01
A full mesh
Every participant connects directly to every other. No re-encoding, no added latency, nothing in the media path — maximum fidelity for small rooms.
Reliability
Built to stay up for days, not minutes.
Peer-to-peer usually means fragile. We went the other way: 4K Chat treats a dropped call as a bug, not a fact of life. Connections repair themselves without asking you to rejoin, and none of it requires a media server we'd have to pay for — or that you'd have to trust.
Direct peer-to-peer: nothing in between
02
STUN-only traversal
Free public STUN servers help peers find each other across NATs. There is no TURN relay, so there is no per-minute media cost and no server that could see your call.
03
Encrypted end to end
Media rides DTLS-SRTP between devices, and where the browser supports encoded transforms, every video frame is sealed with a key only your peers hold.
Self-healing sessions
Unbounded recovery
Recovery never gives up. ICE restarts escalate through wider candidate strategies and keep retrying for as long as the call is open — there is no attempt limit that ends your session.
Media watchdog
A watchdog checks that frames are actually arriving, not just that the connection claims to be up. Silent tracks are re-negotiated automatically before you notice.
Throttle-proof heartbeat
Timers run in a Worker, so a backgrounded tab, a locked phone, or an idle TV can't stall the keepalive loop that holds the session together.
Connection-first design
Adaptive bitrate and SVC degrade gracefully instead of dropping, and reconnection is automatic after a network change.
Room lease renewal
Long-running rooms renew their own lease continuously, so a call can run for days without the signaling record expiring underneath it.
Everything is visible
A live topology indicator, quality dashboard, received-resolution badge, and resilience panel show you exactly what the call is doing — no black box.
Put it under load
Open a room, watch the diagnostics, and pull your network cable.