I use calibre. By having a column for price and using the date for date bought, as well as shop and whether read, I can get a good picture of how many unread books I have that I've actually paid money for, and how long I've had them.
I shall be resetting my unread count to the total I've found in calibre for next years challenge. It turned out that I had more bought and unread books that I thought at the start of this year, but I don't want to fiddle with the total mid-year.
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