KDSPY review (2026): is it worth $79?
Browser extension for Amazon book category and keyword research
KDSPY report card
Fair · out of 4.0 · graded Oct 23, 2026
Best for Amazon book research while you browse the store
KDSPY is a browser extension that estimates the sales and revenue behind Amazon book categories, keywords and authors as you browse the store, and tracks the sales rank of books you pick, for $79 once. But the sales figures are its own estimates, it covers Amazon only, it runs only in a desktop browser, and there's no trial, just a 60-day refund.
Who KDSPY is for
- 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
Who KDSPY is not for
- 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
Why KDSPY gets a 2.2
Five grades, each with its reason. The GPA is their average: an A is 4 points, an F is none.
- AValue for money$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.
- FFree plan and trialNothing 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.
- CFeaturesBreakdowns 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.
- BEase of useNo rating on record. It's a browser extension that works on Amazon's own pages as you browse, with no accounts to connect.
- CPlatforms and integrationsAn 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.
What these grades rest on. Graded from this listing, whose facts were read from KDSPY's own pages on 23 October 2026. Not based on using the product, and shorter than our full reviews. How we review and grade.
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<a href="https://toolgpa.com/tools/kdspy#review"><img src="https://toolgpa.com/badge/kdspy.svg" alt="KDSPY: 2.2 GPA on ToolGPA" width="196" height="56"></a>Where KDSPY stands among keyword research tools
KDSPY's GPA of 2.2 is higher than 12 of the 51 other keyword research tools we grade, and level with 10.
It stands best on value for money (A, above 37 of 51) and worst on free plan and trial (F, above 0).
Each grade against the category
Every bar is all 52 keyword research tools we grade, cut by the letter each got. KDSPY’s own letter is outlined.
- AValue for moneyAbove 37 of 51, level with 14
- FFree plan and trialAbove 0 of 51, level with 5
- CFeaturesAbove 6 of 51, level with 36
- BEase of useAbove 28 of 51, level with 23
- CPlatforms and integrationsAbove 0 of 51, level with 25
Keep KDSPY, or make your own?
Keep it
To replace KDSPY you would be making search volumes for millions of keywords, gathered and kept up to date. That is not a weekend's work, with an AI app builder or without one.
That makes this kind of software worth paying for, not this one in particular: 29 of the 51 other keyword research tools grade higher. It costs $79, paid once.
What you could not
- Search volumes for millions of keywords, gathered and kept up to date.
- Data from Amazon's seller tools and years of sales estimates.
What this rests on. KDSPY’s listing: what it does, where it runs, what it plugs into and what it costs. It is a judgement about the kind of software this is. We have not built a replacement for it, and making your own means looking after it too. How we decide, and every tool’s verdict.
What is KDSPY?
KDSPY, once called Kindle Spy, is a browser extension that analyzes Amazon's Kindle, print and audiobook listings while you browse the store. It estimates the sales and revenue behind a category, a keyword or an author's books, suggests related keywords, and tracks the sales rank of chosen books. It is sold for a single payment.
Worth knowing
- 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.
Key features
- 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.
KDSPY pricing
As of Oct 23, 2026, KDSPY is a paid product, starting at $79 one-time, plus tax where it applies.
- Starts at
- $79 one-time, plus tax where it applies
- Free plan
- None
- Free trial
- None listed
| Plan | Price | What you get |
|---|---|---|
| KDSPY Pro | $79one-time | Unlimited use, all future updates and a license for two devices. Shown as reduced from a crossed-out $197, with no end date. |
Read from kdspy.com on Oct 23, 2026. Prices change, so confirm with KDSPY before you buy.
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Common questions
Does KDSPY have an Android app?
No Android app was listed when its pages were read on Oct 23, 2026. KDSPY is listed for no platform we could confirm.
Does KDSPY have an iPhone app?
No iPhone app was listed when its pages were read on Oct 23, 2026. KDSPY is listed for no platform we could confirm.
Is KDSPY open source?
KDSPY is not described as open source on its own site, as read on Oct 23, 2026.
Sources for this page
The prices, plans, platforms and features above were read from these pages on Oct 23, 2026.