At home, machines stay on: a Raspberry for services, sometimes a second one, and a Mac. Without a tool, you notice the incident late: full disk, dead service, a hot Pi.
Harde puts a hub on the Raspberry: it samples the local machine, receives the other nodes, keeps seven days in SQLite, and pushes live over WebSocket. The Mac app connects over the LAN first, then a public URL, with a token in the Keychain.
Machine cards, detail with trends, alerts (offline, CPU, temperature, disk, service, throttle). Same visual language as TwitchDL. Personal use, not on a store.