a) 1 (Audio Footnote, http://audiofootnote.com) b) 1 paid, 0 free c) ~$200 on Google and Facebook ads. Plenty of emailing to blogs. Small email list. A few reviews on app blogs but nothing huge. d) negligible income, but I am still in the red on development and marketing costs so I would not call it income. Here's hoping something positive happens;-)