Watt Futé for iPhone and iPad
Am I on the right tariff?
Base, Off-peak or Tempo compared on your own consumption, and your bill decoded line by line. Official sources, no account, no ads. For households in France.
- CRE grids, Journal officiel taxes, RTE colours
- Base, Off-peak and Tempo compared
- Your bill, line by line
- Free. Widgets as a one-time unlock
See it at work
See it at work
Five things it does, in the order you will use them.
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The right tariff
Base, Off-peak or Tempo, on your consumption
Your option, your power, your yearly kWh from the bill and the share you can run at night. Three yearly bills side by side at the grids in force, dated, the cheapest marked and the difference in euros a year. The night share that makes Off-peak win and what Tempo's 22 red days change. An estimate from your answers, with the calculation shown.
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My bill, decoded
Where the money goes
Type a few lines of your bill, or pick its PDF: it is read on your iPhone, nothing is sent. Your all-in kWh next to the production cost of the nuclear fleet assessed by the CRE, then every line in euros: supplier, network, excise, CTA, VAT, and the VAT charged on the taxes. France, the United States and China on one scale. Every figure with its source and date.
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Using less
What each appliance costs
Water heater, dryer, washing machine, dishwasher, heating, car charging: euros per cycle and per month at your real price per kWh. ADEME average consumption, editable, and the best slot in the next 24 hours when you are on Off-peak or Tempo.
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Red days and off-peak hours
If that is your tariff
For Off-peak and Tempo contracts: today's and tomorrow's colour from the RTE calendar, the remaining red, white and blue days of the season, your off-peak hours entered once, and the best slot for each appliance. Base households never see this screen.
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The price over time
The regulated tariff since 2010
Your all-in price per kWh from 30 days to all time, as a step line that changes at each revision (1 February, 1 August), the taxes stacked under it, and the production facts of the French fleet with their sources. Share the chart as an image.
Widgets
One purchase, Family Sharing
Widgets
One purchase, shared with your family, that supports the app's development. Everything else is free and stays free: tariff comparison, decoded bill, appliances, alerts and history. The price is the App Store's.
- Home Screen widget: your price per kWh and the next revision date, or the colour of the day if you are on Tempo.
- Lock Screen widgets: today and tomorrow at a glance, inline, circular or rectangular.
- Free alerts for everyone: red day tomorrow, off-peak start, a new tariff grid or a tax change, as notifications, with a history you can clear.
Official and private
Official sources
The regulated tariff grids come from the CRE deliberations, the taxes from the Journal officiel, the colour of the day from RTE's open data and the average consumption of appliances from ADEME. Updated at each revision, 1 February and 1 August. Every figure in the app carries its source and its date.
Sources: CRE, Journal officiel, RTE, ADEME
Private
No account, no ads, no tracking, no location. Your answers and your bill stay on your iPhone; the PDF of your bill is read on the device and never uploaded. Anonymous usage counts (the action and the country, never your data) can be switched off in Settings.
Questions
Questions
Is the comparison a reading of my meter?
No. It is an estimate from your answers: your option, your power, the yearly kWh printed on your bill and the share you can run at night. The three bills are computed at the grids in force, dated, and the calculation is shown next to the figure.
Does it work with my supplier?
The comparison uses the regulated tariff grids (Base, Off-peak, Tempo), which most households are on. If you are on a market offer, type your own kWh and amount in the bill screen: the decoded lines and the taxes are the same for every supplier.
What does the unlock include?
The Home Screen and Lock Screen widgets, for good, shared with your family. Everything else, the comparison, the decoded bill, the appliances, the day colour, the price history, the alerts and the notification history, is free.
Where does my bill go?
Nowhere. The lines you type and the PDF you pick are read on your device. Only the figures you confirm are stored, on your device, with your widgets. The app downloads the tariff and colour files from Decodr.tech once a day, with no identifier.
Which devices and languages?
iPhone and iPad, one purchase covers both. The app is in French and English, with a Language setting (automatic by default) and an Appearance setting (system, light or dark). It is made for households in France.
The right tariff for your consumption.
Free. Widgets are a one-time unlock, no subscription.
Available soon on the App StoreiPhone and iPad, one purchase covers both.
Built by Decodr.tech
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