Hi Marta,
I absolutely love the app. It's both an amazing new lens through which to explore Wikipedia, and a fantastic tool for oversight. One thing I noticed when I was using it was that some of the most "controversial" articles -- by whatever algorithmic definition the app uses -- are actually very well worded to avoid sexism/racism/mainsplaining and other phobias. That is somehow either 1) by virtue of their controversiality or 2) because I viewed them after they'd already been cleaned up, there was not much bias to report.
It might be nice to have a "free of these biases" button available as well as the canonical bias buttons. With this click the controversial measurement might be decreased. This feedback loop, might keep the many articles getting attention fresh.
Anyway, amazing work on the app, an exemplary blend of user interface and bias-addressing theory.