Investing in stocks or cryptocurrency is a popular way to generate passive income with apps. A lot of investing apps make it simple for users to buy and sell stocks or crypsatta.king resulttocurrencies, and some even have automated investing features that can help users accumulate wealth over time. Apps for rewards & cashback are another well-liked source of passive income. By offering cashback or reward points for using their platform to make purchases, these apps give users the chance to make money on their regular purchases.