For Amazon KDP authors and publishers
Bad reviews.
Better book ideas.
Open a competing book on Amazon. BookGap reads its low-star reviews and writes the brief for the book those readers wanted.
5 analyses a day · No account or payment
Fictional sample · not live Amazon data
Pick a book.
Get the brief.
Five invented books, their invented low-star reviews, and the report BookGap would hand back.
BookGap report
Sample book
Low-star reviews · content only
Pick a book to begin.
Three steps.
One rule.
Open any Amazon book page.
Run BookGap on its one-, two-, and three-star reviews.
Write from the complaints, the gaps, and the brief.
Judges the book
Accuracy, depth, clarity, tone, structure, pacing, and missing explanations.
Ignores the box
Shipping, packaging, Amazon service, and damage in transit.
Free to explore.
5 analyses a day.
All three report sections are included in free early access. No account, license key, card, or subscription. Install BookGap and start with a book you want to understand.
- Included
- Reader complaints, unmet expectations, and a new book concept with a chapter outline.
- Analyses
- 5 a day in your browser, resetting at 00:00 UTC. Failed analyses do not use your daily allowance.
- Fair use
- The limit applies to your browser. Each internet connection also has a larger allowance of 50 a day, shared by everyone using it, so an office or a campus is not held to one person’s five. Service-wide safety limits may temporarily pause analyses.
- Early access
- Free while we develop BookGap. Any future paid offering would be announced separately and would require your explicit agreement.
Coming soon: BookGap is in review at the Chrome Web Store. For desktop Chrome 140 or later.
Questions, answered plainly.
Does it write the book?
No. It gives you research: what disappointed readers, what the category leaves open, and what a stronger book should cover.
Which reviews does it read?
One-, two-, and three-star reviews, where unmet expectations are stated most plainly.
Where does it work?
It is being built for multiple Amazon marketplaces, with an English-language interface.
Which browser does it need?
Google Chrome 140 or later, on a computer. It works in Chrome’s side panel while you browse Amazon.
Is everything really free?
Yes, during early access. Every report section is available, with 5 analyses a day. No payment details are collected and nothing turns into a paid subscription automatically.