Lovable's open-source rival speaks Chinese, ships Docker

What it does UPage is a browser-based visual editor that generates responsive web pages from natural language prompts, using whatever LLM you plug in via OpenAI-compatible APIs. It spits out clean HTML/CSS/JS you can export, supports multi-page site generation, and runs in a single Docker container on localhost:3000.

The interesting bit The project is explicitly positioned as a “Lovable open-source alternative” — but the real wrinkle is its license. It’s GPLv3 with extra handcuffs: you cannot remove or modify the UPage logo or copyright, and derivatives must stay GPL. Fit2Cloud wants you to call support@fit2cloud.com for commercial use. The code structure borrows from bolt.diy, which the README credits openly.

Key highlights

• Self-hostable via one Docker command; also packaged for 1Panel
• Supports vision models as a “sidecar” when your default LLM can’t read images — uploaded images get persisted to disk to avoid re-transmitting base64
• Real-time WYSIWYG editor with responsive preview
• Multi-page generation for full site structures, not just landing pages
• Standard code export for integration or further hacking

Caveats

• Documentation and UI are Chinese-first; English support is unclear
• License restrictions on branding are unusual for GPL software and may complicate white-labeling
• 516 stars and early-stage; production stability not established

Verdict Worth a spin if you want a self-hosted AI page builder and don’t mind the branding leash. Skip if you need to rebrand it as your own product without negotiating with Fit2Cloud.