The cheapest station is often not the best one. Driving eleven kilometres to save two cents costs more than it saves, and no app tells you that. Tanica subtracts the detour from the saving and ranks on what is left.

• 63,000stations in ten countries, read on 3 October
• 172countries with an official price, the most recent available

The saving, minus the detour

Price difference times the litres you are actually putting in, minus the fuel the detour burns — and the detour is burned at the price of the station you are driving to, not the one you left. Below twenty-five cents of net gain, Tanica does not pretend you found a deal.

Station by station, in ten countries

Québec, France, Spain, Italy, Slovenia, Croatia, Andorra, Mexico, Argentina and Australia (New South Wales, Tasmania and the Northern Territory), from the public body that collects the prices in each. The app downloads the country you are in — and the countries of your favourites — and nothing else. Outside Québec the price is shown in your currency — the phone’s, or the one you pick in Settings — and your unit first, with the pump price underneath. In Québec the Régie’s ¢/L stays the price shown; your currency appears beside it, marked “converted”.

Averages everywhere else

National averages or regulated prices for 172 countries on every continent — the 27 of the European Union, the United Kingdom, the United States, Canada (with the Atlantic provinces’ maximum prices by zone), Brazil, India, Pakistan, Kazakhstan, Ghana, Tanzania, Saudi Arabia, Colombia, Peru, Fiji and Central America among them, some read straight from the official PDF — plus regional averages where the source allows it, such as Greece’s 51 prefectures, and a world average. Where no national body publishes prices, the latest World Bank or UN World Food Programme figure fills in, dated and left out of the averages. On the map, a “?” button lists the sources of the prices on screen. Each one names its source; continent averages appear once three countries are covered. A widget shows the average where you are, converted at the European Central Bank rate (or the National Bank of Poland’s for currencies the ECB does not quote).

On my way

Give it a destination and it looks in a three-kilometre corridor along the route, then asks Apple Maps for the real detour — there and back onto your route — for the best candidates. The reference is the cheapest station that costs you almost nothing to reach.

Membership stations, counted honestly

A station that requires a membership is marked as such and left out of the best pick unless you say you are a member. A price you cannot buy is not a price.

On the wrist, on the Home Screen, in the Dynamic Island

A standalone Apple Watch app that fetches the data itself, two widgets, a Live Activity that follows a trip, and Siri. In the car, with Pro, CarPlay shows the map as you drive, each station with its price, opens the route with a single tap, and lets you pick the fuel and the units without picking up the phone.

Price alerts, on the device

Set a threshold on a station and the phone checks in the background, at most once an hour, and tells you when it drops. Nothing about the alert leaves the phone — there is no list of your watched stations anywhere but on it.

With no signal

Tanica ranks stations on the last prices received, shown with their time, and estimates the detour. Fresh prices, On my way and alerts need a connection.

What leaves, and who receives it

Our relay receives nothing but the name of the file you ask for — the same for everyone in a country — and the fingerprint of the copy you already have: the whole country's prices come down, and every calculation happens on the phone. Apple Maps is the other side of that coin — it receives your starting point, your destination, what you type in the search field and the candidate stations, because that is what computing a route means. The privacy page says so in those words.

Free, and what Pro adds

The map, the list, favourites, the net saving itself, the widgets, the Watch and Siri are free, with no ads and no account. Pro adds On my way, the CarPlay screen, the Live Activity and price alerts, by the year or once for life, either one shared with your family.

Where the prices come from

Only from public bodies, never from a private aggregator. In Québec, Régie essence Québec, Régie de l’énergie, which authorised the reuse in writing on 2 October 2026: prices are shown exactly as published, the source is on every screen that shows one, and Tanica is not mandated by the Régie. Elsewhere: the ministries, regulators, statistics offices and state oil companies of each country, all named in the app — from France’s economy ministry and the European Commission to Peru’s Osinergmin and Norway’s SSB. Savings, rankings and averages are Tanica’s own calculations, and say so.

Thirteen languages: English, French, German, Spanish (Spain and Latin America), Italian, Japanese, Korean, Portuguese (Brazil and Portugal), Russian, Arabic and Chinese (Simplified).