Most uptime monitors run in a datacentre. Fine for a public website, useless for the NAS in your cupboard. Ping Bee checks from your phone instead, so anything your phone can reach it can watch: a NAS, Home Assistant, a Pi, a printer, a router page on a LAN address. Nothing exposed to the internet, no port forwarding, no agent to install. Public sites go in the same list. No account, no server, nothing leaves the device. Free for 5 monitors. Pro is one payment, never a subscription.