fiftyFifty Ostalbkreis is an Android application developed by Sebastian Vollmer and is available for free. It falls under the Travel & Navigation category and specifically the Maps & GPS subcategory. The app is designed to provide a safe and affordable transportation service for young adults aged 25 and below in Ostalbkreis. The service operates on Fridays, Saturdays, and evenings before public holidays from 10:00 PM to 6:00 AM the following morning.

The app operates on a fiftyFifty basis, meaning the passenger only pays half the fare, while the other half is covered by the Landratsamt Ostalbkreis and various partners and sponsors. The app works by first registering with the Landratsamt Ostalbkreis within the app. Once registered, passengers can book a ride, show their authorized ID at the taxi, and then enter the taxi details, including the taxi's order number, price, and the number of passengers. The ride is then saved, and the passenger pays half the fare in cash, regardless of the number of passengers. The app aims to reduce traffic accidents caused by inexperienced drivers.