Fihrist Lab is better for immediate book-level investigation, autocomplete discovery, organic keyword proof, complaint mining, and tracking specific titles.
Live browser software versus curated Kindle market reports
Fihrist Lab vs K-Lytics
K-Lytics studies Kindle categories through recurring market databases and reports; Fihrist Lab lets a publisher interrogate a live niche, book, keyword, or category on demand.
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 hands-on research at the point of decision. K-Lytics suits publishers who value curated monthly category intelligence, trend context, and deep report coverage.
Fihrist Lab$19.99One-time payment
K-LyticsPremium $37/month; Elite $97/month or $497 for 18 months on current public offer pagesSubscription
Last verifiedAugust 5, 2026Official sources where available
Quick verdict
The useful answer is about fit.
K-Lytics can be better for strategic genre selection using its monthly databases, long-form reports, category heat maps, and deep category coverage.
Fihrist Lab answers a live research question; K-Lytics delivers a recurring market-research publication and database.
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 | K-Lytics |
|---|---|---|
| Price | $19.99 | Premium $37/month; Elite options from $97/month |
| Payment model | One-time license | Subscription |
| Refund policy | See Fihrist Lab refund policy | Not publicly confirmed |
| Niche research | Niche Ledger + Niche Analyzer | Monthly category databases, reports, heat maps, and genre research |
| Search-demand estimation | Modeled monthly range | Sales-rank and estimated-sales market indicators, not keyword search volume |
| Competition analysis | Organic, sponsored, format, category, and market-shaping books | Category size, changes, sales, pricing, and competitive intensity |
| Organic keyword verification | Yes — page-one checks excluding sponsored placements | Not publicly confirmed |
| Amazon autocomplete research | Yes — book-focused long-tail phrases | Not publicly confirmed |
| Review-gap analysis | Yes — Opportunity Gap | Not publicly confirmed |
| Category analysis | Yes — category mapping and rank positions | Core strength — hundreds to thousands of Kindle categories by tier |
| BSR tracking | Yes — with estimated sales, revenue, price, and category movement | Market samples over time; not individual-book tracker workflow |
| 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 | Downloads include reports/Excel on eligible plans |
| CSV export | Yes | Excel download available on Premium/Elite offers |
| Supported marketplaces | Amazon US, UK, Germany, and France | Primary public materials focus on the Kindle Store; exact marketplace scope not confirmed |
| Browser integration | Chrome extension used while browsing Amazon | No — member reports, database, and online tool |
| Intended audience | KDP publishers researching niches, keywords, competitors, and tracked books | Authors and publishers making strategic genre/category decisions |
Practical differences
What changes in a real publishing workflow?
Niche intelligence
K-Lytics is unusually strong at top-down category intelligence, sampling large numbers of titles and comparing category performance. Fihrist Lab works bottom-up from the live books and signals present in the niche you are considering now.
Keyword research
Fihrist Lab has the clearer direct keyword workflow through autocomplete and Keyword Spy. K-Lytics' public positioning is category and genre intelligence rather than long-tail query discovery.
Competition analysis
K-Lytics quantifies category size, trend, price, and competitive intensity across its database. Fihrist Lab shows which specific books and sponsored listings create that competition on the current result page.
Search-demand estimation
K-Lytics models category sales volume from sampled BSR data. Fihrist Lab estimates monthly keyword/niche demand as a range; the outputs answer different questions and can complement each other.
Review and opportunity analysis
Fihrist Lab includes complaint mining through Opportunity Gap. K-Lytics does not publicly advertise a comparable review-text workflow.
Tracking and monitoring
K-Lytics tracks market samples month to month. Fihrist Lab tracks the publisher's selected books and their BSR, estimated sales, price, revenue, and categories over time.
Pricing
K-Lytics is a recurring research service, beginning at a publicly advertised $37 per month for Premium. Fihrist Lab is a $19.99 one-time extension license.
Workflow and ease of use
K-Lytics rewards deliberate reading of reports and database comparisons. Fihrist Lab favors fast investigation while browsing Amazon and revisiting saved work in The Vault.
Privacy and local data
K-Lytics provides member-area data and downloadable material. Fihrist Lab stores the user's own research results locally and does not operate a research-data backend.
Best use cases
Use K-Lytics to compare categories and genre trends at portfolio level. Use Fihrist Lab to validate the live niche, competitors, keywords, complaints, and tracked books behind a specific publishing idea.
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
- $444 at $37/month Premium
- Three years
- $1,332 at $37/month Premium
Offer pages and included category depth vary. Confirm the checkout price before purchasing.
Decision guide
Who should choose each tool?
Choose Fihrist Lab if…
- You need live book-level research
- You want Amazon autocomplete and organic keyword checks
- You track specific books
- You want one-time pricing
Choose K-Lytics if…
- You prefer curated monthly market intelligence
- You need deep category databases and heat maps
- You want top-down genre strategy
- You value specialist reports and member education
Questions publishers ask
Fihrist Lab vs K-Lytics FAQ
01Is Fihrist Lab a good K-Lytics alternative?
It can be, especially for publishers who want research inside Amazon, local research storage, and a $19.99 one-time license. K-Lytics 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. K-Lytics 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 K-Lytics be used together?
Yes. They do not need to be mutually exclusive. A publisher can use K-Lytics for its strongest specialist workflow and Fihrist Lab for browser-based market inspection, review gaps, organic verification, and local tracking.
07Can Fihrist Lab replace K-Lytics reports?
Not completely. Fihrist Lab is live, bottom-up research; K-Lytics provides curated top-down market datasets and commentary. The better choice depends on the decision being made.
Evidence before effort