KDP Spy

KDP Spy is a browser extenstion made by Book Bolt. Confused between KDSPY and KDP Spy? Learn how they differ, who they’re for, and which research tool fits your publishing strategy best. Both offer FREE trials.

KDSPY vs KDP Spy: What’s the Difference (and Why So Many Authors Get Confused)

If you’ve been researching Kindle keyword and category tools, you may have come across KDP Spy (KDPSPY) and KDSPY (also known as Kindle Spy) — and assumed they were the same thing. After all, the names are nearly identical.

But here’s the truth: they’re two completely different tools, created by two different companies, and understanding that difference can save you time, money, and frustration.

Let’s clear up the confusion once and for all.

KDP Spy

KDP Spy: A Chrome Extension by Book Bolt

KDP Spy is part of the Book Bolt ecosystem, which focuses on helping low- and no-content book publishers (like those creating journals, notebooks, and planners for Amazon KDP).

It’s a browser extension that works with the Book Bolt platform to help users quickly gather data from Amazon’s Kindle and book listings — things like:

• Book titles, prices, and estimated sales
• Best Seller Rank (BSR) data
• Competition levels in specific niches
• Keyword insights for low-content books
• KDP Spy is available through BookBolt.io
• Which One Should You Choose?
• It depends on your publishing goals:

If you’re creating low-content or no-content books, such as planners, puzzle books, or coloring books — KDP Spy (Book Bolt) is the better fit.

KDP Spy Free

Get a FREE KDP Spy trial by clicking the banner below

KDSPY

If you’re an author writing full-length books (fiction or nonfiction) and want to understand your niche, optimize your categories, and forecast sales — KDSPY is the tool you want. You can read more about how to avail of a KDSPY free trial or simply click the link below to start.

They’re not competitors so much as tools for different parts of the KDP publishing world.

KDP Spy vs KDSPY Comparison Table

Feature / Focus	KDP Spy (Book Bolt)	KDSPY (KDSPY.com)

Developer

BookBolt

KDSPY

Tool Type

Chrome Extension (with Book Bolt integration)

Standalone Browser Extension

Best For

Low-content publishers (journals, notebooks, planners)

Authors of full-length fiction & nonfiction

Main Features

Spy on listings, keyword and BSR data

Keyword & category analysis, revenue estimates

Platform Access

Requires Book Bolt account

Works independently

Price

Usually bundled with Book Bolt for a montly fee

One-time purchase (no monthly fees)

KDP Spy vs KDSPY FAQ

1. Are KDP Spy and KDSPY the same tool?
   No. Despite their similar names, they are created by different companies and serve different types of publishers.
2. Do I need Book Bolt to use KDSPY?
   No. KDSPY works independently and does not require a Book Bolt subscription or login.
3. Can I use both tools?
   Absolutely. Some users use both — KDSPY for niche/category analysis, and KDP Spy (via Book Bolt) for quick low-content listing research.
4. Which one is cheaper?
   KDP Spy is typically bundled with Book Bolt’s monthly plans, while KDSPY is a one-time purchase with free lifetime updates — so the long-term cost is usually lower with KDSPY.
5. Why do some videos or reviews get them mixed up?
   Because of the nearly identical names. Always double-check the website URL before buying or downloading — KDSPY.com and BookBolt.io are not the same company.

Conclusion

The KDP publishing space can be overwhelming enough without confusing tool names. Hopefully, this guide helps you see that KDSPY and KDP Spy aren’t rivals — they simply serve different needs within the same ecosystem.

When in doubt, remember:

BookBolt.io = KDP Spy (low-content focus)

KDSPY.com = KDSPY (full book market research)

Double-check the URL, pick the tool that matches your publishing strategy, and get back to what matters most — creating books that sell.