Is Builder open source?

Yes. Builder is open source under the Apache-2.0 licence. Its source code is on GitHub at HeyPuter/builder and is written mainly in JavaScript.

Yes. Builder is open source, so the software itself is free to use.

Can I self-host Builder?

Yes. Builder can be self-hosted on your own server or infrastructure.

Builder is an open-source alternative to Replit and Lovable. Other open-source alternatives to Replit include Magic Cloud, Sandboxd and Onlook.

Yes. The most recent commit to Builder was on 5 October 2026. The project has 225 stars on GitHub.

📦✨ AI Builder For Creating Sites and Apps! An open-source alternative to Lovable, Replit,

Built with: JavaScript tools
Tags: ai-agents; ai-builder; base44; bolt; claude-code; codex; lovable; opencode; replit; v0; app-builder

What is Builder?: Builder is a 📦✨ AI Builder For Creating Sites and Apps! An open-source alternative to Lovable, Replit,.
Is Builder open source?: Yes. Builder is open source under the Apache-2.0 licence. Its source code is on GitHub at HeyPuter/builder and is written mainly in JavaScript.
Is Builder free?: Yes. Builder is open source, so the software itself is free to use.
Can I self-host Builder?: Yes. Builder can be self-hosted on your own server or infrastructure.
What is Builder an alternative to?: Builder is an open-source alternative to Replit and Lovable. Other open-source alternatives to Replit include Magic Cloud, Sandboxd and Onlook.
Is Builder actively maintained?: Yes. The most recent commit to Builder was on 5 October 2026. The project has 225 stars on GitHub.