KDSPY vs Publisher Rocket (2026): which should you pick?
As of Oct 23, 2026, KDSPY and Publisher Rocket share a 2.2 GPA, neither has a free plan and their prices can't be set side by side, so the choice depends on which platforms you need.
Checked Oct 23, 2026 · graded Oct 23, 2026 by ToolGPA
They get the same grade on all five counts.
Price, platforms and features side by side. The table says where each price was read and when.
KDSPY
Browser extension for Amazon book category and keyword research
From $79 one-time
Publisher Rocket
Amazon keyword, category and ad research for book authors
From $199 one-time
Which one is for you
Pick KDSPY if
- Fits if you self-publish and want sales estimates for a category before you pick a book topic
- Works for authors who research while browsing Amazon and would rather pay once
Look elsewhere if
- Not for you if you want to try it first, as there's no trial or free plan, only a 60-day money-back guarantee
- Skip it if you sell anywhere but Amazon, as its data covers 13 Amazon stores and nothing else
- Watch out: it doesn't work on iPads, tablets or phones, only as an extension in a desktop browser
- Tight if you work on more than two computers, as the license covers two devices you own
- Watch out: sales and revenue figures are its own estimates, and the $79 is shown cut from a crossed-out $197 with no end date
Pick Publisher Rocket if
- Fits if you self-publish on Amazon and need seven keywords and the right categories for a book
- Works for authors who'd rather pay once than keep a monthly plan
Look elsewhere if
- Not for you if you want to try it first, as there's no trial, only a 30-day money-back guarantee
- Skip it if you sell anywhere but Amazon, as it covers the US, UK, Canada, Australia, Germany, France, Spain and Italy stores only
- Tight if you switch between computers, as the license is for one device and moving means clearing the old activation
- Watch out: it doesn't run on iPads, tablets or phones, only on Mac, Windows and Chromebook
- Watch out: the $199 is shown cut from a crossed-out $299, with no end date
How we grade them
| 2.2GPAKDSPYFair | 2.2GPAPublisher RocketFair | |
|---|---|---|
| Value for money | A$79 once, with unlimited use and future updates, well under a year of this category's $17 middle subscription. The page shows it cut from a crossed-out $197, with no end date, and tax is added where it applies. | A$199 once for every feature, unlimited searches and free updates, just under a year of this category's $17 middle subscription. The page shows it cut from a crossed-out $299, with no end date. |
| Free plan and trial | FNothing is free: no free plan and no trial. A 60-day money-back guarantee is the only safety net, and that isn't a trial. | FNothing is free. There's no trial or free version, only a 30-day money-back guarantee, and that isn't a trial. |
| Features | CBreakdowns of 25,000+ Amazon book categories, sales needed to rank, keyword revenue and competition with A-Z suggestions, author lookups, 30-day rank tracking and ChatGPT prompts. It does Amazon book research fully, but that's a smaller job, and sales and revenue are its estimates. | CAmazon keyword and category search, rivals' sales, rankings and reviews, Reverse ASIN, an Amazon Ads keyword generator and the one-report Rocket Report. It does Amazon book research fully, but that's a smaller job, in eight Amazon stores only. |
| Ease of use | BNo rating on record. It's a browser extension that works on Amazon's own pages as you browse, with no accounts to connect. | BNo rating on record. It's a program you install and search from, with no accounts to connect. Moving to a new computer means clearing the old activation first. |
| Platforms and integrations | CAn extension for Chrome, Firefox, Edge, Opera and Brave on a computer, and the site says it doesn't work on iPads, tablets or phones. Its only link elsewhere is prompts it builds for ChatGPT. | CMac, Windows and Chromebook, with no web, iPad or phone version and no integrations on record. A program for computers alone sits here however many systems it runs on. |
| Best for | Amazon book research while you browse the store | Amazon keywords and categories for book authors |
The GPA is the average of the five grades: an A is 4 points, an F is none. The full reasons are on each tool's page: KDSPY and Publisher Rocket. How we grade
Where they differ
In commonOne-time purchaseKeyword researchAmazon selling
At a glance
| KDSPY | Publisher Rocket | |
|---|---|---|
| Pricing | Paid | Paid |
| Starts at | $79 one-time, plus tax where it applies | $199 one-time, for lifetime access |
| Free plan | None | None |
| Free trial | None listed | None listed |
| macOS | ||
| Windows | ||
| Browser extension | ||
| Made by | LeadsClick Ltd (trading as Publishing Altitude) | Publisher Rocket, LLC |
| Price read from | kdspy.com | publisherrocket.com |
| Checked | Oct 23, 2026 | Oct 23, 2026 |
Worth knowing
KDSPY
- It runs only as a browser extension for Chrome, Firefox, Edge, Opera and Brave; the site says it does not work on iPads, tablets or phones.
- Data covers Amazon only: the US, UK, Canada, Germany, Australia, Italy, Spain, France, India, Japan, Mexico, Brazil and Poland stores.
- There is no free trial or free plan, only a 60-day money-back guarantee.
- The license covers up to two devices you own.
Publisher Rocket
- Covers Amazon only: the US, UK, Canada, Australia, Germany, France, Spain and Italy stores.
- It is downloadable software for Mac, Windows and Chromebook; the support page says it does not run on iPads, tablets or phones.
- The license allows installation on a single device, and moving to a new one means clearing the old activation.
- There is no free trial, only a 30-day money-back guarantee.
Key features
KDSPY
- Category analysis
- Breaks down any of Amazon's 25,000+ Kindle, book and audiobook categories, with each book's key figures and an estimate of what a first-page listing earns.
- Sales needed to rank
- Estimates how many copies a book has to sell in 24 hours to reach positions 1 to 20 in a category.
- Keyword analysis
- Gives a keyword's revenue potential, the number of competing books and how likely a new book is to rank, with A-Z suggestions that export for Amazon Ads.
- Author and publisher lookups
- Summarizes an author's page in one click, with sales rank and projected revenue for each Kindle, paperback, hardcover and audiobook edition.
- Book tracking
- Follows the daily sales rank of any number of books for 30 days and charts their estimated daily and monthly revenue.
- ChatGPT prompts
- KDSPY Insights builds prompts about a category, keyword or competing book to run in ChatGPT, across eleven report types.
Publisher Rocket
- Keyword Search
- Researches the phrases Amazon shoppers type to find books, aimed at picking a book's seven keywords, and flags ones Amazon may treat as against its guidelines.
- Category Search
- Searches Amazon's 19,000+ book categories to help choose where a book should be listed, with guidance on ghost and duplicate categories.
- Competition Analyzer
- Shows the sales, rankings and, since December 2025, the reviews of competing books and authors.
- Amazon Ads keyword generator
- Generates hundreds of keywords and related ASINs for Amazon Ads campaigns, and keeps saved results.
- Reverse ASIN
- Shows the keywords another book has been ranking for on Amazon. It was added in September 2024.
- Rocket Report
- Added in September 2026, it does the keyword and category research for a book in one report.
Plans
KDSPY
KDSPY Pro$79
one-time
Unlimited use, all future updates and a license for two devices. Shown as reduced from a crossed-out $197, with no end date.
Publisher Rocket
Lifetime Access$199
one-time
Every feature, unlimited keyword and category searches, and free updates. Shown as reduced from a crossed-out $299, with no end date.
Common questions
Which is cheaper, KDSPY or Publisher Rocket?
As of Oct 23, 2026, KDSPY starts at $79 one-time, plus tax where it applies, and Publisher Rocket starts at $199 one-time, for lifetime access.
Which has a free plan, KDSPY or Publisher Rocket?
As of Oct 23, 2026, neither KDSPY nor Publisher Rocket has a free plan.
Which platforms do KDSPY and Publisher Rocket run on?
As of Oct 23, 2026, only KDSPY lists a browser extension and only Publisher Rocket lists macOS and Windows apps. A platform missing from a listing is one its maker's pages did not mention.
More comparisons
How this page was made
- The verdict at the top follows a fixed rule. When both tools are in the same category and either is in our top three for it, the verdict follows that ranking: the higher-placed tool is our pick. The top three weigh who each tool suits as well as its grades, so a pick can go against the GPA. Otherwise the page does not pick one and says which grades higher: the higher GPA first; on a tie, the one with a free plan, then the one that starts cheaper in dollars a month, counted the same way for both; if they are still level, what the choice depends on.
- The grades are our own, from each tool’s review or report card. The GPA is their average.
- Prices, plans and platforms come from each tool’s listing. The table above says where each price was read and when.
- The differences and the answers to the questions are worked out from those listings.