[uxwtf]

Productivity apps are never in top 10 on app store. The efforts you spent building your app did not pay, but I don't think you should blame app store for that. I would suggest not to take it as a failure of the mobile app concept. Learn form your experience and think about what you can improve.

[Tloewald]

PDF Expert and Notability are in the bestseller lists right now. There have been productivity apps in the charts, although they don't dominate.