How do I build an app with Claude?

Connect the Fine Structure connector from Claude's connector directory, then ask in plain words. Claude generates the complete application on your Fine Structure account, publishes it, and replies with a live public link, typically within minutes for a first version.

Claude on its own writes code but has nowhere to run it: no hosting, no database, no domain. A connector closes that gap. With Fine Structure connected, the chat message "Build a CRM for my business with customers, jobs and invoices, publish it and give me the live link" is a complete instruction: Claude calls create_app, waits for the build, publishes, and hands back the URL.

What the connector actually does

Generates a complete application from a prompt: React pages, a managed database, authentication, styling.
Publishes to a live URL on a free subdomain, and connects a custom domain with automatic TLS on paid plans.
Edits existing apps: reads files, patches them, validates, republishes. Every change keeps a restorable saved version.
Creates database schemas and records, queries them back, and reports on them.
Reads traffic analytics and runtime errors for published apps, then fixes what it finds.
Creates standing AI agents that run on a schedule and can message their verified owner on WhatsApp and by email.
82 tools over the OAuth surface and 13 starter prompts, documented at finestructure.ai/api/mcp/docs.

Connecting takes about two minutes

Open claude.ai and sign in. A free Claude account is enough; free accounts can add one custom connector.
Go to Settings, then Connectors, choose Browse connectors, and search for Fine Structure. Click Connect.
Sign in with a Fine Structure account (the free tier is enough, no credit card) and approve.
Back in the chat, ask for what you want built. The result is published at a public link.

In Claude Code: claude mcp add --transport http finestructure https://finestructure.ai/api/mcp, then run /mcp to authenticate. The full guide covers the desktop app and every other client.

Questions people ask

Does this work on a free Claude plan?

Yes. Anthropic documents custom remote MCP connectors on Free, Pro, Max, Team and Enterprise, with free accounts limited to one custom connector. A free Fine Structure account is enough on the other side, and no credit card is required.

Do I need to know how to code?

No. You describe the app in your own words. The generated application is real React with a managed database, and developers can read and patch individual files from the same chat, but nothing requires it.

What happens if Claude changes something I did not want?

Every file change keeps a saved version you can roll back to, most Claude surfaces ask for confirmation before write actions, and the connection is revocable at any moment from the Fine Structure account panel.

Where this is listed

Fine Structure is a Community connector in Anthropic's connector directory (listed, not verified or endorsed), and the same server is recorded in the official MCP registry as ai.finestructure/fine-structure, on Smithery and on Glama. The endpoint answers publicly at /api/mcp/manifest, so any claim on this page can be checked against the live tool list.