After signing up, Happn showed me 68 users it said I had crossed paths with in the preceding three hours, though I hadn't left my apartment all day. This might be helpful if you're looking to date your immediate neighbors (or Uber drivers), but I don't see the attraction when competitors like Tinder already show the distance between you and other users. Frankly, if I saw a cute guy in a coffee shop, I'd just approach him rather than check to see if he's on Happn. The app seems designed for people who don't want to use online dating but who also don't want to approach people in real life. Pick a lane.
Something that I have learned over the past few years is that if you track something, be it your eating habits, exercise, writing time, work time, etc. you become aware of the reality of the situation. This is why most diet gurus tell you to track what you eat for a week so you have an awareness of the of how you really eat before you start your diet and exercise regimen.