Post to r/Android – October 2015 – Free
I made a post to Reddit on r/Android and it blew up! 240 something upvotes, and managed to bring 9,000 downloads on day 1, and some 3,000-5,000 aftewards. Holy smokes! Some other blogs also picked up the news and the app was featured on more blogs, which brought in even more downloads!
Free is best
Result: Around, 9,000+ downloads
Conclusion: One of the best outperformers by far, and it was totally free!