This web app collects the data automatically each day from Octopus Energy .
Or see the calculations using Octopus Energy data for Tracker tariff: Octopus Tracker tariff calculator
Thanks to those who have already used this link to switch.
A green bar on the chart indicates the best price on the market (except for Octopus Agile ). A blue bar indicates that another supplier might have a lower priced tariff. All green or almost all green and you have a bargain. Time to switch.