The RelayHold web client runs entirely in your browser and talks to the same relay as the desktop client — same encryption, same device IDs, zero install.
The web client connects over TLS-secured websockets to the relay and negotiates the same encrypted session as the desktop app.
Locked-down machine, borrowed laptop, or a machine you can't install on — open a browser, enter the device ID, and connect.
Websocket traffic routes through connect.relayhold.com — the same rendezvous and relay servers as the desktop client.