What is a niche's top ten?

A niche's top ten are the first ten apps a store shows for its search phrase — the competition a new app has to beat to be seen.

Most people never scroll past the first few results, so the top ten is effectively the whole market for a search. Their ratings, prices, ages and update habits describe how hard the niche is.

The top ten differs by store and by country: the same phrase can have different leaders in the US and in Germany.