt
Move quickly from a simple prompt to a working prototype when you already know what you want and do not need detailed specification work first.
Getting unstuck during development
Use the AI Co-Founder to ask follow-up questions, get guidance on Capacity features, and keep momentum when you are blocked on next steps.
Creating full-stack apps with one workflow
Build web and mobile apps with a generated codebase that includes the backend and database rather than piecing together separate tools.
Releasing a finished app
Publish an app once it is ready, using the product’s one-click go-live flow and supported deployment targets.

Pros and Cons

Pros

Supports both quick building and a specification-first workflow.
Covers web and mobile app generation from the same product.
States that full-stack apps include a real backend and database.
Lets users export their code and keep ownership of it.
Offers guided help through an AI Co-Founder that knows project context.

Cons

The site does not provide a full published list of integrations beyond examples and mentions of deployment targets.
Some workflow details are presented at a high level, so readers may need to try the product to understand the exact editing and regeneration experience.

FAQ

What is Capacity?

Capacity is an AI-powered platform for building full-stack web and mobile applications through natural conversation. It helps users refine an idea, plan the work, and generate production-ready code without coding experience.

Do I need coding experience to use Capacity?

No. The site says Capacity is designed for people without coding skills, and you can describe what you want in plain English while the AI handles the technical work.

What technologies does Capacity use?

Capacity generates production-ready applications with React, TypeScript, and Tailwind CSS for web, and React Native for mobile. The source also says each full-stack app gets an Express backend and SQLite database.

Can I export the code I create?

Yes. The source says you own 100% of the code and can export to GitHub or download it directly anytime.

How does pricing work?

Capacity uses credit-based billing. Credits are consumed based on usage, and the pricing page says credits never expire.