Margelet

Margelet is an experimental desktop chat client in Go + Qt6 with an unusual job description: it's the reference implementation and stress-testing tool for the full SuperSync chat contract.

It exercises everything — realtime messaging over WebSocket with SSE and long-poll fallbacks, channel governance and moderation consoles, key rotation, attachments, reactions, pins, edits, search, multi-account auth — plus a durable outbox with retry/replay and an API conformance checker with diagnostics export. If a protocol edge case exists, Margelet's job is to find it before a customer does.

Comes with dark, light and liquid-glass themes and a command palette, because even a testing tool deserves self-respect.