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OpenThorn
Open-source AI website builder. Bring your own API key.
OpenThorn is a free, open-source AI website builder. Connect your own API key from a variety of providers — OpenAI, Anthropic, Gemini, Ollama, and more — and an AI agent plans, builds, and verifies a complete website. Everything compiles and previews instantly in your browser, then deploys with one click. No subscription, no markup on tokens, no lock-in: you pay your provider directly and keep full ownership of the code. An open alternative to Lovable, Bolt, and Base44.
Hey Product Hunt! 👋
I built OpenThorn because I loved tools like Lovable and Base44 but didn't love paying a subscription on top of the AI costs already baked into them. So I made the open version: you bring your own API key (currently 17 providers supported, including local models via Ollama), and you only ever pay your provider directly — at cost.
A few things I'm proud of under the hood:
The agent doesn't just generate code — it keeps a plan, runs compile checks, and does interactive smoke tests on your site before calling it done. (It's goal was to make it similar to Claude Code)
The entire preview pipeline runs in your browser via WebAssembly. No server round-trips — edits compile and render instantly.
Fully open source. Self-host it, fork it, or just read how the agent works.
Try it at openthorn.app — you can go from prompt to deployed website in a few minutes.
I'll be here all day — ask me anything about the agent architecture, the BYOK model, or anything else. Honest feedback (especially the critical kind) is exactly what I'm here for. 🙏
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About OpenThorn on Product Hunt
“Open-source AI website builder. Bring your own API key.”
OpenThorn was submitted on Product Hunt and earned 0 upvotes and 1 comments, placing #68 on the daily leaderboard. OpenThorn is a free, open-source AI website builder. Connect your own API key from a variety of providers — OpenAI, Anthropic, Gemini, Ollama, and more — and an AI agent plans, builds, and verifies a complete website. Everything compiles and previews instantly in your browser, then deploys with one click. No subscription, no markup on tokens, no lock-in: you pay your provider directly and keep full ownership of the code. An open alternative to Lovable, Bolt, and Base44.
OpenThorn was featured in Open Source (68.6k followers), Website Builder (9.6k followers), Artificial Intelligence (473.1k followers), GitHub (41.3k followers) and Vercel Day (20 followers) on Product Hunt. Together, these topics include over 146.7k products, making this a competitive space to launch in.
Who hunted OpenThorn?
OpenThorn was hunted by Thomas Tschinkel. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how OpenThorn stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Thomas Tschinkel