BookBloom

BookBloom is a free toolkit built specifically for Amazon KDP authors, covering keyword research, compliance checking, royalty calculation, and browser-side data access. Its defining feature is a banned keyword compliance checker that screens metadata against Amazon's prohibited keyword list before authors submit — catching violations before they trigger account warnings or suspensions.

What You Get#

• AI Keyword Research: Generates 20 SEO-optimized keywords per session using Claude AI, with each keyword automatically screened for Amazon guideline compliance — banned terms, trademark violations, and unverifiable claims are flagged before they reach the KDP dashboard
• Metadata Compliance Checker: Paste any title, subtitle, or keyword string to scan for policy violations; catches prohibited terms including brand names ("Amazon," "Kindle," "Audible"), unverifiable superlatives ("bestseller," "#1"), and other restricted claims
• BSR to Sales Calculator: Converts a book's Best Sellers Rank into estimated daily and monthly sales figures, useful for sizing a competitor's sales velocity from the category page
• Print Cost Calculator: Computes printing expenses and author royalties for KDP paperbacks based on page count, trim size, and market
• KENP Calculator: Estimates Kindle Unlimited earnings from page reads, useful for comparing KU revenue against direct sales projections
• Pen Name Generator: AI-generated pen name suggestions across genres
• Chrome Extension: Provides instant BSR-to-sales estimates on any Amazon book page, one-click compliance checks from the KDP dashboard, and auto-populated calculator fields; rated 4.8/5 by 10,000+ authors

Who It's For#

• New KDP authors: The compliance checker addresses a gap most new authors don't know exists — Amazon can restrict accounts for metadata violations, and most authors only discover this after the fact
• Prolific KDP publishers: Authors who update metadata frequently benefit from scanning every update before it goes live
• Kindle Unlimited authors: The KENP calculator helps model whether KU enrollment makes financial sense for a given title

Pricing: 100% free. All tools and the Chrome extension are permanently free with no subscription required. The only paid product is a KDP Compliance & Risk Protection System Bundle — a 112-page PDF guide at $47 — which is educational content, not a software subscription.

Strengths#

• Compliance screening before submission: No other free tool proactively checks keywords against Amazon's prohibited list; the cost of not having this is a potential account restriction or suspension
• Claude AI integration: Keyword suggestions are generated by an LLM with awareness of Amazon guidelines rather than scraped from autocomplete data alone, providing both relevance and compliance in one step
• No account required for most tools: The web-based tools are accessible without signup; only the Chrome extension requires account creation

Limitations#

• 20 keywords per session cap: The AI keyword research tool generates 20 terms per request — adequate for individual books but limiting for bulk projects across many titles
• Amazon-only scope: All tools are built exclusively around Amazon KDP; useful for Kindle and KDP Print, irrelevant for Kobo, Draft2Digital, or other platforms
• No live search volume data: Keywords are generated by AI rather than pulled from live Amazon search databases; compliance checking is reliable but volume estimates are approximations
• No competitor ASIN lookup: Unlike Publisher Rocket or Helium 10, there is no reverse ASIN search to discover what keywords competitor books actually rank for

Alternatives#

Publisher Rocket ($199 one-time) provides live Amazon search volume data, competitor keyword lookup, and category analysis — the full data picture that BookBloom's AI estimates. For authors who want pure compliance coverage without paying for a full platform, BookBloom is the natural starting point before upgrading.