Publisher Rocket vs KDSPY for KDP publishers
Reviewed 2026-11-09 from both vendors' own pages. Neither vendor paid to be compared.
Publisher Rocket or KDSPY: which is better for KDP keyword and category research?
Both are one-time purchases for researching Amazon books. Publisher Rocket ($199) is a desktop app with keyword search, category search across 19,000+ categories, a competition analyzer and an Amazon Ads keyword generator. KDSPY ($79) is a browser extension that overlays category, keyword and revenue estimates on Amazon pages as you browse, with a longer 60-day refund window. Pick Rocket for structured research and ads; KDSPY for quick checks.
| Publisher Rocket | KDSPY | |
|---|---|---|
| Price | $199 one-time | $79 one-time |
| Pricing details | $199 one-time for lifetime access, shown as down from $299. 30-day money-back guarantee. Its page warns it may move to an annual subscription; check terms before buying. | $79 one-time plus tax, shown as down from a regular $197. Dual license for two devices. 60-day money-back guarantee. |
| Refund window | 30 days | 60 days |
| Runs on | Windows, Mac | Chrome extension, Firefox extension |
| Makes KDP-ready files | No | No |
| How you use it | Desktop app you search in | Extension that works on Amazon pages while you browse |
| Keyword research | Keyword search | Keyword analysis |
| Category research | Category search across Amazon's 19,000+ categories | Category breakdowns with estimated revenue and daily sales needed to rank |
| Competitors | Competition analyzer with rivals' sales and rankings | Author and publisher analysis |
| Amazon Ads | Amazon Ads keyword generator | Not on its feature list |
| Tracking | Not on its feature list | 30-day book tracking |
| Amazon stores | Eight | 13 (US, UK, CA, DE, AU, IT, ES, FR, IN, JP, MX, BR, PL) |
| Worth knowing | Made by the founder of Kindlepreneur, which also sells Atticus; its page warns it may move to a subscription | Sales and revenue figures are estimates; desktop browsers only |
| Listing last checked | 2026-11-09 | 2026-11-09 |
Choose Publisher Rocket if…
You want one place to search keywords and categories, size up competing books and build Amazon Ads keyword lists, and you work on Windows or Mac.
Choose KDSPY if…
You mostly want fast estimates while browsing Amazon itself, want to spend less up front, or want more stores and a 60-day refund window.
Sources
Prices change. Each side's figures come from its listing, which links the vendor page we checked. Report a change.