Shelly 1 Gen3 vs Shelly 1 Gen4

The Shelly 1 Gen4 is better overall, adding Zigbee (and a Zigbee router role) to its Wi-Fi, Bluetooth and Matter connectivity and listing more safety protection. The Shelly 1 Gen3 wins if you need a no-neutral install, want the cheaper unit or prefer the one with the higher owner rating.

Connectivity and wiring. The Gen4 adds Zigbee to the Gen3's Wi-Fi, Bluetooth and Matter and acts as a Zigbee router, but it requires a neutral wire. The Gen3 has no Zigbee and no router role, yet it installs without a neutral, which the Gen4 cannot do.

Only the Shelly 1 Gen3. It is designed to run in boxes without a neutral, a common obstacle in older wiring. The Shelly 1 Gen4 requires a neutral wire, so check your box before choosing the newer generation.

Yes. Both the Shelly 1 Gen3 and Shelly 1 Gen4 offer dry and wet contacts, a 16A rating, and work with Alexa, Google Home, Apple HomeKit, SmartThings and Home Assistant plus Matter, all without a hub for core control. The Gen4 simply adds Zigbee as an extra option.

Buy the Shelly 1 Gen3 if your box has no neutral wire, or if you want the cheaper, higher-rated relay and do not need Zigbee. It still delivers Wi-Fi, Matter, dry contacts and hub-free local control.

Buy the Shelly 1 Gen4 if you want protocol flexibility across Wi-Fi, Bluetooth, Zigbee and Matter and a Zigbee router to extend your mesh, and your box has a neutral wire.