Free tools
Calculate, compare, save. No sign-up, no email, a source for every number — made by our newsroom.
Each tool answers one question about your home with your own numbers, and ends with what to do about it.
What does your electricity cost?
The running cost of every device — and which ones quietly draw power in standby, with a fix that pays back in months.
Open →Night shift
What you save when the car, the water heater and the washing machine run on a night tariff — and how to automate it.
Balcony solar
Output, savings and payback of a plug-in solar kit, with your country’s rules and subsidies.
Works With checker
Will X work with Y? Matter, Thread, Zigbee and the big ecosystems, answered in one place.
Why are they free?
The tools lead to products we have tested. If you buy through our link, we may earn a commission at no extra cost to you. Every number carries its source. How we earn
- no sign-up
- no dark patterns
- ENERGY STAR / DOE / LBNL data
Get the Energy brief
Every Friday: prices, subsidies and what changed in your market.
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