Loop works with Economy 7 meters but there are limitations.
The app will show an accurate measurement of your usage in kWh but there will be inaccuracies in the cost calculations. This is because, currently, we calculate a "blended" price per kWk of electricity and apply that to all energy used through the day and night.
We take a typical Economy 7 night usage percentage (42% of electricity usage during the 7 hours of cheap electricity) in order to blend the day rate with the night rate into a single cost.
We know that this is not completely accurate and do wish to support all forms of time of use tariffs in the future including Economy 7. Please subscribe to our newsletter to stay up to date on new features.