Shelly 1 Gen4 vs Shelly Plus 2PM

The Shelly Plus 2PM is better overall as the cheaper, higher-rated relay with two channels, per-channel energy monitoring, a full protection suite and cover mode. The Shelly 1 Gen4 wins if you specifically want Zigbee, Matter, Apple HomeKit or a higher single-channel load rating.

Channels versus connectivity. The Plus 2PM controls two circuits, meters each channel and drives roller shutters, but works over Wi-Fi and Bluetooth only. The 1 Gen4 is single-channel yet adds Zigbee, Matter, a Zigbee router role and Apple HomeKit.

Yes. The Shelly 1 Gen4 adds Zigbee (acting as a Zigbee router), Matter and Apple HomeKit, none of which the Shelly Plus 2PM supports. The Plus 2PM connects over Wi-Fi and Bluetooth and works with Google Home, Alexa, SmartThings and Home Assistant.

The Shelly Plus 2PM. Its dedicated cover mode drives shutters, curtains and gates, and it includes per-channel energy monitoring. The single-channel Shelly 1 Gen4 has no cover mode and no energy monitoring.

Buy the Shelly 1 Gen4 if you want a single-circuit relay with Zigbee, Matter and Apple HomeKit, a Zigbee router role and a 16A rating, and value dry-contact flexibility for garage doors and low-voltage loads.

Buy the Shelly Plus 2PM if you want to control two circuits or automate roller shutters and garage doors, value per-channel energy monitoring and full protection at a lower price, and have a live and neutral wire.