What is Previewhost?

Previewhost is an open-source tool that runs isolated local preview environments for full-stack applications.

When you work with multiple Git worktrees or coding agents, managing ports, databases, and environment variables quickly becomes painful. Previewhost solves this by giving each task its own environment with a stable local URL.

Key capabilities

• Start frontend, backend, databases and Redis together
• Native MCP support for coding agents
• Isolated data and ports per preview
• Dashboard, CLI and Node.js library

It runs entirely on your machine and is free under the MIT license.