What's a good Android app for earning rewards while building credit from scratch?

Atlas is a hybrid financial tool that serves both as a rewards credit card and a credit-building instrument, making it particularly suitable for individuals new to credit. Its primary mechanism involves issuing a line of credit, with all payment activity reported to the major credit bureaus. Users have noted significant, rapid improvements in their credit scores, with one review citing an 86-point increase, which directly addresses the core goal of building a history. The app earns its 'rewards' designation by offering cashback on common spending categories like dining, travel, and online purchases, turning everyday expenses into a minor income stream or statement credits for services like Uber Eats. However, the product includes a notable monthly fee, which some users find detracts from the value proposition. This fee and the resulting recurring balance reported on credit statements are consistent points of feedback. For someone with limited or no credit history who also wants to earn something back on regular spending, Atlas presents a viable, all-in-one option, though the monthly cost requires evaluation against the rewards and credit benefits gained.