KDSPY Pro – Profitable Book Niches & Keywords in Less Time

Last Software Update: 12th May, 2026

Avoid Topic Paralysis

Here's how to decode Amazon's $516 billion "data goldmine" to see exactly which book ideas will sell — and which to avoid

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As featured in:

"Love the KDSPY software to help me see trends in the industry"

Love the KDSPY software to help me see trends in the industry, as well as verify how I am doing, in a snapshot graph, compared to other authors in my genre. I also use it when I'm contacted by authors I don't know, or when I want to learn about what successes others are having that I can learn from.

Sharon Hamilton

NY Times & USA Today Bestselling Fiction Author

"One of the best tools an author can have in their toolbox"

One of the best tools an author can have in their toolbox for finding the right category to get ranked in, identifying keywords and tracking your books and those of other authors for sales ranking!

Lise Cartwright

Author, Writer & Coach

Why do over 90,048+ fiction & non-fiction

– AND hundreds of WSJ, NY Times & USA Today – bestselling authors use KDSPY Pro?

Because many have grown their platform, book sales, and income by leveraging the research tools and competitor insights gained with KDSPY.

KDSPY sits in your browser as your book research assistant

Unlike isolated software applications buried on your computer, KDSPY sits in your browser and becomes your 24-hour on-demand research assistant when you're browsing Amazon.

Reverse engineer the bestseller categories
in a single click

When you want a detailed breakdown of any of the 25,000+ Kindle, book, or audiobook categories on Amazon, simply click on KDSPY from within your browser. Within seconds, you'll understand the competitive landscape of that category, the potential estimated profit from a first-page listing, and receive a detailed breakdown of each book's crucial metrics.

See how many books you need to sell in 24 hours to rank #1-20

To get Amazon's algorithm to notice your book, you need to sell a specific number of copies within 24 hours to secure a category ranking. After identifying an ideal category based on revenue potential, just hover over the red 'information' icon with your mouse, and get the estimated daily sales required to compete for a first-page position.

Discover the popular trends & keywords in any book category

What better way to find bestselling niches and get ideas for your next book than by modeling what's already working for other successful authors? KDSPY shows you the popular trends in any market, reveals the bestselling niches to go after, and even provides a word cloud to help you craft a compelling title.

Analyse keywords in-depth for profit and ranking potential

Perform any keyword search in KDSPY, and instantly receive its revenue potential along with hundreds of additional (A-Z) keyword suggestions—all exportable for AMS ads. You'll also get competitor counts and their estimated monthly revenue. Our keyword analysis feature delves even deeper, revealing the likelihood of ranking on Amazon for that keyword, too.

Spy on other authors & publishers and model their bestselling books

KDSPY evaluates any author's page, providing a comprehensive statistical overview in mere seconds. With just one click, you can view the sales rankings for their Kindle, paperback, hardcover, and audiobooks, and see projected sales and revenue categorized by each book format.

Track the sales rank & revenue of any book over 30 days

Monitor an unlimited number of Kindle, paperback, hardcover, and audiobooks with our book tracking tool. KDSPY retrieves the sales rank of your competitors' books every day, visually presenting their performance in charts, complemented by projections of their daily and monthly revenue.

Get cutting-edge AI insights into niches & keywords with ChatGPT

KDSPY Insights offers cutting-edge prompts tailored for AI, allowing you to effortlessly obtain keyword and target market insights with a single click through ChatGPT. Simply execute these sophisticated prompts on a book category, specific keyword, or a competitor's book to delve deeper and uncover unparalleled analysis and insights.

Supports data from 12 country specific Amazon Kindle stores

You can use KDSPY from anywhere in the world. Additionally, KDSPY Pro provides country-specific data from Amazon stores in the USA, UK, Canada, Germany, Australia, Italy, Spain, France, India, Japan, Mexico, Brazil, and Poland (just added).

How Rebecca Hamilton uses KDSPY in her author coaching practice

New York Times, USA Today, and Wall Street Journal bestselling author Rebecca Hamilton always had a knack for marketing. However, she used to spend countless hours on market research for herself and hundreds of her author clients.

Then she found KDSPY, which took out all the guesswork and freed up more time for her to focus on other areas of her career. Using KDSPY, she was able to help hundreds of her author clients hit the "New York Times" and "USA Today" bestseller lists.

Read her full story >

Get started now >

You're protected by our 60-day money-back guarantee

Browser Integration

KDSPY integrates directly into your browser. That means you can do your research right on Amazon, not with some lame software (that you'll forget about) buried on your computer.

Lightning Speed

KDSPY was painstakingly coded from the ground up to be the fastest book research tool on the market. Plus, the data that KDSPY reveals is available from a single click in your browser.

Single-Click Install

KDSPY installation is so simple a child could do it. In fact, it takes just one click and in 4 seconds, you’re done. And because it installs into the browser, it uses very little disk space.

"I’m launching a new illustrated kids book series in the next few months and I’m researching all my categories and keywords—as well as examining what other successful authors in my genre are doing—with KDSpy. So far, KDSpy is an incredible tool, far superior to KDP Rocket. There is no comparison."

– Mike Moreu, Childrens Book Illustrator & Author

"KDSPY is probably one of the most valuable tools an indie author can utilize. It’s exactly the app I needed to uncover all the info—accurate data, not guesses—on which subgenres sold well and why."

– C.S. Lakin, Novelist, Copyeditor & Writing Coach

"Wesley, Just wanted to let you know that KDSPY is my new favorite tool for Kindle research - it blows everything else away! It's lightning fast and super-simple to use. I've been using it the last few days..and all I can say is I wish I had this years ago. Great work!"

– Ed Lewis, Self Published Author

"This levels the playing field in so many ways. Now it's much easier to compete and create a product with more than an educated guess. My wife and I love KS4. It is easy to use and the pdf that goes with it could be sold as a product but it is free. Thanks!"

– Anthony Kollar, Self Published Author

Try It For 60 Days Before You Decide

Install KDSPY. Put it to work on a category, topic or keyword you're actually thinking about writing into. See the competition, the revenue, and exactly how many copies a day it takes to rank there. Run multiple keywords. Pull a competitor's real numbers. Do the research you'd want done before you commit months of your life to a book.

If it doesn't change how you pick your next topic ... email us any time inside 60 days and we'll refund the full $79. No hoops, no questions asked. (Most refunds are back in your account within 48 hours.)

So the only risk left is the one you already live with — writing your next book on a hunch, and hoping it sells.

Join 90,048+ self-published authors using KDSPY Pro

Get instant access to your unlimited KDSPY Pro account today for a "one-time" payment of ~~$197~~ just $79 (with zero monthly recurring fees). Once your payment is complete, you'll receive an email with installation and login details, along with tutorials, right away.

KDSPY Pro: Instant Access & Advanced Tutorials ($197 Value)

FREE Updates: We've rolled out over 412 updates since 2014

BONUS #1: The Book Publishing Cheatsheets ($141 Value)

BONUS #2: Create an Author Website Course ($197 Value)

BONUS #3: Book(s) ROI Tracking Spreadsheet ($27 Value)

BONUS #4: The Art of Niche Intelligence Course ($197 Value)

Total Value of $759 (Today: $79)

Your investment is risk free with our 60-day money-back guarantee.

Unlimited Use

Ongoing Updates

60-Day Guarantee

Regular Price $197– Today: $79

plus tax (if applicable)

ONE TIME PAYMENT

No Monthly Recurring Fees – Ever

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Got questions?

Here are answers to some of the most common questions we get about KDSPY.

Does KDSPY work on Mac and PC?

Yes. KDSPY is a browser extension compatible with both PC & Mac. And the good news is, installation takes less than 4 seconds no matter what computer you’re using – seriously!
(Note: KDSPY will not function on iPads, Tablets or Smartphones).

Can the results be exported?

Yes. Absolutely. KDSPY will analyse all the Kindle, Paperback or Hardcover books in any category, and give you an export of the results in under 29 seconds. KDSPY also provides an export of the word cloud, keyword results, author analysis and tracking data.

Does this work on any browser?

KDSPY will operate on Google Chrome, Mozilla Firefox, Microsoft Edge, Opera & the Brave browser – on an Apple, Windows, Chromebook or Linux system. Due to the declining popularity of other browsers, it will unlikely be supported on others in the future.

Can I install on multiple devices?

Yes. Your purchase comes with a DUAL license. Which means you can install KDSPY on up to two (2) devices that you own personally. Many people today use a desktop and a laptop, so we'd never ask you to purchase again to use KDSPY on an additional computer.

Do I get future updates to KDSPY?

Yes. If you lock yourself in today for the insane price of just $79 (one-time fee) – that’s all you will ever pay. You will get ALL future fixes & feature updates to the software. We take user feedback very seriously. In fact, we’ve made over 412 updates and rolled out over 20 advanced features since KDSPY was released in 2014.

Does this work for fiction authors?

KDSPY was originally created for my own "non-fiction" publishing business. However, being able to research multiple fiction categories, keywords and competitors with the speed of KDSPY – will save you countless hours of research time when trying to see which genres may be the most profitable to enter. It's why 65% of our customers are in fact, fiction authors.

Does this work internationally?

Yes. KDSPY will work anywhere in the world to pull data from one of the supported stores. Initially, KDSPY was created to pull results from the largest Amazon marketplace; the US. However, due to popular demand, KDSPY Pro now supports results from specific stores in the UK, Canada, Germany, Australia, France, Italy, Spain, India, Japan, Mexico & Brazil.