Winner
Updated September 2026
Data from Amazon and official Sonoff and Zemismart sites.
2026 verdict
SONOFF POWCT beats Zemismart SPM02 in 2026, with its clearest edge on price, integrations, and data & monitoring.
It separates itself most clearly on price, integrations, and data & monitoring, while still looking better on relay output and load management. You should still consider Zemismart SPM02 if metering matters more than raw overall balance. For the average buyer, SONOFF POWCT is the safer choice.
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| Feature | SONOFF POWCT | Zemismart SPM02 | Winner |
|---|---|---|---|
| Price | $38.19 | $42.60 | SONOFF POWCT |
| Metering | Solar Net Metering | Three-Phase Support, Solar Net Metering | Zemismart SPM02 |
| Integrations | Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter | Home Assistant | SONOFF POWCT |
| Data & Monitoring | Data Export, Usage Alerts | Usage Alerts | SONOFF POWCT |
| Relay Output | YES | NO | SONOFF POWCT |
| Load Management | YES | NO | SONOFF POWCT |
| Breaker Panel Install | YES | YES | Tie |
| Smart Meter Port | NO | NO | Tie |
| Connectivity | 2.4 GHz WiFi | Zigbee | Tie |
Winner
- + Price: $38.19
- + Integrations: Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
- + Data & Monitoring: Data Export, Usage Alerts
- - Metering: Solar Net Metering vs Three-Phase Support, Solar Net Metering
40% OFF
$42.60
$70.99
- + Metering: Three-Phase Support, Solar Net Metering
- - Price: $42.60 vs $38.19
- - Integrations: Home Assistant vs Google Home, Alexa, Apple HomeKit, Samsung SmartThings, Home Assistant, Matter
Frequently Asked Questions
Which is better overall: SONOFF POWCT or Zemismart SPM02?
SONOFF POWCT has the stronger overall profile in this comparison, especially for price, integrations, and data & monitoring.
What is the biggest difference between SONOFF POWCT and Zemismart SPM02?
Price is one of the clearest differences: SONOFF POWCT lists $38.19, while Zemismart SPM02 lists $42.60.
Which one looks better on price?
SONOFF POWCT is listed at $38.19, while Zemismart SPM02 is listed at $42.60. SONOFF POWCT (better spec).
Who should buy SONOFF POWCT?
Choose SONOFF POWCT if your priority is price and integrations and that matters more than metering.
Who should buy Zemismart SPM02?
Choose Zemismart SPM02 if your priority is metering and that matters more than price.
Full comparison table
Compare all 23 Energy Monitors side by side
You are looking at two of them. The full table lines up all Energy Monitors in the catalog with the same specs, so you can filter by what you need and sort by price or rating.
- 23 Energy Monitors
- 46 specs compared
- 43 filters
SonoffMINI PM Matter Over WiFi Power Meter (Non-Switch)
$15.90
ShellyPro EM-50
$119.99
EmporiaVue 3
$199.99
ShellyEM Gen3
$69.99
Shelly3EM-63W Gen3
EmporiaVue 3 3-Phase
$209.99
RefossEM01P
16% OFF$82.99$69.99
ShellyEM Gen4
- Sonoff
POWCT
$38.19 
ShellyEM Mini Gen4
$24.99
RefossEM06P
ShellyPro 3EM v2
$154.99
ShellyPro 3EM 3CT63
$150.99
MerossEM16P
20% OFF$199.99$159.98
ShellyPro 3EM-400
$329.99
RefossEM16P
15% OFF$199.99$169.99
MerossEM06P
AeotecHome Energy Meter 8
$95.99
SonoffMINI PM Zigbee Power Meter (Non-Switch)
$15.90
EmporiaVue Utility Connect
$39.99
Air Quality MonitorsSonoffSAWF-07P Air Quality Monitor
3.7(188)$39.90
Air Quality MonitorsSonoffSAWF-08P Air Quality Monitor
4.3(169)$49.90
CamerasSonoffCAM GlassView
5.0(1)$34.90
CamerasSonoffCam Outdoor DUO
$79.90
CamerasSonoffCam Slim Gen2
4.4(170)$19.90
CamerasSonoffGK-200MP2-B
4.0(149)30% OFF$9.99$6.99
DisplaysSonoffNSPanel Pro Gen2
3.3(10)€149.90
DisplaysSonoffNSPanel Pro
4.1(72)$129.90
DonglesSonoffDongle Lite MG21
4.5(432)$24.90
DonglesSonoffDongle Max
4.3(590)
DonglesSonoffDongle Plus MG24
4.7(664)$35.90
DonglesSonoffDongle Plus PP10
4.6(78)$35.90
DonglesSonoffDongle-PZG23
4.6(171)10% OFF$39.90$35.91
DonglesSonoffZBDongle-E
4.6(3,722)$24.90
DonglesSonoffZBDongle-P
4.5(5,667)15% OFF$39.99$33.96
Door & Window SensorsSonoffDW2-WIFI
3.8(1,062)$12.23
Door & Window SensorsSonoffSNZB-04 ZigBee Wireless Door/Window Sensor
3.8(102)$17.99
Door & Window SensorsSonoffSNZB-04P ZigBee Door/Window Sensor
4.0(13)$18.99
Door & Window SensorsSonoffSenseGuard DW Gen2
4.4(182)- Energy MonitorsSonoff
MINI PM Matter Over WiFi Power Meter (Non-Switch)
5.0(1)$15.90
