INDIANAPOLIS — Marsh Supermarkets Inc. has launched a new mobile app that it says can help its shoppers turn “downtime into dollars” by paying them for interacting with national brands.

“Marsh is excited to help our customers capture significant savings with this first-of-its-kind app,” said David Palmer, senior vice president of marketing, sales and advertising for Marsh. “Fresh Lettuce turns our customers’ downtime into dollars they can use to spend on anything they want in our stores, no matter what is in their basket. The customers are in control of what ads they see, when they choose to see them, and how they want to spend their earned dollars in our stores.”

Customers who download the Marsh Fresh Lettuce app will be asked to link their Marsh Fresh Idea customer loyalty card to the app, although the retailer promises that no personal information is exchanged with suppliers. Shoppers can then engage with their favorite national brands by watching short interactive ads and videos, and by doing so they earn cash that is loaded directly to their Marsh Fresh Idea card. Those earnings are then applied to their purchases during checkout, no matter what products are in their basket.

Marsh’s Fresh Lettuce app is available for free download in the iTunes and Google Play store.