Shelly 1 Gen4 vs Shelly 1PM Gen4

The Shelly 1 Gen4 edges it overall as the more affordable relay with the fuller listed safety picture. The Shelly 1PM Gen4 is the better buy specifically when you want built-in energy monitoring, and it carries the higher owner rating.

Energy monitoring. The 1PM Gen4 measures instant power, voltage and total consumption, while the plain 1 Gen4 does not. Both share Wi-Fi, Bluetooth, Zigbee and Matter connectivity, dry contacts and a 16A rating.

Only the Shelly 1PM Gen4. Its power metering lets you track an appliance's consumption while controlling it. The Shelly 1 Gen4 has no energy monitoring, so pick the 1PM if consumption data matters to you.

Yes. Both the Shelly 1 Gen4 and Shelly 1PM Gen4 offer Wi-Fi, Bluetooth, Zigbee and Matter, act as a Zigbee router, and work with Alexa, Google Home, Apple HomeKit, SmartThings and Home Assistant. The 1PM simply adds metering.

Buy the Shelly 1 Gen4 if you want the cheaper single-channel relay with the same multi-protocol connectivity and 16A rating and do not need to measure power. Its confirmed overheating protection is a small added reassurance.

Buy the Shelly 1PM Gen4 if you want to both control and measure a circuit, such as a water heater or boiler, and value the built-in power metering along with the higher owner rating.