Shelly 1PM Gen4 vs Shelly Plus 1

The Shelly 1PM Gen4 wins overall. It costs less, adds energy monitoring, and supports Zigbee, Matter and Apple HomeKit alongside Alexa, Google Home, SmartThings and Home Assistant. The Shelly Plus 1 answers with a UL-listed build and its longer track record.

Metering and radios. The Shelly 1PM Gen4 reports power, voltage and consumption and can run on Zigbee as well as Wi-Fi, with Matter and HomeKit support. The Shelly Plus 1 has no energy monitoring, no Zigbee, no Matter and no HomeKit. Both need a neutral wire on mains power.

Yes. With a Zigbee hub it joins as a Zigbee device and even repeats the mesh for other devices, which is useful in a Zigbee-heavy home or with Zigbee2MQTT. Switching modes can be fiddly, since it involves firm button presses, but it means one module covers both Wi-Fi and Zigbee setups.

The Shelly 1PM Gen4 on documented protection: it lists overheating, overvoltage, overcurrent and overpower cutoffs, while the Shelly Plus 1 documents overheating protection only, though it has a UL-listed build. Both are rated for 16A AC.

Buy the Shelly 1PM Gen4 if you want the most flexible single-channel relay: 16A switching, accurate energy metering, dry and wet contacts, and a choice of Wi-Fi, Bluetooth, Zigbee or Matter with HomeKit and SmartThings support.

Buy the Shelly Plus 1 if you prefer a proven, UL-listed module with overheating protection, dry contact isolation, support for 16A AC or 10A DC loads, local operation with no cloud account and a 3-year warranty.