Book Bolt
KDP-oriented research and production suite popular with low-content and niche paperback publishers: keyword and product research, Amazon search-volume style data, a browser Spy overlay, plus cover/interior design helpers…
Ads & keyword research
Amazon keyword, category, and ads research tools used by working indie authors.
6 tools
BookBub
Reader discovery network used by indie authors for Featured Deals (editorially selected discounted-ebook emails), self-serve BookBub Ads (CPC or CPM auction), and free tools such as Author Profiles and New Release Alerts…
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
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.
The Fussy Librarian
Genre-matched ebook promotion newsletter: readers pick the genres they want and get daily free or bargain picks. The official site lists about 570,000 free-ebook subscribers and around 125,000 bargain readers. Free promo…
Written Word Media
Ebook promotion company behind five reader newsletters: Freebooksy (free ebooks), Bargain Booksy (US$0.99–US$5 deals), Red Feather Romance (romance only), NewInBooks (new releases) and Audio Thicket (audiobooks). The off…