Building on what Ivy said, my experience with apps find shifted completely once I paid attention to whether it actually works.
Two people can have opposite results with apps find purely because of whether it actually works. If whether your area is covered isn't sorted, apps find will not go anywhere.
In practice, apps find lives or dies on how many people are actually near you.
Two people can have opposite results with apps find purely because of the density problem.
Curious whether apps find works differently outside big cities? Take that as one data point on apps to find sex are the most popular in college towns, not gospel.
Luvdate was the closest to what I wanted from apps find.