Fihrist Lab is the focused choice for market intelligence, tracked evidence, and a low one-time cost.
Research intelligence versus a low-content design ecosystem
Fihrist Lab vs Book Bolt
Book Bolt combines KDP research with cover, interior, puzzle, and low-content creation; Fihrist Lab concentrates on reading market evidence before the book is built.
Fihrist Lab is the intelligence layer Amazon KDP publishers have been missing—built to expose real demand, decode the competition, and reveal exactly where the next book can win.
Fihrist Lab suits publishers prioritizing niche truth, organic visibility, review gaps, and tracking. Book Bolt suits creators who also need design and interior-production tools.
Fihrist Lab$19.99One-time payment
Book BoltNewbie $11.99/month or $119.88/year; Pro $23.99/month or $239.88/yearSubscription
Last verifiedAugust 5, 2026Official sources where available
Quick verdict
The useful answer is about fit.
Book Bolt is the more natural fit when creating covers, interiors, puzzles, or low-content books is as important as research.
Fihrist Lab helps decide what the market supports; Book Bolt extends farther into producing the book asset itself.
Side-by-side
Verified feature comparison
“Not publicly confirmed” means the capability or policy was not clearly documented in the official sources reviewed.
| Factor | Fihrist Lab | Book Bolt |
|---|---|---|
| Price | $19.99 | From $11.99/month or $119.88/year |
| Payment model | One-time license | Monthly or annual subscription |
| Refund policy | See Fihrist Lab refund policy | No refunds; three-day trial provided |
| Niche research | Niche Ledger + Niche Analyzer | Product and keyword research |
| Search-demand estimation | Modeled monthly range | Amazon search-volume metrics advertised |
| Competition analysis | Organic, sponsored, format, category, and market-shaping books | KDP Spy and product research |
| Organic keyword verification | Yes — page-one checks excluding sponsored placements | Not publicly confirmed |
| Amazon autocomplete research | Yes — book-focused long-tail phrases | Keyword research tools |
| Review-gap analysis | Yes — Opportunity Gap | Not publicly confirmed |
| Category analysis | Yes — category mapping and rank positions | Research tooling; exact current scope not publicly confirmed |
| BSR tracking | Yes — with estimated sales, revenue, price, and category movement | Not publicly confirmed on pricing page |
| Price and promotion detection | Yes — shopper-visible price and promotion awareness | Not publicly confirmed |
| Trademark-risk research | Yes — USPTO-based research aid; not legal advice | Not publicly confirmed |
| Local data storage | Yes — research is stored in extension storage | Not publicly confirmed |
| CSV export | Yes | Not publicly confirmed |
| Supported marketplaces | Amazon US, UK, Germany, and France | Not publicly confirmed on pricing page |
| Browser integration | Chrome extension used while browsing Amazon | Web software with KDP Spy workflow |
| Intended audience | KDP publishers researching niches, keywords, competitors, and tracked books | Low- and medium-content publishers needing research plus design/creation |
Practical differences
What changes in a real publishing workflow?
Niche intelligence
Book Bolt's research sits inside a production ecosystem. Fihrist Lab keeps the decision stage separate and evidence-led, mapping which listings genuinely shape a niche before creation begins.
Keyword research
Book Bolt includes keyword and search-volume tools. Fihrist Lab adds a verification step: a candidate phrase can be checked against organic page-one placement for a competing book.
Competition analysis
KDP Spy supports competitor research. Fihrist Lab adds sponsored-placement separation, format distribution, categories, review complaints, and a saved local record of the investigation.
Search-demand estimation
Both provide demand-oriented indicators. Fihrist Lab avoids a single exact search-volume claim and returns a credible monthly estimate range from observable signals.
Review and opportunity analysis
Opportunity Gap is a Fihrist-specific workflow for converting recurring low-star complaints into product requirements. No directly equivalent Book Bolt feature is confirmed on its public pricing page.
Tracking and monitoring
Fihrist Lab's Tracker is built for longitudinal BSR, sales, price, revenue, and category movement. Book Bolt's pricing page does not currently document equivalent ongoing monitoring.
Pricing
Book Bolt's lower tier costs $119.88 per year when billed annually. Fihrist Lab costs $19.99 once, but it does not include Book Bolt's design and puzzle-production suite.
Workflow and ease of use
Book Bolt can carry a low-content publisher from research into design. Fihrist Lab is strongest as the intelligence checkpoint before committing production time.
Privacy and local data
Fihrist Lab states that research remains in browser storage. Book Bolt's public pricing material does not establish a local-first data model.
Best use cases
Book Bolt is better aligned to low-content production. Fihrist Lab is better aligned to publishers who need to prove a niche, examine competitors, and monitor real books.
Inside Fihrist Lab
A connected evidence system—not ten disconnected numbers.
Niche Ledger
X-rays a niche to identify meaningful competitors, sponsored listings, format distribution, categories, and market-shaping books.
Niche Analyzer
Models credible monthly Amazon search demand as a range, making uncertainty visible instead of presenting a misleading exact number.
Keyword Lab + Keyword Spy
Discovers book-focused long-tail phrases through Amazon autocomplete, then verifies organic page-one rankings while excluding sponsored placements.
Opportunity Gap
Finds meaningful recurring complaints in competing books and turns those weaknesses into practical opportunities for a better book.
Category Analyzer
Maps categories and ranking positions associated with books and niches, preserving the context needed to judge category fit.
The Tracker
Monitors chronological BSR, estimated sales, shopper-visible price, estimated revenue, and category movement over time.
Promo-Aware Pricing
Detects the price shoppers can currently see so temporary promotions do not silently distort estimates.
The Vault
Saves research locally for later comparison and CSV export without sending the research history to a Fihrist server.
Trademark™ Check
Screens title phrases with USPTO results and publishing-risk signals. It is a research aid only—not legal advice, legal clearance, or a substitute for an attorney.
Cost of access
Pricing without distorted savings math
One payment. No subscription.
- One year
- $19.99
- Three years
- $19.99
Subscription
- One year
- $119.88 on annual Newbie
- Three years
- $359.64 on annual Newbie
Pro includes additional puzzle-generation capabilities. The official site offers a three-day trial and says purchases are non-refundable because of the trial.
Decision guide
Who should choose each tool?
Choose Fihrist Lab if…
- Your priority is market intelligence rather than interior creation
- You want review-gap analysis and longitudinal tracking
- You prefer a one-time $19.99 license
- You want research stored locally
Choose Book Bolt if…
- You create puzzles, activity books, or low-content interiors
- You need cover and interior design tools
- You want research and book production under one subscription
Questions publishers ask
Fihrist Lab vs Book Bolt FAQ
01Is Fihrist Lab a good Book Bolt alternative?
It can be, especially for publishers who want research inside Amazon, local research storage, and a $19.99 one-time license. Book Bolt may still be the better fit when its specialist workflow matches the job more closely.
02Which tool is better for KDP niche research?
Fihrist Lab is built for live, listing-level niche inspection: it separates sponsored from organic evidence, models demand as a range, and connects competitors, categories, reviews, and tracking. Book Bolt should be considered on the strength of its verified specialty described on this page.
03Does Fihrist Lab require a subscription?
No. Fihrist Lab costs $19.99 as a one-time payment for lifetime access to the current extension license, subject to its Terms of Service.
04Can Fihrist Lab estimate Amazon search demand?
Yes. Niche Analyzer produces a modeled monthly range from observable Amazon signals. It is an estimate from Fihrist Lab's model, not Amazon-reported search volume.
05Does Fihrist Lab verify organic keyword rankings?
Yes. Keyword Spy checks whether a competing book appears organically on page one for a phrase and excludes sponsored placements from that verification.
06Can Fihrist Lab and Book Bolt be used together?
Yes. They do not need to be mutually exclusive. A publisher can use Book Bolt for its strongest specialist workflow and Fihrist Lab for browser-based market inspection, review gaps, organic verification, and local tracking.
07Does Fihrist Lab design book interiors?
No. Fihrist Lab is a research and intelligence extension. Book Bolt is the better match when interior and cover production are required.
Evidence before effort