# BookBloom

> Free KDP toolkit with AI keyword research, banned keyword compliance checker, BSR calculator, and Chrome extension — all permanently free, no account required.

Source: https://selfpublishingdirectory.com/keywords-metadata/bookbloom
Website: https://www.bookbloom.io
Category: Keywords & Metadata (https://selfpublishingdirectory.com/keywords-metadata)
Pricing: free — $0
AI-powered: yes
Editor's pick: yes
Tags: free-tool, keyword-research, compliance-checker, bsr-calculator, ai-powered, chrome-extension, amazon-kdp, kdp
Last verified: 2026-05-14
Best For: New KDP authors generating compliant metadata for a first book at zero cost
Data Source: ai-generated, platform-guidelines
Platform: web, Chrome Extension
Tool Type: keyword-research

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.