This app was mentioned in 2 comments, with an average of 19.50 upvotes
CarParkour is a parking app for Singaporean users. It's been very slowly growing in users over the past year (even though it's only a few hundred), costs near nothing to run, and makes nothing as well, as it can't hit the minimums required for AdMob.
I used the same data to make this app. I wish we had more complete sources with HDB data that didn't cost $200 and $50 a year.