IAMMETER can compare the energy consumption as below,
You can compare the energy consumption for different meters you added in the same place on IAMMETER. For 3 phase Wi-Fi energy meter(WEM3080T), it can be considered as 3 x single-phase Wi-Fi energy meters.
You can compare the energy consumption in different time period (hourly/daily/monthly/yearly) for the same meter.
Three Phase Wi-Fi Energy Meter
Single Phase Wi-Fi Energy Meter