Attorney Online

Attorney Online, abbreviated AO, is a roleplaying chatroom based primarily in the Ace Attorney universe. Sporting hundreds of player-made characters, court cases and abstract roleplays, AO has been a tight-knit community for well over 5 years.

We are always welcoming new additions to our community. If you'd like to learn more, please check out our Discord server.


Attorney Online launcher screenshot
Want to install AO and let another program handle the updating?
Look below for our launcher.

Confused on how to install the game? Try the launcher!

How to use:
  1. Download the launcher.
  2. Save the launcher in any folder you want.
  3. Run the launcher and click "Download." That's it!

If you're a server owner, you can leverage the launcher to deploy custom assets for your player base. Documentation coming soon.


New to AO? Don’t have an existing installation of AO?
This is for you.
Running Mac?

Use Wine. Wine lets you play Windows games natively without Boot Camp. Be sure you have the latest version of Wine, or try webAO!

Running Linux?

Linux releases currently only support 64-bit operating systems. If you are using a 32-bit version of Linux, try Wine.

Running Windows XP?

You can download a special client for your potato computer which is compatible with Windows XP machines. NOTE: This is not made by the official AO team.
Consult "Headshot" on the official Discord if you need help regarding this client.
(This client will also download the vanilla content for you!)
Download Windows XP client


We are not to be confused with the similarly named Ace Attorney Online. Whereas AAO only offers pre-scripted cases, AO boasts the ability to do live, off-the-cuff cases in a courtroom drama environment.

Excellent question! To start, you will want to find either a pre-written case or a case template to create your own case. Next, find players to fill in each position (prosecution, defense, co-defense, judge, witnesses, etc.). Once you have gathered the required players and found a vacant courtroom, you can begin your case!

Still finding it confusing? There are various communities in AO that organize cases regularly; you need only find and watch (or even join) a case to get an idea of how the game works.

Cases can last around 5 to 6 hours.

Each server may have their own unique content pack that they use. If you look in the server description in the lobby, you can find a link to their downloads to get the pack.
This is a known issue with Microsoft Edge: you may be attempting to run the game from the browser cache. You must extract the archive to a folder of your choosing, such as your desktop.
Add an exception to your antivirus. False positives are very common on small software like ours, as most antivirus software these days use a reputation-based system.
Check your firewall, or try the newest version of AO.

Useful Links