Puter AI Builder

What does Puter AI Builder do?

The README describes AI Builder as a way to "use AI to build websites and applications without writing any code" and calls it "an open-source alternative to Lovable, Replit, v0, and similar platforms." You describe what you want in plain language, the agent writes the code, and a live preview updates as the project takes shape. Chat or click into the preview to tell the AI exactly what to change on a selected element.

The project is built on Puter.js, which provides authentication, storage, databases, AI, networking, realtime capabilities and serverless functions without extra setup. The README lists version history so you can restore an earlier state, templates to start from a finished app, and MCP connections so the AI can use tools from other services while it builds. Finished projects can be published to a public URL.

Key facts

• Licence: Apache License 2.0 on the whole repository, including sub-projects, modules and components. Bundled third-party libraries and fonts keep their own licences.
• The README calls it an open-source alternative to Lovable, Replit and v0.
• Backend layer: Puter.js, which provides authentication, storage, database, serverless functions, hosting and realtime capabilities. Puter itself is open source under AGPL-3.0 at github.com/HeyPuter/puter.
• Features in the README: chat and visual editing, live preview, version history, MCP connections, templates, publishing to a public URL.
• Install: git clone, npm install, npm run dev from the repository.
• Live demo: builder.puter.com, operated by HeyPuter.
• Maintainer: HeyPuter, which also runs Puter.com.

What does it replace, and where does it fall short?

Puter AI Builder replaces Lovable, v0 and Bolt for a team that wants the prompt-to-app loop in the browser, under Apache-2.0, with the Puter stack for the backend. It appears on the open-source alternatives to Lovable, v0 and Bolt pages.

Where it falls short: the apps you build depend on Puter.js for their backend. Running fully off Puter needs a Puter self-hosted install, which is a separate project with its own operations work. The README does not state which AI models the builder calls, how keys are supplied for a self-hosted copy, or any Core Web Vitals or performance figures. Lovable, v0 and Bolt have their own hosted CDN, team features and support.

How does Puter AI Builder run?

Two paths from the README. Hosted: open builder.puter.com in a browser and use the live demo. Self-hosted: clone the repository, run npm install, then npm run dev, which starts the builder locally. The runtime does not call out any system requirement beyond Node.js and npm.

Published projects go to a public URL on the Puter network. For a fully self-hosted stack, the Puter backend (github.com/HeyPuter/puter) is a separate install under AGPL-3.0.

Who is Puter AI Builder for?

A builder who wants a browser-based prompt-to-app loop with auth, storage, database and hosting ready out of the box, and is comfortable sitting on top of the Puter stack. For a hosted product with its own team features and support, Lovable, v0 or Bolt is the paid tool. For a self-hosted builder that uses PocketBase instead of Puter, see Tinykit.

What limits does the README state?

None stated in the README. The README does not list browser compatibility, model requirements, hardware floors or scaling notes.

Questions people ask

Is Puter AI Builder open source?

Yes. The LICENSE at the repository root is Apache License 2.0, an OSI-approved licence, and the README says the whole repository and its sub-projects, modules and components are under Apache-2.0 unless explicitly stated otherwise. Bundled third-party libraries and fonts keep their own licences, listed in THIRD_PARTY_NOTICES.md.

Can I use Puter AI Builder commercially?

Apache-2.0 allows commercial use, modification and distribution. You can fork the builder and run it on your own servers. The README invites you to "fork it, customize it, and make it your own." The Puter backend layer is AGPL-3.0, which has a copyleft requirement for network use of a modified version; the builder repository itself is Apache-2.0.

How does Puter AI Builder compare with Lovable?

Lovable is a hosted product that writes the code, runs the database and hosts the app for you under a subscription. Puter AI Builder works in the browser against the Puter stack and can be self-hosted. The code it generates lives in your Puter account, and version history lets you roll back. The open-source alternatives to Lovable page compares it with Dyad, Onlook, Chef, Tinykit and Llama Coder.

What is Puter.js?

Puter.js is HeyPuter's "Internet OS" layer. The README says it provides authentication, storage, databases, AI, networking, realtime capabilities and serverless functions in one SDK, so an app built in AI Builder does not need separate backend infrastructure or API keys. See developer.puter.com for the API reference.

Can AI Builder use MCP tools?

Yes. The README lists "MCP connections: Connect remote MCP servers so the AI can use tools from your other services while it builds." That lets the agent reach APIs or services you expose through MCP, with the policy and auth left to the MCP server.

Sources

• Puter AI Builder README and LICENSE: github.com/HeyPuter/builder, read 2026-11-02.
• Puter.js documentation: developer.puter.com, referenced by the README, 2026-11-02.
• Puter backend repository: github.com/HeyPuter/puter, referenced by the README, 2026-11-02.