FluffyChat: Matrix chat in Flutter with real E2EE

Chat apps look simple until encryption and multi-device sync arrive. FluffyChat is a production Matrix client in Flutter — useful if you care about messaging architecture without inventing a protocol.

Architecture beats

• Matrix SDK as the protocol brain (with Rust crypto such as Vodozemac underneath).
• Flutter as the shared shell for mobile and desktop form factors.
• Optional push (FCM etc.) layered on top of sync — not instead of it.

Steal this

1. Keep protocol state out of widgets; expose streams/selectors.
2. Model rooms as first-class domain objects, not screens.
3. Treat device verification UX as a product surface, not a settings footnote.

Pitfalls

E2EE bugs are trust bugs. Do not home-roll crypto. Offline queueing and out-of-order events will break naive setState UIs.

If you need chat, prefer Matrix (or another mature protocol) over a custom socket JSON soup.

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Originally published on FlutterCook. Read the latest version there — that copy is the one kept up to date.