Tankschwein billig tanken is a free Android app developed by pocketnavigation.de GmbH that combines the latest fuel prices with good map display, routing, and navigation. What sets this app apart is its ability to find the cheapest gas station along a planned route, whether it's directly on the route or within a certain radius of the route, with minimal detour and almost the best price.

The app continuously monitors whether the selected gas station still offers the cheapest price and provides routing with voice output to the chosen gas station. It also allows for destination transfer to other navigation apps, and the price update interval can be set to as low as 1 minute with the PRO+ version. The app has a clear map display of prices and gas stations and offers various settings, including brand search and filter (e.g., Esso, Aral, Shell, Agip, Total, etc.). It covers all of Germany and has an offline map with PRO+.

With additional features available through in-app purchases, such as offline maps, automatic rerouting when leaving the route, traffic situation, and extensive additional settings, this app is a must-have for every driver who wants to save money on fuel. The app is also ad-free and has excellent support that welcomes questions and improvement suggestions.