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.


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 (≥2.0.3)!

Running Linux?

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

Windows SHA-128: 7fda34ffd2ff68e38dd674d8cc53dc57b1bc711c

Linux SHA-256: 593d6556cba52691d8c04d14e9e9d4b8524c150c5bc7b819cc06808f439d1f04


Already have an existing install, and looking to update clients? Look here.


2.6.0 (update only)


2.6.0 (coming soon!)

When prompted, overwrite all the ini files stored within the themes/default folder.

Windows SHA-128 (2.6.0): 8000de943256847319a8fcdd005b120bf1e26656

Windows SHA-256 (2.4.10): 4290b3439b2852db6715991c29377efd521f37f2fa37b02de9b7eb3f2001888e

Linux SHA-256: 84ce1a99bd0ca6a795f1b24c0b5307ddb31f9eb256babf3fc332d145783bdfa0


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