Paste any book's ASIN, yours or a competitor's, and Book Keyword Spy shows the Amazon search terms that book ranks for, with rank positions, monthly search volume, estimated traffic, and directional earnings potential.
Reverse-engineer what is already working, find the keywords competitors are winning, and spot the searches your own book could realistically target.
Most authors choose KDP keywords by guesswork.
They brainstorm a few phrases, fill the seven keyword boxes, and hope Amazon understands where the book belongs.
Meanwhile, the books outselling them may be ranking for dozens of Amazon search terms they have never considered: genre phrases, reader-intent keywords, trope searches, format-specific terms, niche angles, and long-tail searches that quietly send buyers to competing books every month.
Book Keyword Spy makes those keywords visible.
Paste an ASIN and see the search strategy behind the book: what it ranks for, how high it ranks, which keywords have demand, and where the best opportunities may be hiding.
Paste a rival book's ASIN and see the Amazon keywords it ranks for. Discover the search terms behind its visibility and use them to understand how readers are finding books like yours.
Run your own ASIN and see what your book is actually ranking for on Amazon. If only a handful of keywords appear, that is often a sign your listing is not giving Amazon enough clear relevance signals.
Book Keyword Spy automatically highlights useful opportunities, including Quick Wins where a book is close to stronger visibility and Grow keywords where demand exists but the current ranking is weak.
Instead of staring at a long keyword list, you can see which terms are worth protecting, improving, or adding to your next listing or ads strategy.
Enter your own book's ASIN or a competitor's ASIN, then choose the US or UK marketplace.
Get the book's ranked keywords, average position, monthly search volume, estimated traffic, earnings potential, and opportunity tags in one sortable report.
Choose the keywords worth targeting. Send them to the Keyword Rank Tracker, compare them in the Keyword Gap Finder, or work them into your title, subtitle, description, keyword boxes, and Amazon Ads.
Book Keyword Spy is designed to work with the rest of KDP Rank Fuel.
Use it to discover the keywords a book already ranks for. Then push those keywords to the Keyword Rank Tracker to monitor movement over time, or compare your ASIN against competitors in the Keyword Gap Finder to see where they rank and you do not.
You can also use the results to improve your KDP keyword boxes, strengthen your Amazon book listing, build Amazon Ads keyword lists, and identify niche search terms worth pursuing.
Explore the full KDP toolkit →Book Keyword Spy uses Amazon keyword and ranking data to show which search terms a book is appearing for, along with rank positions and monthly search volume.
Some numbers are estimates. Estimated traffic is calculated from keyword position and click-through modelling. Estimated earnings are calculated from estimated traffic, a conservative conversion assumption, royalty assumptions, and the book's price.
These figures are designed for comparison and prioritisation. They help you decide which Amazon keywords are worth attention, which competitor terms may be valuable, and which searches are unlikely to move the needle.
They are not guarantees of sales, royalties, or future ranking positions.
Instead of guessing, paste an ASIN and see the keyword profile behind the book.
You can create a free KDP Rank Fuel account to get started, and new accounts include starter credits. Because each lookup pulls keyword and ranking data, Book Keyword Spy uses credits. You can top up or upgrade only if you need more.
An ASIN, or Amazon Standard Identification Number, is Amazon's unique product identifier. For books, it is usually a 10-character code. Kindle ASINs often start with B0, while print editions may use a 10-digit ISBN-style identifier.
You can usually find the ASIN in the Amazon product URL or in the product details section of the book page.
Yes. Paste a competitor's ASIN to see the Amazon keywords that book ranks for. This helps you understand the keyword strategy behind competing books and identify search terms you may want to target in your own listing or ads.
Yes. Running your own ASIN shows what your book is actually ranking for on Amazon. If your book ranks for very few keywords, or only low-volume terms, that may indicate your title, subtitle, description, or KDP keyword boxes need work.
Keyword rankings and search volume are based on Amazon keyword data. Estimated traffic and estimated earnings are calculated from that data using modelling assumptions.
Use the rankings and search volume to understand visibility and demand. Use the traffic and earnings estimates as directional signals for comparing keywords, not as exact forecasts.
It depends on the book. A well-optimised bestseller may rank for a large number of keywords. A new, poorly positioned, or low-visibility book may only rank for a small set of terms.
If your own book has very few keyword results, that is useful information. It may mean Amazon does not yet have enough clear signals about where your book belongs.
LOW usually means the keyword has very low monthly search volume, or that estimated traffic and earnings are too small to be meaningful.
Low-volume keywords are not always worthless. Some niche terms have low competition and strong relevance. But they are unlikely to drive significant traffic on their own.
Protect means the book already ranks well for that keyword and the position may be worth monitoring or defending.
Quick Win means the book is close to stronger visibility, often just outside a more valuable ranking position.
Grow means the keyword may have demand, but the book is currently ranking too low to capture much traffic. These are terms you may want to strengthen through listing optimisation, ads, or rank tracking.
Estimated earnings are directional. They are calculated from estimated monthly traffic, a conservative conversion assumption, royalty assumptions, and the book's price.
The purpose is not to predict exact sales. It is to help you compare keywords and prioritise terms that may have more commercial value.
Book Keyword Spy supports Amazon.com and Amazon.co.uk. The same book can rank differently in each marketplace, so it is worth checking both if you sell in the US and UK.
Most keyword tools start with a phrase and give you related keyword ideas. Book Keyword Spy starts with a real book and shows the keywords that ASIN is already ranking for.
That makes it useful for competitor research, listing audits, Amazon Ads research, and keyword gap analysis.
Stop guessing at KDP keywords. Paste an ASIN and uncover the Amazon search terms behind the book's visibility, traffic, and sales potential.