Best KDP keyword and niche research tools

For KDP keyword research, Publisher Rocket ($199 once, desktop app) and KDSpy ($79 once, browser extension) are the pay-once options; Book Bolt ($19.99 to $35.99 a month) and Self Publishing Titans ($20 to $90 a month) target low-content and coloring publishers and bundle book makers; BookBeam ($47 to $119 a month) has the deepest data, including USPTO and EUIPO trademark search. Start with Amazon's own search bar, which KDP itself recommends, before paying for any of them. None of these tools is ours.

Facts read on each tool's own pages, checked 2026-11-13. · Plain-text version

Quick picks

Pay once, desktop

Publisher Rocket

One $199 payment for keywords, categories and Amazon Ads keyword lists.

Cheapest paid

KDSpy

$79 once, with sales estimates shown while you browse Amazon.

Low-content and coloring

Self Publishing Titans

Free starter tools, then research plus coloring and puzzle book makers in one plan.

Deepest data

BookBeam

BSR history, tracking and USPTO/EUIPO trademark search for an established catalog.

Side by side

Tool	Price	Trial / free	Platform	Search volume	Trademark check	Low-content tools
Publisher Rocket	$199 once	No trial; 30-day refund	Desktop app (Windows, Mac, Chromebook)	Not documented	Not documented	Not documented
Book Bolt	$19.99 to $35.99/mo	3-day trial	Web app + Chrome extensions	Yes (Amazon and Google)	Not documented	Yes: designer, coloring, puzzles
KDSpy	$79 once	No trial; 60-day refund	Browser extension (Chrome, Firefox)	No (revenue potential instead)	Not documented	Not documented
Self Publishing Titans	$20 to $90/mo	3-day trial + free tools	Web apps + Chrome extensions	Yes (estimated)	Yes, beta (Publisher plan up)	Yes: coloring, low-content, puzzles
BookBeam	$47 to $119/mo	No trial; 7-day refund; free Lite extension	Web app + Chrome extension	Yes (estimated)	Yes (USPTO and EUIPO)	Partly (interior builder)
Amazon's search bar (free)	Free	Free	Amazon's website	No numbers	No	No

“Not documented” means the tool's own pages don't say it, not that the feature is missing.

Tool by tool

Publisher Rocket

Website ↗

Best for: Authors who want a pay-once desktop tool for KDP keywords, categories and Amazon Ads keyword lists instead of another subscription.

Price: One-time $199 (shown down from $299) with lifetime access and free updates. Its sales page warns it may move to an annual subscription, without a date.
Keywords: Keyword search for choosing your 7 KDP keywords; whether it shows a monthly search-volume number isn't stated on the pages we read.
Categories: Category search across more than 19,000 Amazon categories.
Competition: A Competition Analyzer with competing books' sales and rankings.
Amazon Ads: An AMS keyword generator for large ad keyword lists, plus a Reverse ASIN feature.
Marketplaces: 8 Amazon stores: US, UK, Germany, Australia, Spain, France, Canada, Italy.

Limits: Not a web app: no iPad, tablet or phone. The license is tied to a limited number of computers.

Sources (4)

Book Bolt

Website ↗

Best for: Low-content and puzzle publishers who want keyword research and a cover and interior designer in one subscription.

Price: Pro $23.99/month or $19.99/month billed yearly; Premium $35.99/month or $29.99/month billed yearly.
Keywords: Amazon and Google search volume, a difficulty score and estimated monthly sales per keyword; reverse lookup of a competitor's keywords.
Categories and niches: A KDP Category Finder with the sales needed to reach #1, niche research and a guided niche finder over 5M+ titles.
Sales data: Bestseller Tracker with BSR, price and review history.
Low-content: Book Bolt Studio builds covers, journals, planners, coloring and activity books, and generates sudoku, mazes, word search and crosswords.
Free: A royalty calculator without an account. Its browser extension is called “KDP Spy”, a different product from KDSpy.

Limits: Its pricing page gives two different monthly AI credit numbers for the same plans (3,000/5,000 on the cards, 1,000/4,000 in the table). Marketplaces covered aren't listed.

Sources (5)

KDSpy

Website ↗

Best for: Authors, especially of fiction, who want cheap one-time sales and revenue estimates on Amazon's pages while they browse.

Price: One-time $79 plus tax if applicable, no monthly fees, free updates. One license covers up to 2 personal devices.
Keywords: Revenue potential per keyword and A-Z suggestions; no search-volume figure documented.
Categories: Analysis across more than 25,000 Kindle, book and audiobook categories.
Sales data: Daily sales needed for page one, competitors' estimated monthly revenue, and 30-day rank tracking.
Marketplaces: Its page lists 13 Amazon stores (Poland marked new) while the headline says 12.

Limits: Only works while browsing Amazon on a desktop browser. Its page says most customers are fiction authors.

Sources (1)

https://www.kdspy.com/

Self Publishing Titans

Website ↗

Best for: Low-content and coloring publishers who want free starter tools first and, later, one plan that bundles research, trademark checks and book makers.

Price: Hobbyist $20/month ($180/year), Author $35 ($300), Publisher $60 ($540), Empire $90 ($780). Paid add-ons such as Hot Niches at $9/month.
Free: Category Finder, BSR Sales Calculator, Royalty Calculator, Cover Template Generator and a free keyword page, without a plan.
Keywords: The Titans Pro extension shows Amazon suggestions, estimated search volume and a demand and opportunity score; 300 to 600 searches a month by plan.
Research: Reverse ASIN, competitor niche research, trackers and the Trademark Checker (marked beta) start at the $60 Publisher plan.
Low-content: Coloring Book Maker, Low Content Book Maker and puzzle generators from the Author plan.

Limits: Card required for the trial and payments are non-refundable. The research tools need the Publisher plan or higher.

Sources (5)

BookBeam

Website ↗

Best for: Established publishers with a catalog who want deep data and trademark search and can justify a higher monthly price.

Price: Basic $47/month, Publisher $69/month, Publisher Pro $119/month (5 seats); quarterly and yearly billing also offered.
Keywords: Unlimited keyword research on all plans with demand, competition and estimated search volume; a Reverse Keyword tool.
Categories and niches: Category Explorer over 45,000+ categories with history, and a Niche Finder over 200M+ books (120 to 750 searches a month by plan).
Sales data: Sales and royalty estimates in the extension, BSR history and a Book Tracker.
Trademarks: A Trademark Checker that searches the USPTO and EUIPO databases.
Marketplaces: 7 Amazon stores: US, Canada, UK, Germany, France, Italy, Spain.

Limits: No free trial. History is limited to 1 year on Basic. Coloring-specific features aren't documented.

Sources (2)

Amazon's search bar (free)

Website ↗

Best for: Beginners validating a handful of keyword ideas at zero cost before deciding whether a paid tool is worth it.

How: KDP's own keyword help page suggests typing candidate keywords into Amazon's search and reviewing the drop-down suggestions, which reflect what shoppers type.
Rules: Up to 7 keywords or short phrases per book. KDP asks you to avoid repeating title or category words, subjective claims, misspellings, program names, HTML and quotation marks.
Trademarks: KDP warns against brands you don't own or aren't authorized to use, and against naming unrelated authors.

Limits: No search volume, competition or sales data: every check is manual.

Sources (1)

https://kdp.amazon.com/en_US/help/topic/G201298500

How we checked

We read each tool's own website, pricing page and feature pages on 2026-11-13, and the KDP help page for the free baseline. The URLs are listed under each tool.
When a page doesn't state something, we write “Not documented”. That means the page didn't say it, not that the feature is missing.
Prices are in USD as shown on each pricing page and can change. No tool paid to be included and none of them is ours.

Not included

KDP Wizard: kdpwizard.com is a parked domain, and the remaining browser listing describes a bookshelf backup tool, not keyword research.
Helium 10: A general Amazon-seller tool: its product and pricing pages don't mention books, KDP or authors, so we couldn't source any book-specific claim.

Spotted something out of date? Tell us at the address on the About page and we'll fix it.

Questions

›Do I need a paid keyword tool for KDP?

Not to start. KDP itself recommends checking keyword ideas in Amazon's search bar. A paid tool adds search-volume or sales estimates, category data and competition scores, which matter more once you publish regularly.

›Which KDP keyword tool has no monthly fee?

Publisher Rocket ($199 once, desktop app) and KDSpy ($79 once, browser extension) are one-time purchases according to their own pages.

›Which keyword tools help with coloring and low-content books?

Book Bolt and Self Publishing Titans both include coloring, low-content and puzzle book makers next to their research tools. BookBeam has an interior builder but doesn't document coloring-specific features.

›How many keywords can a KDP book have?

Seven keywords or short phrases per book, entered in the KDP details page.