KDSpy
Browser-based Amazon research overlay for category and sales-estimate style insights while you browse the store. Useful for quick competitive checks; always verify figures against your own sales data.
Publisher Rocket
What it is
Amazon keyword and category research for authors: estimate demand, inspect competition, and build keyword lists for metadata and Amazon Ads. One of the best-known paid research tools in the indie space.
Pricing model
Paid — One-time purchase desktop software. Always confirm on the vendor site before buying; plans change.
Regions
UK, Global
Affiliate
Affiliate status: affiliate pending — we only add tracked links after joining a free programme.
Honest note: IndieShelf blurbs are written from public positioning. We do not republish vendor marketing copy wholesale and we do not claim rankings we did not earn.