What are the best cashback, stock-back or shopping rewards apps to use to get even more rewards from buying at Starbucks?

I know Get Pei app, Bumped app, and Drop app all give rewards for purchasing at Starbucks using your credit card, but I am wondering if anyone knows any other cashback or stock-back or shopping rewards apps that give bonuses or rewards for purchasing items/using your credit card or debit card at Starbucks?