Capacity

Turn ideas into full‑stack web apps fast.

What is Capacity? Capacity is a credit‑based AI development tool that turns plain‑language ideas into full‑stack web applications, positioning itself as an “AI cofounder” for founders, indie hackers, and product teams. It focuses on specification‑driven development through its Spec Coding workflow, where users define a project brief, UX, and design requirements before the AI generates production‑ready code. The platform produces modern web apps using technologies such as Next. js, React, TypeScript, Tailwind CSS, and Supabase, and supports both quick “vibe coding” experiments and more rigorous production builds. Key Features: Spec Coding methodology: Structured, specification‑first flow (brief, UX, design) so AI generates code that follows clearly defined requirements instead of guessing from vague prompts. AI Cofounder workspace: An AI “cofounder” that helps brainstorm ideas, refine concepts, and translate them into scoped features and coding tasks, keeping product vision and implementation aligned. True agentic coding: Project‑aware AI agents that understand the codebase, support multi‑file refactors with dependency tracking, and automatically fix many errors and bugs across files. Full‑stack generation: Builds database‑backed apps with auth, storage, and real‑time updates on top of Supabase, along with frontend and backend code in a production‑ready stack.