Shelly 1 Gen4 vs Shelly 1PM Gen4 comparison

Updated July 2026

Data from Amazon and official Shelly site.

2026 verdict

The Shelly 1 Gen4 takes this smart relay comparison as the more affordable option that lists a fuller safety picture, with overheating protection confirmed on top of the shared multi-protocol core. The Shelly 1PM Gen4 answers with the one thing it is named for: built-in energy monitoring (instant power, voltage and total consumption) that the plain Gen4 skips, and it carries the higher owner rating. Otherwise the two are close siblings: both are single-channel relays rated 16A, both add Zigbee to Wi-Fi, Bluetooth and Matter with a Zigbee router role, both use dry and wet contacts, and both work with Alexa, Google Home, Apple HomeKit, SmartThings and Home Assistant without a hub for core control. Choose the Shelly 1 Gen4 if you want the cheaper relay and do not need metering; choose the Shelly 1PM Gen4 when you want to measure a circuit's power while you control it.

Feature	Shelly 1 Gen4	Shelly 1PM Gen4	Winner
Price	$24.99	$28.99	Shelly 1 Gen4
Rating	4.4	4.6	Shelly 1PM Gen4
Safety	Overheating protection	None	Shelly 1 Gen4
Energy Monitoring	NO	YES	Shelly 1PM Gen4
Connectivity	Bluetooth, Zigbee	Bluetooth, Zigbee	Tie
Integrations	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter	Tie
Relay Channels	1	1	Tie
Power Off Memory	NO	NO	Tie
Dry Contact Mode	YES	YES	Tie
Wet Contact Mode	YES	YES	Tie
Zibgee Router	YES	YES	Tie

Winner

Shelly

Shelly 1 Gen4

$24.99

Buy on Amazon USA

+ Price: $24.99
+ Safety: Overheating protection
- Rating: 4.4 vs 4.6
- Energy Monitoring: NO vs YES

Shelly

Shelly 1PM Gen4

$28.99

Buy on Amazon USA

+ Rating: 4.6
+ Energy Monitoring: YES
- Price: $28.99 vs $24.99
- Safety: None vs Overheating protection

Frequently Asked Questions

Which is better overall: Shelly 1 Gen4 or 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.

What is the biggest difference between the Shelly 1 Gen4 and the Shelly 1PM Gen4?

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.

Which relay measures energy usage?

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.

Do both support Zigbee and the same platforms?

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.

Who should buy the Shelly 1 Gen4?

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.

Who should buy the Shelly 1PM Gen4?

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.

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