Hi there, the source for these numbers is the StackOverflow API. Just to clarify, the chart we have in the blog is showing question _views_, not questions tagged. There are more questions for other frameworks still (since they're more mature technologies), but we're seeing lots of views of questions tagged with Flutter.
Thanks for the clarification. Using 'number of views' would seem to be a valid metric, so now I'm not so sure about which graph is more realistic.
Yes, these numbers (GH stars, SO questions, etc.) don't seem to tell much.
A few months ago I read that React is way ahead of and still growing much faster than Vue, but people nevertheless hype it based on its GH stars.
http://sotagtrends.com/?tags=[ionic-framework,react-native,f...
That is, Flutter is shooting up and overtaking Xamarin but still only half the popularity of React Native. This also roughly correlates with mentions on Google Trends:
https://g.co/trends/y9Z8q
On job websites React Native is way ahead - which you would expect given React Native's headstart. For example, www.jobstreet.co.id currently has 43 jobs for "React Native" but only 5 for "Flutter".