FAQ
Which countries are supported?
SweetSpot supports 30 European countries covering 43 bidding zones:
Austria, Belgium, Bulgaria, Croatia, Czech Republic, Denmark (DK1, DK2), Estonia, Finland, France, Germany, Greece, Hungary, Ireland, Italy (7 zones), Latvia, Lithuania, Luxembourg, Montenegro, Netherlands, North Macedonia, Norway (NO1–NO5), Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden (SE1–SE4), and Switzerland.
Where do the prices come from?
Prices come from the ENTSO-E Transparency Platform, which publishes day-ahead electricity prices for all European bidding zones. SweetSpot also supports four fallback sources for increased reliability:
- Spot-Hinta.fi for Nordic and Baltic zones (15 zones)
- Energy-Charts for 15 European zones
- EnergyZero for the Netherlands
- aWATTar for Austria and Germany
You can configure the data source priority order in settings.
Are the prices accurate?
SweetSpot shows day-ahead market prices — the wholesale electricity prices set by the market the day before delivery (also called spot prices). These prices do not include VAT, energy taxes, network fees, or supplier margins, which vary by country and provider.
The prices are still useful for finding when electricity is cheapest — the app’s main purpose. Costs are shown per 1 kW of load by default; set an appliance’s power rating, or charge an EV, and the estimate reflects the real load. Tomorrow’s prices are typically available after 13:00 CET.
Do I need a special electricity contract?
Yes — to actually save money you need a dynamic (spot or hourly) electricity contract, where the price you pay follows the day-ahead market. SweetSpot shows you when those prices are lowest, but it can’t change what your provider charges: on a fixed-rate tariff the price is the same all day, so shifting when you use power won’t lower your bill.
Can SweetSpot help me charge my electric car?
Yes. Add your vehicle — pick it from a built-in database of thousands of EVs and plug-in hybrids, or enter the battery size and charging power manually. Then enter your current and target state of charge, and SweetSpot works out how long charging will take (from the battery size and the lower of your car’s AC limit and your home charger) and finds the cheapest time to plug in.
Can I make sure it's ready by a certain time?
Yes. Turn on the optional “ready by” deadline and pick a time. SweetSpot then defaults to the cheapest time that finishes by then — for any appliance or for charging your EV (for example, charged by 7:00 in the morning). You can still step to a cheaper time that finishes a little later if you prefer; SweetSpot flags when the shown time ends after your deadline.
Why does the recommended time keep changing?
SweetSpot re-checks the prices while a result is open, and slots that are now in the past drop off as time passes, so the recommended time can shift. Use the Earlier and Cheaper buttons to step between a sooner (slightly costlier) start and the cheapest one — each shows how much more it costs than the recommended time.
Do the costs reflect how much power my appliance uses?
By default, costs are shown per 1 kW of load. If you give an appliance a power rating in kW — or charge an EV, which uses its real charging power — the estimated cost is scaled to that load, so it reflects what the appliance actually consumes.
Does it work offline?
SweetSpot caches prices locally on your device. If you’ve fetched prices recently, you can use the app without an internet connection until the cached data expires. The app will automatically refresh prices when connectivity is restored and the cache is stale.
Does the Wear OS app work standalone?
The Wear OS app syncs appliances and settings from the phone app. Once synced, the watch app fetches prices independently — so it works even when the phone isn’t nearby, as long as the watch has internet access (Wi-Fi or LTE).
The watch app requires Wear OS 3 or later (Pixel Watch, Samsung Galaxy Watch 4+, and other compatible watches).
Can I see the full price I actually pay?
By default SweetSpot shows the wholesale market price. In supported countries (currently the Netherlands) you can turn on Total price (the all-in price) in settings, which adds energy tax, your supplier’s surcharge, and VAT on top of the market price to show the approximate full consumer price. Combined with an appliance’s power rating, this gives you a realistic estimate of what actually running that appliance will cost. It’s display-only — it never changes which time comes out cheapest.
Can I copy my appliances to another device?
Yes. In settings you can share your setup — your appliances, their order, and your EV charging settings — as a QR code or a link. Scan or open it on another device to import everything. It works completely offline with no account and no server: the data travels inside the link or QR code itself, and you choose whether to add to, replace, or pick individual items from what’s already there.
How do I report a problem or suggest a feature?
Open Settings › Help & support and choose Report a problem or Send feedback. Your message is submitted directly from the app — no browser or GitHub account needed — and becomes a public issue we can track. You can optionally leave an email address to be notified of replies (it’s never shown publicly, and every notification has a one-click unsubscribe link), and follow the status of everything you’ve sent under My reports.
How much does SweetSpot cost?
SweetSpot comes with a 14-day free trial, after which an optional yearly subscription keeps it running. You can get it on
Google Play. The source code is available on
GitHub under the GPL v3 license.
Which languages are supported?
SweetSpot is available in 25 European languages: Bulgarian, Croatian, Czech, Danish, Dutch, English, Estonian, Finnish, French, German, Greek, Hungarian, Italian, Latvian, Lithuanian, Macedonian, Norwegian (Bokmål), Polish, Portuguese, Romanian, Serbian, Slovak, Slovenian, Spanish, and Swedish.
The app defaults to your system language. You can also manually set the language in Settings.
