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This open-source project is run by Masland Tech LLC. Donations keep the crawler online and go to the project bank account through Stripe Checkout.
Matrix is an open standard for interoperable, decentralized, real-time communication. It allows you to chat across different providers (like email) without being locked into a single platform.
Learn more at joinmatrix.org
Active Matrix Rooms crawls the Matrix federation to discover public rooms and measure their real-time activity by counting messages only.
We count messages to calculate activity rates. We do not read, store, or index message content — only the number of messages in a time window.
Every room is periodically checked by counting recent messages and calculating a messages per hour rate. Message text is never read or stored — only the count. This rate is smoothed over time to filter out spikes. Rooms are ranked primarily by this activity rate, with member count as a tie-breaker.
The system automatically crawls known Matrix servers every 5 minutes, viewing their public room directories respectfully. New servers are discovered from room metadata.
Use the Add field in the header to manually add anything the crawler hasn't found yet. You can enter:
#room-name:server.org — a room alias!roomid:server.org or a domain-less room IDserver.org — a server domain (scrapes all its public rooms)matrix.to share link, including via= serversPaste up to 100 rooms, aliases, or servers — one per line.
Find active Matrix rooms by subject — sorted by real-time conversation, not member count. Activity is measured by counting messages only; content is never stored.