agency for superhuman computing

Build Beyond Browsers

Xenon is a framework to build secure and powerful applications with browser-like capabilities based on web standards and backed by the Chrome-based browser you already have.

Background screenshot Xenon with Darc browser UI screenshot

What to build with Xenon?

Build agentic, experimental, niche or fully personal browser experiences without sacrificing performance or security — and without rebuilding everything from scratch.

Built for the age of the agentic web

Build Faster

Skip the grindwork and just write the code that matters.

Secure by Default

Rely on a central sandboxing and permission system with proper defaults and granular control from day one.

Build with web technologies

Build as close to web standards as possible instead of fiddling with C++ or Node.js APIs. (While Chromium only for now, we are working on Electron and Firefox compatibility)

Build on Darc or pick just the parts you need

Darc is a full-featured reference browser that has everything you expect from state-of-the-art agentic browsers

Key Features:

  • Efficient tab management with hibernation, history, data-containers, session management, spaces, tab groups and more
  • Advanced central permission system with granular control
  • Automation Layer and Agent Sidebar built from the ground up for lowest latency experiences, not on top of slow and resource-hungry test frameworks
  • Support for different view modes like tabs, canvas or tile view
Learn about Darc
Xenon running on Windows

Learn more

See what makes Xenon special

Performance and Resource Utilisation

Reusing an already installed browser engine avoids redownloading and installing hundreds of megabytes for every project.

Configurable resource limits and smart tab hibernation allow running thousands of virtual tabs without performance and resource hits.

APIs are a thin layer on top of the established and optimized infrastructure driving Chrome today.

We do not rely on outdated and inefficient automation libraries made for testing. Instead, automation features are enabled surgically only where needed and using the lowest impact layer.

"Xenon allowed me to write the browser I always wanted in a few months, not years, a fraction of code that would have been needed otherwise and without the security and resource impact that solutions like Electron would have brought. It is fair to say that no other solution would have allowed Darc to be built."

Jan Johannes

about rewriting the conceptual browser Darc from a Firefox fork to Xenon (and in the process joining the core team)

Ready to Build with Xenon?

Xenon is in early stages and will mature as infrastructure and learnings are factored from Darc into the SDK. If you have a use case, ping us on Discord. We are happy to help you navigate the rough edges and understand the limitations and things already working great.

Xenon

Build the browsers that work for you.

© 2025 Agent54 - XE, built with ❤️ in Thailand and around the world.

Contact: hello@xe.dev