Walmart’s Savings Catcher: Walmart is widely known and I think pretty much everyone has entered Walmart at least once in their life.
Target’s Cartwheel: Target I would say is also well known.
Note: If you are someone whose phone is reaching, has reached the space limit, or maybe you just don't like too many apps on your phone know that you don’t necessarily need the app. You could always use both by going online to each of these. The only difference is the scanning function of the receipts for Walmart and scanning of items for Target isn’t available, but you can definitely work around that by manually entering.
Let me know in the comments if you use these which you like best? If you are a first at trying them out let me know what you thought of them. Save away!