I built a developer tool to help users validate Universal Link configuration on iOS [1]. At the time, Apple didn't have a tool to do so, so it was difficult to figure out why it wasn't working if it wasn't. They've since created one, so that's great for the community [2].
I still get consistent traffic of a few thousand hits per week, and my work has been forked by my former employer, Branch, to create their own version of the tool for iOS [3] and Android [4]. My goal wasn't really to take it anywhere, it was just something I wanted to build for the community since I spent a lot of time struggling with the set up, and saw a lot of similar struggle in the beta forums. I'm satisfied with how it turned out, and how many people used it (for instance, the several of the Cocoapods team members linked it, it's all over the forums, etc).
So, no story about how much money it made or anything, but personal satisfaction at least :)
I still get consistent traffic of a few thousand hits per week, and my work has been forked by my former employer, Branch, to create their own version of the tool for iOS [3] and Android [4]. My goal wasn't really to take it anywhere, it was just something I wanted to build for the community since I spent a lot of time struggling with the set up, and saw a lot of similar struggle in the beta forums. I'm satisfied with how it turned out, and how many people used it (for instance, the several of the Cocoapods team members linked it, it's all over the forums, etc).
So, no story about how much money it made or anything, but personal satisfaction at least :)
[1] https://limitless-sierra-4673.herokuapp.com [2] https://search.developer.apple.com/appsearch-validation-tool [3] https://branch.io/resources/universal-links/ [4] https://branch.io/resources/app-indexing/