Sandwich shop chain Pret A Manger is celebrating the launch of its new Android and iOS mobile app by treating the first 50,000 customers who download it to five free coffees each, according to a press release.

The app also sees the launch of a coffee stamp card, giving users a hot or iced drink on the house for every eight they purchase.

"Our hardworking teams take great pride in being generous and having fun with customers," Jo Brett, Pret's U.S. president, said in the release. "We're pleased that this new app will give us even more opportunity to brighten their days with random acts of kindness, as well as being able to offer an even faster and more personalized customer experience."

The in-app payment, made via a quick scan of a QR code on the user's phone at the register, ensures customers can purchase their favorite Pret food and drinks even faster.

Users can also explore Pret's full menu of sandwiches, salads, baguettes, sweet treats, drinks and hot options in the app, find nutritional and allergen information, and set dietary preferences, to see, for example, only veggie or vegan options. The 'Find a Pret' feature locates the user's nearest shops and offers directions.

The Pret app runs on the LevelUp platform. It is available to use in all of Pret's U.S. locations, excluding Pret's University of Pennsylvania and University of Chicago shops, where it will be made available in 2018.