Quick start: from sign up to a working app

Sign up free, describe your app in plain words, and publish. Developers and AI agents connect with a self-serve token.

Fine Structure is self-serve from the first minute. You do not need a sales call or a credit card to start. The free tier includes daily AI generations, so you can build and test a real app before deciding to upgrade.

Build your first app

• Sign up free at finestructure.ai.
• Describe the app you want in plain language, in any language.
• Watch the Studio generate pages, data models, and flows, then click through the live preview.
• Ask for changes in the chat until it feels right.
• Publish with one click, on a shared link or your own domain.

For developers and AI agents

• Create a scoped API token at finestructure.ai/api-keys. Tokens are limited by account, app, and permissions.
• Connect over MCP at https://finestructure.ai/api/mcp (Streamable HTTP, Bearer token), or over REST using the OpenAPI spec at https://finestructure.ai/openapi.json.
• Every MCP tool is also a REST operation at POST /api/mcp/tools/{tool_name}.
• Use the CLI: npx @finestructure/agent to wire the MCP server into Claude Code, Cursor, Codex, and other agents.
• A sandbox environment is available at finestructure.ai/sandbox for safe experiments.

curl -X POST https://finestructure.ai/api/mcp/tools/get_platform_guide \
  -H "Authorization: Bearer fse2_mcp_YOUR_TOKEN" \
  -H "Content-Type: application/json" \
  -d "{}"

Recommended first calls: On a new connection, call get_platform_guide first, then get_recommended_workflow with your task type and goal. They orient the agent and name the exact tools to use next.