CrossUO: A new Ultima Online client for the Web

Latest builds straight from GitHub Releases. No installers, no launchers.

Auto-detected for your platform; open the menu for all options.

Shard owners can host the CrossUO web client directly on their own shard website, freely and at no cost. No gates, no accounts, no middlemen — players just click and play from the browser.

Being fully open source, you decide exactly which features players can use with the integrated assistant, tailoring the client to your shard's ruleset.

Open source means no lock-in and no hidden restrictions. Audit it, fork it, shape it — the client belongs to you, the community.

CrossUO is a ture open source Ultima Online® client reimplementation trying to honor to the original experience without excessive "modernisation". It aims to run on any platform, with a minimal sized single file executable to deliver a client compatible with all eras of the game.