Post-quantum encrypted

Collaboration that
can't be stopped.

Board, Chat, Documents, Canvas, Drive, and Calls — all peer-to-peer, all end-to-end encrypted, all yours. No servers. No cloud. Works even when the internet doesn't.

Peer-to-peer Offline-first Sovereign
Everything you need

A complete platform,
without the platform

Every tool your team needs — messaging, task management, documents, whiteboarding, file sharing, and calls — running peer-to-peer with no servers between you.

Chat

Encrypted messaging with message editing, emoji reactions, @mentions, markdown rendering, typing indicators, and presence status. Real conversations, fully private.

Board

Kanban-style task boards synced across your team in real time. Drag cards between columns, assign work, and track progress — all conflict-free with CRDTs.

Documents

Collaborative documents with real-time CRDT-based editing powered by Yrs. Multiple people editing simultaneously with automatic conflict resolution. No merge conflicts, ever.

Canvas

Shared whiteboard for visual collaboration. Sketch diagrams, map ideas, and brainstorm together — synced across all participants in real time.

Drive

Peer-to-peer file sharing and storage. Transfer files directly between nodes — no cloud middleman, no upload limits, no storage fees.

Calls

Voice and video calls routed peer-to-peer over the encrypted mesh. No call servers, no recording by third parties, no quality compromises.

Privacy by architecture

Not just encrypted.
Structurally private.

There are no servers to subpoena. No cloud to breach. No company holding your data. Communitas is peer-to-peer — your data lives on your devices and nowhere else.

Post-quantum encryption

ML-DSA-87 signatures for user identity (Level 5, 192-bit quantum security). Built to withstand both classical and quantum attacks.

Partition-tolerant

Works when the internet doesn't. Your team keeps collaborating across network partitions — CRDTs reconcile state automatically when connections restore.

No servers. Ever.

Every node is a first-class citizen. No central servers, no cloud accounts, no infrastructure to manage or trust. The network is its participants.

Trust you control

Contacts are categorised: blocked, unknown, known, trusted. You decide who can reach you and what access they get.

Cryptographic stack
IdentityML-DSA-87 (FIPS 204, Level 5)
SigningML-DSA-65 (network layer)
Key exchangeML-KEM-768
SyncYrs CRDT v0.19
Native experience

Beautiful. Fast. Yours.

A native application built for real work. Switch between Board, Chat, Documents, Canvas, Drive, and Calls — all within one encrypted workspace.

Communitas — Saorsa Dev

Board

end-to-end encrypted
To Do 3
feature
Offline file sync for Drive
David
design
Canvas toolbar redesign
Benjamin
feature
Thread replies in Chat
Unassigned
In Progress 2
infra
CRDT partition healing
David
design
Document editor formatting
Benjamin
Done 2
infra
Emoji reactions in Chat
David
feature
@mention notifications
Benjamin
All data encrypted with post-quantum cryptography — ML-DSA-87

Up and running in minutes

No accounts. No sign-ups. No cloud configuration. Install, connect, collaborate.

1

Install the network

Install the x0x daemon — the peer-to-peer gossip layer that Communitas runs on. One command, 30 seconds.

2

Launch Communitas

Open the app. Your cryptographic identity is generated automatically. No email, no password, no phone number required.

3

Start collaborating

Add contacts by their identity, form groups, and use the full platform. Everything is encrypted end-to-end from the first message.

Download

Get Communitas

Board, Chat, Docs, Canvas, Drive, and Calls — all encrypted, all local.

macOS

Communitas for Mac

Universal binary — Apple Silicon and Intel.

Download for macOS
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Windows

Communitas for Windows

Windows 10 and later.

Download for Windows
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Linux

Communitas for Linux

AppImage — works on any distro.

Download for Linux
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Source

Build from source

Open source under AGPL-3.0.

View on GitHub

Communitas runs on the x0x network — a post-quantum encrypted gossip layer for peer-to-peer communication. You'll need the x0x daemon installed to connect.