Niche HoundLooking for a Publisher Rocket alternative?
Prices and features checked September 2026
Publisher Rocket and Niche Hound both help authors research books on Amazon, but they work in very different ways. Here’s an honest side-by-side, including the jobs where Publisher Rocket is the better pick.
The short version
Publisher Rocket is a paid research tool with keyword search-volume estimates, a category finder and Amazon Ads keyword tools, across 8 Amazon marketplaces. Niche Hound is a free Chrome extension that shows sales rank, estimated sales and royalties right under each book on Amazon.com search pages, with no separate app to open.
Side by side
| Niche Hound | Publisher Rocket | |
|---|---|---|
| Price | Free | $199 one-time, with a 30-day money-back guarantee |
| How you use it | Chrome extension. Search Amazon.com as normal and the details appear under each book automatically. | Downloadable app for Windows, Mac and Chromebook. You run searches inside the app. |
| Amazon marketplaces | Amazon.com only | 8: US, Canada, Australia, UK, Germany, France, Spain and Italy |
| Keyword ideas | Yes: real Amazon search suggestions, copy or download as CSV | Yes |
| Keyword search-volume estimates | No | Yes |
| Category finder | No | Yes, across 19,000+ categories |
| Amazon Ads keyword tools | No | Yes |
| Sales rank for every edition | Yes: Kindle, paperback and hardcover under each book | Competition analysis of top books |
| Estimated sales | Yes, as a range, added up across editions | Yes |
| Estimated author royalty | Yes, for independently published books, using KDP’s US rules | — |
| Indie vs traditional, Kindle Unlimited | Yes, per book and counted for the whole search | — |
| Niche summary | 0–100 opportunity score for each search | — |
“—” means we couldn’t confirm the feature from Publisher Rocket’s own website, not that it definitely isn’t there. Publisher Rocket details are from publisherrocket.com and its download page, checked September 2026.
Which one fits you?
Niche Hound is a good fit if you…
- want to size up a niche while browsing Amazon, without switching apps
- care what books actually earn authors, not just sales
- want to see whether indie or traditionally published books lead a niche
- publish on Amazon.com and don’t want to spend money yet
Publisher Rocket is the better pick if you…
- need keyword search-volume numbers
- want help choosing Amazon categories
- run Amazon Ads and need keyword lists for them
- sell in the UK, Germany or other marketplaces beyond Amazon.com
You don’t have to choose: a free extension for quick niche checks while you browse works fine alongside a dedicated tool for keywords, categories and ads.
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 Publisher Rocket, Kindlepreneur or Amazon. Publisher Rocket 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.