Author Rosanne Dingli recently pointed out that Novelrank can become a useful tool for tracking Amazon sales of an author’s books.

And Novelrank is free for authors.

Dingli writes, “You register each of your titles (they must have had at least one sale to be registered) and create a “user page” that lists all the books you register. Check it once a day, to determine whether any sales have been recorded. Sales come up about 6 – 10 hours after Amazon changes the ranking. Although Amazon says they refresh every hour, rankings do not change until about 6 hours a sale takes place – I’ve checked this and tested it with other authors.”

Try it, you’ll like it: Novelrank.