This is an app created by Walmart. It's claim is that you no longer have to research the local deals to save big. You download the free app and sign up for free and then are to fully trust that Walmart will "catch" the savings of their competitors. How does it work? After you sign up, you take a picture of the bar code on your receipt with the app or type in your receipt number and within 72 hours receive the difference in savings on a Walmart e-gift card.
Sign up online: https://savingscatcher.walmart.com/
or download the app: https://play.google.com/store/apps/details?id=com.walmart.android&hl=en