Mybefia is a great, simple service that allows you to compare how popular are three iPhone Applications, based on Ranking, Popularity and Market share.  If a new application is still less popular than an incumbent, but gaining popularity, you’ll see it there.

The service does not publish download figures, but stores top-downloads rankings every day and offers an easy-to-read summary.

Plus: Win a 50$ prize! If you manage to find out what “Mybefia” stands for, you can win a iTunes voucher.  My take? It’s either an acronym for My Best Estimation of how Fantastic this iPhone App is — or a Japanese word. As I don’t speak Japanese, I’ll go with the acronym.