Show HN: Sandboxd – Self-Hosted app Builder (agents, sandbox, preview url) (github.com)

The newly announced **sandboxd** is an open-source, self-hosted AI app builder that empowers users to create and deploy applications effortlessly. By simply prompting a coding agent, users can have real applications built and running in isolated environments—with each app accessible via its own live preview URL. This tool supports over 80 curated applications, making it perfect for developers seeking a streamlined way to deploy a variety of software without relying on external infrastructure. With a focus on API-driven interactions, sandboxd enhances development efficiency, letting users start from templates, modify existing apps, or create new ones entirely through a conversational interface. Significantly, sandboxd combines features like container isolation, automated runtime management, and a minimalistic architecture, which excludes heavyweight dependencies like Kubernetes. Its capability to spin up isolated containers means applications can be run concurrently with reduced resource overhead, making it ideal for users managing multiple projects. The built-in coding agents—such as OpenCode and Claude Code—ensure that sensitive information is securely handled within the environment. With a straightforward installation process and a commitment to open-source principles under an MIT license, sandboxd is poised to facilitate rapid application development predominantly on users' own servers, fostering a robust AI/ML ecosystem that prioritizes control and flexibility.