Building Kiln: A Self-Hosted App Builder That Never Leaves Your Infrastructure

Lovable, v0, Bolt: they all nailed the same loop. You describe an app in chat, an agent writes the code, and a live preview updates while you watch. It feels like magic the first time. Then you try to use it for something real at work and hit the wall: your prompts, your source, and your data all live on someone else’s cloud. For a lot of internal tools that’s a non-starter. The prototype a PM wants to spin up touches customer records. The dashboard someone needs by Friday runs against a production-adjacent database. You can’t paste that into a SaaS build tool and hope for the best. ...

July 9, 2026 · 10 min · 1955 words · Sylvain Cau