Shelly 1PM Gen4 vs Shelly Plus 1

The Shelly 1PM Gen4 wins overall. It costs less, adds energy monitoring, works without a neutral wire, and supports Zigbee, Matter and Apple HomeKit alongside Alexa, Google Home, SmartThings and Home Assistant. The Shelly Plus 1 wins on documented safety protection 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, and it also requires a neutral wire.

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 Plus 1 documents overheating protection and a UL-listed build, while the Shelly 1PM Gen4 lists no protections in its specifications. Both are rated for 16A AC, so for a demanding circuit the Plus 1's documented protection, or a PM model with the full protection set, is the more conservative choice.

Buy the Shelly 1PM Gen4 if you want the most flexible single-channel relay: 16A switching with no neutral required, 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 have a neutral wire and 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.