The KDSPY Insider’s Guide
Everything we know about KDSPY in one document: what it costs, its grades, getting a refund, getting help and what else to look at. Read it here, or keep a copy.
KDSPY
The Insider’s Guide
Browser extension for Amazon book category and keyword research
Every plan, grade, refund rule and rival among keyword research tools, read from KDSPY’s own pages.
Made by LeadsClick Ltd (trading as Publishing Altitude) · checked Oct 23, 2026 · toolgpa.com
Contents
- 01WelcomeWhat it is, who it suits, its grades and the ten things to know first
- 02What it costsEvery plan, the free plan, ways to pay less and how prices have moved
- 03What it doesIts main features, where it runs, what it works with and who makes it
- 04Where it standsIts grades against its category, and whether to keep it or make your own
- 05The alternativesThe tools it is most often weighed against, side by side
- 06Quick answersThe questions people ask about it, each answered in a line or two
- 07About ToolGPAWho made this guide, what else is on the site, and how to cite it
ToolGPA put this guide together from KDSPY’s own pages, its app-store listings and our grades. Every fact in it is on KDSPY’s page too, where it is kept up to date. Checked Oct 23, 2026.
Part 01 · Overview
Welcome
What it is, who it suits, its grades and the ten things to know first
2.2
GPA, above 12 of the 51 other keyword research tools we grade
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.
To get you started, here are 7 things to know about KDSPY, taken from its own pages and our grades.
It's a browser extension that works on Amazon's own pages as you browse, with no accounts to connect.
- 1
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.
- 2
What it costs
Paid plans start at $79 one-time, plus tax where it applies.
- 3
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.
- 4
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.
- 5
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.
- 6
A 2.2 GPA, above 12 of 51
That is against the other keyword research tools we grade, on value, the free plan, features, ease of use and platforms.
- 7
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.
KDSPY at a glance
- Pricing
- Paid, from $79 one-time, plus tax where it applies
- Free plan
- No
- Free trial
- None stated
- Runs on
- Browser extension
- Made by
- LeadsClick Ltd (trading as Publishing Altitude), since 2014
- Category
- Keyword Research Tools
- Our grade
- 2.2 GPA, fair
The report card
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.
| Subject | Grade | Comment |
|---|---|---|
| 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. |
| Free plan and trial | F | Nothing 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. |
| Features | C | Breakdowns 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. |
| Ease of use | B | No rating on record. It's a browser extension that works on Amazon's own pages as you browse, with no accounts to connect. |
| Platforms and integrations | C | An 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. |
An A is worth 4 points, a B 3, a C 2, a D 1 and an F nothing. The GPA is the average of the five.
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 it 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
Good to know
Good for
- Self-published authors choosing a book topic, category or keywords
- Authors who want to research while browsing Amazon itself
- Buyers who prefer one payment to a subscription
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.
Part 02 · Pricing
What it costs
Every plan, the free plan, ways to pay less and how prices have moved
$79 one-time
To start
KDSPY is a paid product, starting at $79 one-time, plus tax where it applies.
Nothing is free: no free plan and no trial.
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.
Read from kdspy.com on Oct 23, 2026.
Part 03 · Features
What it does
Its main features, where it runs, what it works with and who makes it
1
Place it runs: Browser extension
Browser extension for Amazon book category and keyword research. Here is what it does, as its own site describes it, and what it covers: one-time purchase, keyword research, amazon selling.
It does Amazon book research fully, but that's a smaller job, and sales and revenue are its estimates.
- 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.
Where it runs
- Browser extension
What it works with
- ChatGPT
KDSPY is made by LeadsClick Ltd (trading as Publishing Altitude), and has been around since 2014.
Part 04 · Standing
Where it stands
Its grades against its category, and whether to keep it or make your own
12/51
Other keyword research tools it is graded above
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
- FFree plan and trialAbove 0 of 51
- CFeaturesAbove 6 of 51
- BEase of useAbove 28 of 51
- CPlatforms and integrationsAbove 0 of 51
Keep it, or make your own?
Whether this is something you could build for yourself with an AI app builder, and what you would give up.
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.
Part 05 · Alternatives
The alternatives
The tools it is most often weighed against, side by side
Publisher Rocket, MerchantWords and Helium 10
The 3 tools KDSPY is most often weighed against, with where each one differs from it.
- 2.2GPA
Publisher Rocket
From $199 one-time
Amazon keyword, category and ad research for book authors.
- Only KDSPY lists a browser extension.
- Only Publisher Rocket lists macOS and Windows apps.
- 2.0GPA
MerchantWords
From $35/mo
Amazon keyword research from searches made on Amazon marketplaces.
- Only KDSPY lists a browser extension.
- Only MerchantWords lists a web app.
- KDSPY can be bought with a one-time purchase.
- 2.4GPA
Helium 10
Free plan · from $99/mo
All-in-one Amazon seller suite for research, listings, ads and profits.
- Helium 10 has a free plan. KDSPY does not.
- Only Helium 10 lists a web app.
- KDSPY can be bought with a one-time purchase.
Part 06 · Questions
Quick answers
The questions people ask about it, each answered in a line or two
10
Questions, each answered in a line or two
The short version of everything above, for when you only need the answer. Each one is told in full in its part of the guide.
Is KDSPY free?
No. KDSPY is a paid product, starting at $79 one-time, plus tax where it applies.
How much does KDSPY cost?
KDSPY lists one plan. KDSPY Pro: $79 one-time.
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.
What does KDSPY integrate with?
KDSPY's listing names ChatGPT. A listing names up to eight integrations, so it may connect to more.
Who makes KDSPY?
KDSPY is made by LeadsClick Ltd (trading as Publishing Altitude). It dates from 2014.
What are the alternatives to KDSPY?
The closest alternatives to KDSPY in our directory are Publisher Rocket, MerchantWords and Helium 10.
How does KDSPY compare with other 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.
Could I make my own version of KDSPY?
To replace KDSPY you would be making search volumes for millions of keywords, gathered and kept up to date.
Where this guide comes from
The prices, plans, platforms and features were read from KDSPY’s own pages on Oct 23, 2026, and the grades were given on Oct 23, 2026. 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.
Every tool we list gets five grades, A to F, each with its reason, and a GPA that averages them. How each is decided is at toolgpa.com/grades. This guide is ToolGPA’s own work; it is not made, paid for or approved by LeadsClick Ltd (trading as Publishing Altitude). Prices change, so check kdspy.com before you buy.
Part 07 · About
About ToolGPA
Who made this guide, what else is on the site, and how to cite it
3,189
Tools graded, in 94 categories
ToolGPA grades software the way a school report grades a pupil: five subjects, a letter for each with the reason written beside it, and a GPA that averages them. Prices, plans and platforms are read from each maker’s own pages and dated, so you always know how fresh a figure is.
Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. Every tool on the site has a guide like this one, free to download and pass on. It all lives at toolgpa.com.
3,189
tools graded
94
categories
426
price changes on record
579
apps priced in 12 countries
What else is on toolgpa.com
- KDSPY, kept up to dateEverything in this guide, with prices and grades as they are todaytoolgpa.com/tools/kdspy
- How grades are givenThe rules behind every letter and every GPAtoolgpa.com/grades
- Value chartsWhat each tool costs against what it scores, for every categorytoolgpa.com/charts
- CompareAny two tools side by side, plan by plantoolgpa.com/compare
- Price changesEvery price rise and cut on record, each with its sourcetoolgpa.com/price-changes
- Prices by countryWhat apps cost on the App Store in 12 countriestoolgpa.com/prices-by-country
- Pay lessEvery public discount: yearly billing, students, nonprofitstoolgpa.com/save
- Keep or makeWhich tools are worth paying for, and which you could build yourselftoolgpa.com/keep-or-make
Scan for the live page
Prices and grades as they are today
Quoting this guide?
Please name ToolGPA and link to the live page, so readers can check the figures for themselves:
ToolGPA, "KDSPY: The Insider's Guide", checked Oct 23, 2026. https://toolgpa.com/tools/kdspy
Know someone choosing between keyword research tools?
Send them this guide: toolgpa.com/tools/kdspy/guide
ToolGPA elsewhere: youtube.com/@toolgpa
See our other guides
The best-graded keyword research tools after KDSPY, each with an Insider's Guide of its own.
- Keyword Research Tools Insider's GuideEvery one of the 52 keyword research tools we grade, compared
- another keyword tool Insider's GuideFree keyword generator with live Google Keyword Planner data3.0 GPA
- Google Trends Insider's GuideFree charts of relative Google search interest by time and place3.0 GPA
- Pinterest Trends Insider's GuideFree view of what people search and save on Pinterest, by region3.0 GPA
Choosing software? Every tool graded, every price dated.
Compare tools at toolgpa.com ›Everything in this guide is ToolGPA’s own summary of what KDSPY’s pages, its app-store listings and public reviews said on the dates shown. Grades are our judgement under the rules at toolgpa.com/grades. Every grade, review and ranking on ToolGPA is our own judgement. No company can pay for a grade or change one. KDSPY is a trademark of its owner, and this guide is not made, paid for or approved by LeadsClick Ltd (trading as Publishing Altitude). Prices and plans change: check kdspy.com before you buy.