Two free gas apps are GasBuddy and MapQuest Gas Prices. Both apps are available for free on Android and iPhone operating systems, and they display local gas prices that have been submitted by app users.
GasBuddy is also available on Windows phones and BlackBerries. It features a point system for a regular contest, and the website includes a convenient QR code phones can scan to quickly access the download page for the app.
The MapQuest app automatically detects the user's location to find gas prices. The search results have distance and price sorting options to find the closest or the lowest priced gas.