Yeah so Chomp was a small startup working on app store search that Apple bought. End of June 2012 they did a huge update to the search algorithm, that effected a lot of apps.

One of the biggest changes being that free app downloads were weighted much higher. Until that point, I had only paid apps, and things were going pretty well. Overnight, sales got hit really hard. One thing that I didn't really include in the article, but I'm pretty happy with my ability to deal with those changes as well as I was able to. I started adding free apps, and came back pretty well.