Niche HoundLooking for a Book Bolt alternative?
Prices and features checked September 2026
Book Bolt and Niche Hound both help you research books on Amazon, but they’re built for different jobs. Book Bolt is an all-in-one publishing suite; Niche Hound is a free research extension. Here’s an honest side-by-side, including the jobs where Book Bolt is the better pick.
The short version
Book Bolt is a subscription suite with niche and keyword research (including Amazon search volume), a cover and interior designer, puzzle-book creators, AI tools and its KDP Spy extension. Niche Hound is a free Chrome extension that runs automatically on Amazon.com search pages and shows sales rank for every edition, estimated sales and estimated author royalties under each book.
Side by side
| Niche Hound | Book Bolt | |
|---|---|---|
| Price | Free | Subscription: Pro $19.99/month or Premium $29.99/month, billed yearly (more if paid monthly). 3-day free trial. |
| How you use it | Chrome extension. Search Amazon.com and the details appear under each book automatically. | Tools on the Book Bolt website, plus the KDP Spy extension: log in, search Amazon, then click the extension and press Start. |
| Amazon marketplaces for on-Amazon research | Amazon.com | Amazon.com (KDP Spy extension) |
| Estimated sales | Yes, as a range, added up across editions | Yes, with estimated revenue |
| Estimated author royalty | Yes, for independently published books, using KDP’s US royalty rules and printing costs | — |
| Sales rank for every edition | Yes: Kindle, paperback and hardcover under each book | Sales rank per result in KDP Spy |
| Keyword ideas | Yes: real Amazon search suggestions, copy or download as CSV | Yes |
| Keyword search volume | No | Yes |
| Niche database and trend tracking | No | Yes, 5M+ titles tracked |
| Cover and interior designer | No | Yes, including puzzle, crossword and sudoku tools |
| Indie vs traditional, Kindle Unlimited | Yes, per book and counted for the whole search | — |
| Niche summary | 0–100 opportunity score for each search | Competition scores on keyword ideas |
“—” means we couldn’t confirm the feature from Book Bolt’s own website or store listing, not that it definitely isn’t there. Book Bolt details are from bookbolt.io and the KDP Spy Chrome Web Store listing, checked September 2026.
Which one fits you?
Niche Hound is a good fit if you…
- mainly want to size up niches while browsing Amazon
- care what books earn authors after printing costs, not just revenue
- want to see whether indie or traditionally published books lead a niche
- don’t want a monthly subscription
Book Bolt is the better pick if you…
- make low-content books like journals, puzzles or coloring books and want the design tools
- need keyword search-volume numbers
- want a large niche database with trends
- prefer research, design and publishing prep in one place
You don’t have to choose: a free extension for quick niche checks while you browse works fine alongside a design and research suite.
A note on the numbers
Nobody outside Amazon sees real sales figures, so every research tool estimates them from sales rank. Niche Hound shows its estimates as ranges from two public models rather than a single precise-looking number. Treat any tool’s figures as a guide for comparing books, not a promise of income.
Try the numbers now. Estimate sales from any book’s rank with the free sales rank calculator, or check your earnings with the KDP royalty calculator.
Niche Hound: coming soon to the Chrome Web StoreNiche Hound is not affiliated with, endorsed by or sponsored by Book Bolt or Amazon. Book Bolt is a trademark of its owner. Amazon, Kindle and KDP are trademarks of Amazon.com, Inc. or its affiliates. Features and prices change; check each product’s website for the latest.