BookScope — KDP BSR & Sales Estimates

Stop guessing whether a niche sells. See the numbers on the search page. BookScope is for self-publishers doing KDP niche research. Search Amazon for a keyword, open a Kindle or Books bestseller list, and BookScope adds a compact data strip under every result: - BSR — the Best Sellers Rank, read from the product page when the search card doesn't show it - Estimated sales/day — from the BSR, using a US Kindle curve adjusted for print books and scaled down for smaller Amazon stores - Estimated revenue/month — sales × price × royalty, with the royalty basis (70%/35% Kindle bands, print minus printing cost) shown on hover - Reviews and rating - Format and page count — Kindle, Paperback, Hardcover - Publication date and an Indie tag when the book looks self-published (no publisher listed, "Independently published", or the publisher is the author) A summary bar pinned to the top of the page rolls up everything on screen: results analysed, average and median revenue/month, average review count, percent indie, and an at-a-glance Opportunity rating Works on amazon.com/co.uk/ca/de/in/au — search results and Best Sellers pages, Kindle and Books. Built to stay out of the way - Read-only. BookScope never clicks, adds to cart, or changes anything on Amazon. It only adds its own small panels. - Small, neutral styling that fits Amazon's layout. - Product pages are fetched gently — a few at a time — and cached for 24 hours. - No account, no analytics, no tracking. The only network calls are to Amazon product pages and, if you buy a licence, to the licence server to check your key. Free and Pro Free shows the full data strip on the first 5 results of every page. Pro is a one-time purchase — no subscription — and unlocks every result plus the summary bar. Enter your key once on the options page. About the estimates Sales estimates are derived from BSR using a US rank-to-sales curve, scaled down for smaller Amazon stores. They are estimates, not Amazon data; treat them as relative signals for comparing niches rather than exact figures. BookScope is not affiliated with Amazon or KDP.