Hi orta! The estimate is calculated from a mix of indicators: # of downloads, # of forks on Github, traffic to our docs, apps on GitHub, apps on the App Store and a few other things, using the same kind of math MongoDB and others have been using to publish this sort of stats in the past (it’s not cumulative at all, and there’s a healthy safety ratio built into the math to provide a very conservative estimate). Of course, this calculation leaves out important sources for which we do not have stats, such as Dash docs visits, people downloading from the same company/proxy — and CocoaPod downloads ;)