Thanks, I was looking for the source.

Where are you getting this data from? How would any one site know the revenue numbers of multiple competing apps like that, with any degree of confidence?

appmagic.rocks

this is analytics service like appannie (data.ai), sensor tower etc. they plug into apps analytics and collect data for a lot of apps, extrapolating the collected data on all other apps. usually both revenue numbers and downloads are pretty spot on