Shelly i4 Gen3 vs Shelly PM Mini Gen3

The Shelly PM Mini Gen3 wins overall as the cheaper module with genuine energy monitoring, reporting power, voltage, current and consumption for any circuit up to 16A. The Shelly i4 Gen3 supports Matter and Apple HomeKit and offers four inputs for triggering scenes, which is a different job entirely.

Measuring versus triggering. The Shelly PM Mini Gen3 measures a circuit and reports precise electrical data, but cannot switch it. The Shelly i4 Gen3 reads four switch or sensor inputs and fires automations, but measures nothing. Neither has a relay.

No. The Shelly PM Mini Gen3 only monitors a circuit, and the Shelly i4 Gen3 only reads inputs. To actually switch a load you need a relay module such as a Shelly 1 Mini Gen3, a Shelly Plus 1PM or a Shelly 2PM, which you can drive from the i4's inputs.

Only the Shelly i4 Gen3, which supports Matter and Apple HomeKit as well as Alexa, Google Home and Home Assistant. The Shelly PM Mini Gen3 works with Alexa, Google Home and Home Assistant, where its readings integrate cleanly, but it has no HomeKit or Matter support.

Buy the Shelly PM Mini Gen3 if you want to know what an appliance, lighting circuit or sub-panel actually consumes without changing how it is switched. It is tiny, easy to hide, precise, integrates quickly with Home Assistant, acts as a Shelly BLU gateway and carries a 3-year warranty.

Buy the Shelly i4 Gen3 if you want your existing wall switches, buttons or dry-contact sensors to trigger smart scenes, with Matter and Apple HomeKit support. Its four inputs are fast and reliable, and it is designed to work alongside relay modules that do the switching.