If you’re planning a long drive or an extended road trip, how do you know if a better price is lurking just over the horizon? Gasoline apps can answer that question by finding the best prices in your area or along your route, either based on crowdsourced information or data from an industry group.

Gas Buddy is a feature-rich gas app, but its routing feature is a must-have when planning a road trip. This feature lets you enter your current location and destination, verify your route, and then see the best gas prices along the way. GasBuddy’s website takes things a step further by letting you enter your vehicle’s year, make, and model, along with your starting point and destination, to automatically generate an itinerary based on gas prices along your route.

In addition to the great trip planning feature, Gas Buddy also has a gas station and price finder, an outage tracker, and a payment feature to help you save money. The app is completely free to download and use, but premium members get some extra perks, such as higher savings on fuel purchases and free roadside assistance, which can also come in handy on a long road trip.

Google Maps is a mapping and route planning app, not a dedicated gas app, but it does a great job of quickly showing you local gas prices. It lacks many of the advanced features you’ll find in dedicated gas apps, but its big advantages are that it’s fast and easy to use, and chances are you already have it on your phone. It comes pre-installed on Android devices, and you can also download it for free from the iOS App Store.