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Kontakt is great unofficial client for VK.com.
Released at March, 2016
710.000 unique users, 100.000 DAU, 260.000 MAU, R1 = 50%, R7 = 30%, R30 = 20%. This is achivied on ORGANIC traffic only. We didn't spend any money on marketing.
Frontend: Objective-C, backend: Ruby-on-Rails
Money: the app has several IAP, but it makes money on advertising mostly (we use hyperadx.com). It makes $250 per day.
As a bonus: app's VK.com public group with 21K users