unbrowser
Web access for LLM agents. One static binary. No Chrome.
unbrowser is the lightweight open-source browser tier from Unchained: cheap, stateful web access for agents when curl/WebFetch is too dumb and full Chrome is too heavy. When a page needs real Chrome, cookies, extensions, or human-in-the-loop auth, escalate to unchainedsky-cli or Unchained.
Try it hosted: Unchained exposes a public Streamable HTTP MCP endpoint at https://unchainedsky.com/unbrowser-mcp for discovery and smoke tests. Glama also runs a hosted MCP release at glama.ai/mcp/servers/protostatis/unbrowser, and the Smithery page is at smithery.ai/servers/protostatis-dev/unbrowser. These hosted endpoints are shared infrastructure: do not send private cookies, secrets, or authenticated browsing tasks through them. For production workflows, install the local binary below so sessions and cookies stay on your machine.
Install
Python (recommended) — wheel ships the native binary. Requires Python 3.10+:
pipx install pyunbrowser # cleanest on macOS Homebrew / modern Linux (handles PEP 668)
pip install pyunbrowser # in a venv on python3.10+
