See what last year’s electricity would have cost on other tariffs.
Works whoever supplies you. Bring a year of your smart meter readings and we replay it, half-hour by half-hour, against the tariffs we cover in your region. No sign-up, no app, and your data never leaves your browser. Every result is an estimate, with the dates and assumptions shown.
Example figures
Right now
Electricity has a time of day.
On a time-of-use tariff, the same kettle costs different amounts at 3am and 6pm. Whether that helps you depends on when your home actually uses power.
Loading today’s prices…
How it works
Your real year, replayed.
Connect your data
Upload a CSV of your half-hourly readings. It’s read on your device and never uploaded.
We replay your year
Each half-hour is priced on every tariff that fits your region, payment method and home.
See where you stand
Tariffs ranked by estimated cost, with each one’s worst month. “You’re already on the cheapest” is a fine answer.
Your data
Built to be trusted with your meter.
We can look, but not touch
Read-only access. We never change anything on your supplier account or control any device.
Nothing kept by default
Your readings stay in your browser. Close the tab and they’re gone.
No commission
Switch links go straight to the supplier. We earn nothing from them, so they can’t sway the ranking.
The maths is on the page
Every result shows the period replayed, the rates and when we checked them, and what we assumed.
Find out where you stand.
Free, no sign-up. Or try a made-up sample home first.