Airbnb is an additional app that's worth mentioning for passive income because it lets users make money by renting out extra rooms or properties. Airbnb has grown in popularity asata kegs a means for homeowners to profit passively from their real estate holdings as the sharing economy gains traction. Earning extra money online apps have a lot of potential, but in order to get the most out of them, you need to approach them strategically. Using multiple apps at once is one way to diversify your revenue streams & maximize your earnings.