# Buildy. Software that’s finally yours.

Your agent builds an app you can keep using and updating. It stays live at its own URL after the chat ends.

The landing page opens on this happening: a chat where the user types "build me a habit tracker with streaks" and their agent answers with a live Habit Tracker app at app.buildy.so/yourname/streak, already showing a 6-day streak and three habits done today, each with a 7-day history.

Tell your favorite AI what you want, and Buildy publishes it to a real URL with its own data store, APIs, and MCP. Your AI can use it and update it, long after the chat is closed. Works across ChatGPT, Claude, Cursor, Codex, OpenClaw, and more.

This page is the markdown twin of <https://buildy.so/> for agents that asked for `Accept: text/markdown`. The HTML rendering of the landing page advertises this twin via `<link rel="alternate" type="text/markdown" href="/index.md">` and an HTTP `Link: <https://buildy.so/index.md>; rel="alternate"; type="text/markdown"` header.

## A real app you and your agent keep updated

Add to it from your phone, or just tell your agent. It's the same app either way.

The page shows one live Run Log app updated from both places: on a phone, a new entry ("Today, 3.2 mi, 31:08") sits above the past week's runs; in a chat, the user tells their agent "log today's run, 3.2 miles" and the agent saves the identical entry. One app, updated from either place, always current.

## Built by the agent that already knows you

Your agent already knows what you're working on, so the app arrives with your details filled in.

The page makes it concrete: a user asks "What app should I build?" and their agent, recalling context from past conversations (a kitchen remodel, a contractor estimate, a bank balance), proposes and builds a home renovation budget tool showing the $24,800 kitchen remodel budget, the $18,650 contractor estimate, and $6,150 remaining.

## Share it with anyone

Invite anyone by email as a viewer or editor. They can use their own agent or open the app in a browser.

The page shows one shared Trip Planner used by three people, each their own way: you edit it through Claude, Sam views it directly in a browser, and Dana edits it through ChatGPT. You choose who can view and who can edit.

## Other AI apps come with strings attached.

Claude Artifacts are tied to Claude. Codex Sites hosting is limited to Business and Enterprise plans. Buildy apps work with any AI, are available on every plan, live at their own URL, and are yours to keep and share. It's the personal apps platform.

## Publish

Host your app on Buildy so you can use it anywhere. You (or your agent) describe an app inside a chat or a code editor; Buildy stores the app as an ES module plus optional UI and CSS, hosts it at a public URL with key-value storage, and exposes a backend reachable from the UI. The same app shows up in three surfaces:

- A real browser URL you can open, pin, and share.
- An installable PWA on mobile via "Add to Home Screen".
- Inline inside MCP Apps-capable AI clients (Claude Desktop, ChatGPT, Goose, MCPJam) that talk to the Buildy MCP server. Codex uses the same Buildy tools and opens the app URL in its browser fallback.

One datastore: every surface reads and writes the same KV store, via `query_app` / `mutate_app` over MCP or `POST /app/<id>/api/<op>` over HTTP.

## Open one someone already built

Real apps already built and marked remixable; opening one gives you your own editable copy. The page shows each one as a full dashboard screenshot with the app's own colored header.

- **Hydration:** Track water against a daily goal with a progress ring, streak, and seven-day heatgraph. <https://app.buildy.so/app/9daeb91b-4be0-4270-9a44-811d7b1ae0c5>
- **Meals:** Log meals and macros while your agent fills in calories from chat. <https://app.buildy.so/app/11083607-f814-4dfa-9d1f-809a5231b0f5>
- **Flashcards:** Make spaced-repetition decks your agent can fill in bulk, then let the app schedule each review. <https://app.buildy.so/app/ba8ea453-504c-4666-9f71-d92f7e73cda4>
- **Watchlist:** Keep track of what you've seen, what you want to see, and your ratings. <https://app.buildy.so/app/938f304a-5c38-493c-8a1c-0f0c3a74db65>
- **Split:** Let your agent read the receipt, assign each item, and settle the bill. <https://app.buildy.so/app/f879464c-3556-4e9c-9c83-47096dbf9432>
- **Lift:** Log lifts, sets, reps, and weekly volume. <https://app.buildy.so/app/e8b6b9ac-b3f7-441d-ab13-f39c71e7fed8>

## Free for Personal Apps

Build and use your own apps for free. We don't sell your data or train AI on it. We only use it to improve the service.

Working with a team? Buildy for Work keeps every app your team builds in one place, under your control: single sign-on, roles and permissions on every app, an admin view of everything your team builds, and white-label on your own domain. Learn more at <https://buildy.so/work>.

## Three ways to start

1.  **Connect to ChatGPT** via the official Apps directory listing: <https://chatgpt.com/apps/buildy/asdk_app_69f9215e800881919f3d96d79200a35a>. No Developer mode needed; click Connect, then ask ChatGPT to build you an app.
2.  **Open one of the starter apps above** and ask your AI to personalize it. Each is marked remixable, so opening makes a copy you own and can edit.
3.  **Copy the build prompt** into Claude, Cursor, Claude Code, Codex, Cline, Windsurf, Continue, Zed, Gemini CLI, or any other agent with a web/fetch tool:

        Read https://buildy.so/start.md then help me create my first app.

    `start.md` routes the agent by surface (MCP tools vs HTTP API), walks the build flow, and links the focused starter guides.

## What you get

- **Real URLs.** Open, pin, share.
- **Saved data.** Still there tomorrow.
- **AI-ready.** AI can read and update it.
- **Yours to keep.** Every chat, every agent.

Free for the first app; no signup until you decide to keep it.

## For agents that want the build manual

If you are an agent reading this twin and want the full build path, prefer:

- <https://buildy.so/start.md> is the entry point. It routes you by surface (MCP tools or HTTP API) and walks through the build.
- <https://buildy.so/llms.txt> is the agent-facing site map.
- <https://buildy.so/llms-full.txt> is the full build manual, including module shape, capabilities, the HTTP API, the device-code pairing flow, and worked examples.
- <https://buildy.so/docs.md> is the markdown twin of the human docs page.
- <https://app.buildy.so/.well-known/openapi.json> is the machine-readable OpenAPI 3.1 contract.

## See also

- <https://buildy.so/docs> is the human-facing docs page (HTML).
- <https://buildy.so/privacy> is the privacy notice.
- <https://buildy.so/terms> contains the terms of use.
- Email support@buildy.so with questions, bug reports, or partnership inquiries.