Capacity

AI app builder that generates full-stack React + Express + SQLite apps from natural language specs.

Freemium· Free tier; usage-based credits that never expireCodingMulti-model7.1 / 10

Best for

Pick Capacity if you are a non-technical founder who wants a real exportable full-stack codebase from a spec, not just a frontend prototype.

Skip if

Skip it if you need a specific production stack (Next.js, Postgres, serverless) or are an experienced engineer who would rather scaffold by hand.

Capacity is a no-code AI development platform that turns plain-English descriptions into working full-stack web and mobile applications. It pairs an 'AI co-founder' chat that helps clarify your idea with a Spec Mode that forces a planning step before generation, then scaffolds a React/TypeScript frontend (or React Native for mobile), a Tailwind UI, an Express backend, and a SQLite database in one go. You keep the code: it can be exported to GitHub or downloaded directly, and a one-click publish flow handles deployment.

It is aimed at non-technical founders, solo makers, and product people who want a real backend instead of stitching together third-party APIs. The pricing is credit-based with a free tier and credits that never expire, which makes it friendlier for sporadic side-project users than subscription-locked competitors. The stack choices (Express + SQLite) are conservative and easy to host anywhere, which is a meaningful differentiator from builders that lock you into a proprietary runtime.

The trade-off is that the generated stack is fairly opinionated and modest in scope, so teams who need Postgres, serverless, or a specific framework will outgrow it quickly. As a prototyping and MVP tool, though, it sits comfortably alongside Lovable, Bolt, and v0 with a clearer 'spec first, then build' workflow.

Editor's take

Capacity's spec-first workflow and genuine backend generation are a refreshing answer to the 'pretty frontend, no plumbing' problem that plagues most AI app builders. The Express + SQLite default is a sensible MVP choice, though serious teams will eventually need to port off it. A solid pick for idea-stage founders who want to walk away with code they actually own.

— The AI Tool Bible editorial team