BookScope is a Chrome extension that puts estimated sales and monthly revenue under every book on Amazon, so KDP niche research takes minutes instead of an afternoon of tab-hopping.
Add to ChromeFree for the first 5 results on every page. Coming to the Chrome Web Store shortly.
An Amazon search result, with BookScope installed:
Sourdough for Busy People: 40 no-knead loaves
by M. Halvorsen · Kindle Edition · 4.6 ★ (412) · Published Feb 2026
Page summary · 16 results · median $640 / mo · avg 210 reviews · 69% indie · Opportunity: High
What it does
Reads the rank, does the mathBest Sellers Rank, price, reviews and format are already on the page. BookScope turns them into sales per day and revenue per month using a published BSR-to-sales curve and Amazon's royalty rates.
Sizes up the whole nicheA summary bar at the top of each search or category page shows median revenue, average review count and how many titles are independently published, with a plain High / Medium / Low verdict — and the reasons: how much money is there, how entrenched the top books are, how crowded the results and ads are, how old the niche is. Sort by revenue, hide ads, copy a one-line summary to share.
Works where you already lookAmazon .com, .co.uk, .ca, .com.au, .de and .in. Kindle and print. No dashboard to log into, nothing leaves your browser except the Amazon pages you're already viewing.
$24
One-time payment. Unlimited results on every page, all supported stores, updates included. No subscription, no account.