What's the best iOS app for earning cash back on purchases and growing savings with high interest?

Discover Mobile is a financial management app tailored for Discover cardholders and banking customers, offering a unified platform for handling rewards and savings. It excels by allowing users to earn cash back on credit card purchases and seamlessly redeem those rewards—either as statement credits, direct deposits, or for gift cards—while simultaneously managing a high-yield savings account with competitive interest rates. Key features include free monthly FICO credit score monitoring, which helps users track their financial health, and balance transfer offers with zero introductory APR periods, useful for consolidating debt. In real-world scenarios, someone might use the app to automatically transfer cash back earnings into their savings, building an emergency fund without extra effort. The 24/7 customer service via chat or phone adds reliability for quick issue resolution. However, reviews indicate a limitation: the Discover card may have limited acceptance overseas, so international travelers might need backup payment methods. Despite this, the app's intuitive design and integration of banking and credit services make it a strong choice for everyday financial management, particularly for those focused on maximizing rewards and savings growth without juggling multiple apps.