Reverse-Engineering Any Book with the ASIN Analyzer
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What You Can Learn from a Competitor's ASIN
Most KDP authors only look at their own book's data. The ASIN Analyzer lets you flip that around — enter any book's ASIN and see the data Amazon sees about it. Here's what each signal tells you:
BSR → Sales Volume
Their Best Sellers Rank tells you roughly how many copies they're selling per day. A BSR of #5,000 is roughly 10–50 daily sales.
Estimated Revenue
Monthly royalty estimate based on their BSR, price, and KU enrollment. Useful for deciding whether a niche is worth entering.
Review Velocity
How fast they're accumulating reviews. A book growing 50 reviews/month is gaining momentum. A book with 200 reviews but none recent may be stagnating.
Category Positioning
Which subcategories they're in. If they're in categories you're not, that's an opportunity — run Category Finder on their topic to find the same categories.
Keyword Targeting
What phrases their title and description target. Use this alongside Keyword Gap Map to find keyword opportunities you're missing.
How to Run an Analysis
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Go to the ASIN Analyzer tool page
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Enter any ASIN (e.g.
B0GJN8NTGB) or paste the full Amazon product page URL — the tool extracts the ASIN automatically -
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Click Analyze
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PublishRank pulls the book's current BSR, estimated monthly revenue, review count and velocity, category placements, and the keyword themes in their listing
You can analyze any book on Amazon — your own titles, competitors, or books in adjacent niches you're thinking about entering.
Using Compare Mode
Compare Mode lets you analyze up to 3 books side by side. To use it, check the "Compare Mode" checkbox before or after running your first analysis, then add a second and third ASIN.
The best use of Compare Mode: analyze your book + your 2 top competitors. The side-by-side view shows you exactly where the gap is:
- Your review count vs. theirs
- Your estimated revenue vs. theirs at their BSR
- Their category placements vs. yours
- Keyword theme differences between listings
This makes it immediately obvious which dimension to tackle first — reviews, listing quality, category positioning, or keyword coverage.
What to Do with the Results
Use the data you find to direct your next tool run:
Their review count is far higher than yours
Run Review Threshold Predictor on your ASIN to see the exact target for your category. Then focus your next 60 days on a review-building strategy.
Their BSR is much better despite similar review counts
The difference is likely keyword coverage — they're appearing in searches you're not. Run Keyword Gap Map on your ASIN to find which phrases they rank for that you don't.
They're placed in categories you're not in
Run Category Finder on their book topic to surface the same categories. Then email KDP support to request those categories for your book.
Their listing description or title is significantly more detailed
Run Listing Optimizer on your ASIN to audit your listing quality and see specific improvements.
Your Recent Analyses
Every analysis you run is saved automatically in the Recent Analyses table at the bottom of the tool page. Book covers are shown alongside each entry so you can quickly identify which book you're looking at.
You can re-analyze any previously analyzed book with one click to get fresh data. If a competitor's BSR has changed significantly since your last analysis, re-running gives you an updated picture of their current momentum.
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