While building apps for Apple (or Android) mobile devices can be a lucrative way to generate passive income online, it's not as easy as many people make it seem. Beside the fact that it’s hard to get your app noticed among the millions being released every year, most people expect apps to be either free or very inexpensive. In fact, a recent study found that only 11% of apps are paid for. The number of paid apps will only decline over time as more players join the market. The key, like many of the business model mentioned here, is to be strategic and creative from the very start. There are a few ways to monetize your app and keep it free for users. Examples include advertising, premium services, and sponsors.
Here’s a good example of how lead sales can work in real life: My second website, Life Insurance by Jeff, brings in a ton of traffic from people who are searching the web to find answers to life insurance questions. While I used to have the website set up so I could sell these people life insurance myself, it was a lot of work to process all the different requests and clients. As a result, I started selling the leads I gathered instead.

This is one of my investments. It’s a very simple index fund. Took about 5 minutes to set up and it automatically withdraws from my bank account each month. Spend five minutes couponing and you’ll save a few bucks. Spend 5 minutes setting up an index fund and you’re likely to build substantial wealth over time if you invest consistently and don’t pull your money out with every little fluctuation in the market.

Robo-advisors are diversified investment accounts that are automatically managed by a computer algorithm (as opposed to a human money manager). If you want to invest, but don’t have the money, or don’t want to invest with a money manager, robo-advisors are for you! Robo-advisors make investing easier—and cheaper—so they’re perfect for new investors.