BookTrendr — BSR & Categories on Amazon

Amazon Best Sellers Rank and categories under every book in search, Best Seller lists and carousels. For KDP authors and publishers.

See the Best Sellers Rank of every book on Amazon — without opening a single product page. BookTrendr adds a small strip under each book on Amazon.com. It shows the Amazon BSR (Best Sellers Rank) and up to three category ranks. You see them right where you browse: in search results, on Best Seller category lists and in the carousels on a book's page. Built for KDP authors, self-publishers and authors who research a niche before they write. WHY YOU NEED IT Amazon hides sales rank deep inside each product page. To compare 20 books in a niche, you'd open 20 tabs and scroll to "Product details" 20 times. BookTrendr does that work for you. Search a keyword or open a category, and the rank appears under every title. You spot what sells and what doesn't in seconds. WHERE IT WORKS • Amazon search results — BSR plus category ranks under every book • Best Sellers, New Releases and Movers & Shakers lists — the overall store rank next to Amazon's category position, so you see how much a #1 in that category actually sells • Book product pages — the rank of the book you're viewing, highlighted under its title • "Customers also bought" and other carousels — a compact BSR on every card WHAT YOU CAN DO WITH IT • Validate a book idea — check whether books on your topic actually sell before you write one • Find a category you can win — compare the BSR of the #1 book across sub-categories and spot the quieter ones • Pick better KDP categories — see which categories competing books rank in • Size up the competition — tell real sellers apart from books that only look popular • Research keywords — search a phrase and see at a glance how the books it brings up perform HOW IT WORKS When a book scrolls into view, BookTrendr reads that book's public Amazon page in your own browser and pulls out its Best Sellers Rank and category ranks. Only books you can actually see get loaded, a few at a time. Each book is fetched once per session, so Amazon isn't hit with a flood of requests. PRIVATE BY DESIGN • No account, no login, no sign-up • No data leaves your browser — nothing is sent to BookTrendr or anyone else • No tracking, no analytics, no personal data collected • Only one permission: access to amazon.com pages, so it can read the rank shown there FREE BookTrendr is free to use. No trial, no limits, no credit card. WANT THE FULL PICTURE? BSR tells you how a book sells today. To judge a whole niche — demand, competition, review barriers and an Opportunity Score — use the BookTrendr research platform at research.ai4writers.club. The extension's popup links straight to it. GOOD TO KNOW • Works on Amazon.com (US store) • Some books show "no rank" — brand-new titles and audiobooks often don't have a Best Sellers Rank yet • If you scroll very fast through hundreds of books, Amazon may slow requests down for a moment. Scroll a little slower and the ranks will load. Made by AI4Writers — tools for authors who write with data, not guesses. BookTrendr is an independent tool. It is not affiliated with, endorsed by or sponsored by Amazon. Amazon, Kindle and KDP are trademarks of Amazon.com, Inc. or its affiliates.