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So the new trend with app developers is creating a paid app around a free data set. Cal AI, which estimates calories from photos of your food, reported around $40 million in sales, but its systems just learned from open data sets that had food images and calorie information. And this goes way beyond calorie trackers. There's free public data for weather, transportation, jobs, books, movies, you name it. And the most interesting part is you don't even

have to use one source. For instance, having map data, live train time data, and event information data lets you create an app that lets people plan their days around the last train ride home. Now you've consolidated all of these data sets into one convenient app that someone will probably pay for. There are so many untapped ideas just from what you can combine and the person you're building for.

And you don't have to invent all the pieces yourself. Fortunately, there's a collection on GitHub called the Public APIs. It's organized by category with links to services your app can connect to. Now you have hundreds of sources to build around when you ask your AI for an app idea.