# Tilion

> A stealth browser for AI agents. Tilion runs Fortress, an open-source
> recompiled-Chromium engine that corrects the browser fingerprint in C++, and
> drives it through a Python framework and an MCP server. It reaches pages that
> block ordinary automation (Cloudflare, DataDome, 403 walls) by presenting as a
> real Chrome install, with no JavaScript patch layer for a site to detect.

## Pages
- [Fortress](https://fortress.tilion.com): what the engine is, why patching the engine beats patching the page, detector results, comparison with puppeteer-stealth / undetected-chromedriver / Camoufox / nodriver, how to drive it, and the Fortress MCP server (26 tools) for AI agents.
- [Fortress pricing](https://fortress.tilion.com/pricing): free for developers and small companies, company licence for larger teams.
- [Stealth is a speed problem](https://tilion.com/blog/stealth-is-a-speed-problem): why hosted agent browsers trade stealth against latency, why an agent in a loop can afford neither, and the launch of Tilion Cloud (hosted, $0.03 per browser-hour). Includes the stealth benchmark (71 bot-defended sites) and the 10-concurrent speed benchmark.
- [Tilion Cloud](https://tilion.com/blog/tilion-cloud): hosted stealth browsers with residential egress, coming soon.
- [Cloudflare blocks AI agents by default now](https://tilion.com/blog/cloudflare-blocks-agents): a benchmark of what agents actually receive from bot-protected sites (block pages, silently ingested as content) across 8 sites, and how Fortress and Tilion Cloud recover the real data.

## Source
- [Fortress on GitHub](https://github.com/tiliondev/fortress): BSD-3 engine, published patch series, reproducible build.

## Note
Fortress corrects the fingerprint, not the egress IP. A clean fingerprint on a
datacenter IP is still blocked by the hardest targets; it is not "undetectable."