Your serveractually yours.

Voice, chat and streams, like Discord.

Download Atrium for macOSWindows Set up the server from the app·or by command

1 linkand a friend is in

5 minutesand your server is up

120 MBof memory for everything

100%of your chats stay with you

Live sound

Sound that keeps up.

Calls run straight through your server, and Anti-lag steps in on a weak connection.

Invite only

Friends join by link.

Open the link, sign up, and you’re in. Strangers can’t get in.

For games

Voices in, keyboards out.

A neural net mutes keyboards and fans. Push to talk works right from the game.

Like Discord

Who’s where, at a glance.

Rooms show who’s inside, and joining takes one click.

Familiar, and all yours.

Servers, channels and chat right where you expect them.

Everything else

The rest,
without the tour.

Channels, direct messages, groups. Text and voice in one window, laid out like Discord.
Camera and screen. Share a game or your desktop with friends. Video is never cropped.
Push to talk. Any key or mouse button, even with the window minimized.
Noise suppression. Off, standard or strong: strong mutes keyboards and street noise.
Mentions and replies. Every mention and reply lands in Notifications.
Reactions and files. Emoji under a message, files by drag and drop.
History search. Find that one link a friend dropped.
Runs in the background. Closing the window doesn’t end the call.
Updates itself. A new version installs on restart.
Nightly backups. A copy of messages and files once a day, kept for two weeks.
Anti-lag. Calls go through the server, with fewer dropouts on weak networks. The server owner can turn it on for everyone.
Lightweight. The cheapest server is enough.

Everything stays
on your ownserver.

Messages, files and calls go through your server, not a third-party service. Invite only, no strangers.
No email, phone number or ID: just a nickname, a password and an invite.

How security works →

Install

It all starts
with the app.

No subscriptions: you only pay for the server.

Download the app

Download for macOSDownload for Windows Windows and Intel Mac →macOS and Intel Mac →

Set up the server in the app

or by command →

Questions and answers.

How stable are calls?

Calls run through your server, with no third-party services in the middle. When the connection is poor, Anti-lag helps: Atrium suggests turning it on, and turns it on by itself on first launch if a direct call can’t connect.

Is it like Discord?

Same layout and habits: servers on the left, channels and voice rooms next to them, direct messages, reactions, files, camera and screen sharing. The difference: the server is yours, and people join by invite only.

How is it different from TeamSpeak?

Think TeamSpeak and Discord combined: your own server, like TeamSpeak, with Discord’s familiar interface for chat, direct messages, camera and screen sharing. People join with an invite link, so there’s no address or password to hand out.

Who sees calls and messages?

Calls and messages go through your server, not a third-party service. Messages and files are stored on that server. Whoever runs the server has access to that data, so it should be someone everyone trusts.

Who can join the server?

Only with a personal invite link. By default one link lets five people sign up, and each one is added to the inviter’s friends right away.

What do I need to run a server?

One low-cost server (VPS) on Ubuntu or Debian with 1 GB of memory or more. A domain is optional: the app can set up a free one. The setup wizard asks for what it needs and does the rest.

Is there a phone app?

Not a separate one. On a phone, Atrium runs in the browser with a mobile layout and can be added to the home screen. Desktop apps are available for Mac and Windows.

Can the domain stay on Cloudflare?

Yes, as long as the records are DNS only (grey cloud): calls can’t go through the Cloudflare proxy. The installer shows which records to add.

All your people, one server.

Download Atrium for macOSWindows Or set up the server by command