If you want to track your book sales or sales rankings, here are 3 ways to do it:
NovelRank is a free website where you can track your Amazon Sales Rank at all the countries where Amazon has a sales outlet: UK, Canada, France, Germany, Japan, China, Italy, and Spain. They offer the ability to track print and ebook sales along with charting, RSS feeds, and real-time data.
Book Chart Info
BookChart.info is tracking "180,046 books by 95,133 authors. These books have appeared on the iTunes charts about 15,702,000 times across 54 genres in 6 countries since 1 May, 2011."
This website charts sales at iTunes. Use BookChart for a number functions including viewing past iTunes Book Charts. Use the chart pages to find out which books moved up on a chart, which books have fallen on the charts, and which books are new. BookChart.info is currently tracking 180,046 books by 95,133 authors. These books have appeared on the iTunes charts about 15,702,000 times across 54 genres in 6 countries since 1 May, 2011.
Rankforest is another way to monitor market performance and Amazon sales trends. The Basic Account is free. You can change account status at any time. With paid accounts, you can view historical data, export, read reviews, set up alerts, compare multiple titles.
Like it or not, if you want to be successful as a writer, you must also be a good business person. Studying statistics to see what's working and what's not is crucial to long-term success.