Get approved by the app store
The Apple App Store and Google Play each have their own developer guidelines you must follow in order to be listed in their app stores. There are literally hundreds of reasons they might reject yours, so pay attention. And while Google's review process is famously lax and fast, Apple plays a little harder to get and takes about a week.
Budget for marketing, and cross your fingers
Once you’re live in the app store, you can’t rely on word of mouth or front-page placement to bring in more downloads. That’s why you should have a robust marketing budget (re: more cash money!) to get the right people’s attention. Better yet, you'll want to get a celebrity or two on board to shill your stuff (pro tip: try Ashton Kutcher). Did we mention you're going to need a lot of money?
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Joe McGauley is a senior writer for Thrillist, and has forgotten way more "genius" app ideas than he's remembered.