Chart Your Ebook Sales Rank
TitleZ is an app that gives rank and charts sales rank by its highs and lows. You can see your current rank and then averages for 7-days, 30-days, and 90-days.
TitleZ is easy to use. Though it's difficult to attribute a specific promotion to increases in sales, with this app you may be able to correlate some specific promotion push with a sales spike. You can also generate a printable report for each book.
Remember what A. A Milne said, "Almost anyone can be an author; the business is to collect money and fame from this state of being."