Last Software Update: 15th August, 2019.

Power Tools for Authors

Revenue metrics, keywords, competitor research, book tracking, and more at your fingertips – all in your favourite browser.


RISK-FREE – 60-Day 'No Questions' Money-Back Guarantee



"It's The Only Software Tool We Use And Recommend For Niche & Keyword Research"

– Mikkelsen Twins (Kindle Publishers)


Why do over 21,648 fiction & non-fiction

AND hundreds of bestselling NY Times & USA Today – authors use KDSPY v5?

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

After 5 years, 224 updates & lots of hair loss, now....

Introducing KDSPY v5

The fast & fun way to do book and competitor research...

PC Compatible

Mac Compatible

Firefox Compatible

Chrome Compatible

Instant Download.

Integrates directly into your Chrome or Firefox Browser.

Reverse engineer the 'bestseller' categories with a single click

When you want a detailed breakdown of any Kindle or Book category on Amazon, just click on KDSPY from within your browser, and in mere seconds, you'll know the competitor landscape of that category, the potential est. profit you could make there with a first-page listing – PLUS you'll have a detailed breakdown of each books performance.

Hover your mouse to see how many copies you need to sell to rank #1-20

Once you've identified an ideal category, a simple roll-over with your mouse on the red 'information' icon will reveal the est. DAILY sales you'll need for Amazon's algorithm to pay attention to your book – highlighting how to rank #1 and #20 in any given Kindle or Book category.

Another click shows you the most popular book trends in any category

What better way to find bestselling niches – and get ideas for your next book – than by modelling what's already working for other top authors. KDSPY shows you the hot trends in any market, reveals the bestselling niches to go after – and even gives you a world cloud to help you write a compelling book title.

Analyse keyword ranking potential with the search analysis feature

Do any keyword search in KDSPY itself and instantly get 100's of additional (A-Z) keyword suggestions – all exportable for AMS ads – along with competitor counts and their est. monthly revenue. It doesn't get any quicker than this to research keywords.

Spy on other published authors and model their bestselling books

KDSPY can analyse any author page and tell you in seconds all their statistics. Just a single click will show you the SalesRank of all their Kindle, Paperback & Hardcover books, their estimated sales, and total revenues broken down by individual book type.

Track your competitors book(s) performance over 30 days

Keep track of as many Kindle, Paperback & Hardcover books as you'd like with our book tracking feature. KDSPY pulls the SalesRank of your competitor's books and displays their rank in chart form along with their est. DAILY sales averaged out over the month. What better way to discover 'consistent' selling books & niche topics than by following sales performance over-time.

KDSPY supports data from 9 country specific Kindle stores on Amazon

That's right – even though you can use KDSPY from anywhere around the world ... KDSPY v5 also gives you "country-specific" data from Amazon stores in; USA, UK, Canada, Germany, Australia, Italy, Spain, France and India, too.

KDSPY v5 saves you valuable time – better spent on writing quality books

“KDSPY is hands-down the most valuable software I have right now for my kindle business. I have been publishing books on Amazon for since last fall, but things never really took off until I started using Kindle Spy. This software made it so easy for me to quickly see profitable niche markets in my areas of interest and now nearly every book I publish is a bestseller! In the next few months, I will be making enough money to finally quit my day job – yahoo!I actually use KDSPY for more than just finding profitable niches to write books on. I also use it to follow my own books. I use it to see, at a glance, how my own books are doing, so that I can gear my marketing efforts towards the ones that need it, and celebrate the ones that don’t. Honestly, as a publisher, writer, and business owner, KDSPY is the first thing I check every morning and the last thing I check every night.”

I am quite new to Kindle and found it quite difficult to understand how to do proper research and understand what categories to focus my energy in. KDSPY cuts out all the legwork and in a matter of seconds you get a complete and detailed spreadsheet with upto the minute average sales revenue, amazon best sellers rank, number of reviews and total revenue for your chosen niche. It's invaluable and certainly opened my eyes to the untapped potential awaiting kindle publishers. Another plus is the "word cloud" feature of the top keyword in the titles per niche. That alone is a goldmine and we all know the power of a popular eye catching title! However, despite all these features and benefits, Wesley's constant hands-on backup support in answering any queries I had about using KDSPY and his willingness to listen to feedback sets this product apart from others I have brought. If you are looking to grow and rapidly expand your Kindle publishing empire, KDSPY will get you there faster.

Try it RISK-FREE with our 60-Day Money Back Guarantee

Your purchase is 100% RISK–FREE!

We're so confident that KDSPY will save you time and make you more money that we offer a full 60-Day – no hoops to jump through – Money Back Guarantee.

Try it for yourself, and if you don't see the tremendous value it gives you in the first 60 days, simply let us know and we'll refund your money — no questions asked.

Join 21,648 Authors & Start Spying in Minutes


Regular Price $97 - Today ONLY $47

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Frequently Asked Questions

Still sitting on the fence? Here's answers to some of the most commonly asked questions...

Does KDSPY work on Mac and PC?

Yes. KDSPY is a browser extension that is compatible with both PC & Mac. And the good news is, installation takes less than 4 seconds no matter what computer you’re using – seriously!

Can the results be exported?

Yes. Absolutely. KDSPY will analyse all the Kindle, Paperback or Hardcover books in a category and give you an export of the results in under 29 seconds. But that’s not all. KDSPY will also allow you to export the word cloud, keyword results, author analysis and tracking data.

Does this work internationally?

Yes. KDSPY will work anywhere in the world to pull data from one of the support stores. Initially KDSPY was created to pull results from the largest Amazon marketplace; the US. However, due to popular demand, KDSPY v5 now supports results from specific stores in the UK, Canada, Germany, Australia, France, Italy, Spain, India and Japan. If I get enough requests, I will also consider adding other countries too.

Do I get future updates to KDSPY?

Yes. If you lock yourself in today for the insane price of just $47 (one-time) – that’s all you will ever pay. You will get ALL future fixes & feature updates to the software. And I plan on making a lot of improvements based on user feedback. Heck, we’ve made over 224 updates and rolled out over 20 advanced features since this was originally released in July 2014.

Does this work for fiction authors?

KDSPY was originally created for my own “non-fiction” publishing business as the main benefit comes from identifying patterns from the best sellers. However, being able to research multiple fiction categories 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.

Does this work on any browser?

KDSPY is programmed to work on Google Chrome and Mozilla Firefox. Due to the declining popularity of other browsers, it will unlikely be supported on any others in the future.

KDSPY v5 Software

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PC Compatible

Mac Compatible

Firefox Compatible

Chrome Compatible