Shelly 1 Gen4 vs Shelly 2PM Gen3

The Shelly 1 Gen4 edges this comparison overall, mainly on connectivity: it speaks Wi-Fi, Bluetooth, Zigbee and Matter and can act as a Zigbee router, plus it confirms dry and wet contacts and an overheating cutoff. The Shelly 2PM Gen3 is the better pick when you need two channels or per-channel energy monitoring.

Protocols and channel count. The Shelly 1 Gen4 is a single-channel relay that adds a Zigbee radio to its Wi-Fi, Bluetooth and Matter connectivity, while the Shelly 2PM Gen3 is a two-channel Wi-Fi relay with energy monitoring and a cover mode but no Zigbee.

The Shelly 1 Gen4 supports Zigbee (with a compatible hub) and even works as a Zigbee router, on top of Wi-Fi, Bluetooth and Matter. The Shelly 2PM Gen3 is Wi-Fi and Bluetooth only, with Matter but no Zigbee radio.

The Shelly 2PM Gen3 includes built-in per-channel power metering. The Shelly 1 Gen4 does not confirm energy monitoring; a Shelly PM model is the choice if you want metering on a single circuit.

DIYers who want protocol flexibility on a single circuit, connecting over Wi-Fi or Zigbee with Matter support, plus dry and wet contacts for garage doors, pumps and low-voltage projects. It also acts as a Zigbee repeater to strengthen your mesh.

Buyers who need to control two circuits or a roller shutter, blind or gate from one module and want per-channel energy monitoring over Wi-Fi and Matter. Both relays require a neutral wire, so wiring is not the deciding factor here.