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WebKnox vs ISBNLab

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

WebKnox compared with ISBNLab
DetailWebKnox logo WebKnox ISBNLab
What it doesAn API that turns chat questions into sourced, typed UI cards Book metadata database and API for searching, converting and using ISBN data
StageEstablished Not given
Founded2011 Not given
Based inDE US
Pricing modelFreemium Freemium
PricingFree: $0/month, 50 tokens a day. Starter: $9/month, 1,000 tokens a day. Pro: $49/month, 10,000 tokens a day. Scale: $199/month, 50,000 tokens a day. Token packs: 5,000 tokens for $10, 25,000 tokens for $40, 100,000 tokens for $120. Free: $0/mo with 1,000 Daily Calls; Standard: $5/mo with 5,000 Daily Calls; Pro: $15/mo with 15,000 Daily Calls. Custom plans available.
Key features
  • Card types for weather, nutrition, recipes, and comparisons
  • Integration with Vercel AI SDK
  • Web component for rendering answer cards
  • Source attribution for all answers
  • Pay only for matched answers, questions are free
  • No user conversation storage or message text logging
  • Versioned card schemas that never break existing code
  • Infrastructure running in Germany
  • REST and GraphQL API
  • ISBN validation and conversion
  • Multiple response formats: JSON-LD, JSON and CSV
  • OpenAPI and Swagger documentation
  • Official client libraries for PHP, Python, TypeScript/JavaScript and Go
  • Catalog of 102.1M book editions
  • Groups every edition of a book together
  • Comprehensive book data: ISBN-10, ISBN-13, EAN, ASIN, title, authors, publishers
  • Author information including names, birth and death dates, biography and photos
What makes it different
  • Rich, sourced answer cards instead of text
  • Model sees only text and sources, not the full card
  • User privacy by design with no message storage
  • Works with any AI SDK model that supports tool calling
  • One consistent schema for every book keyed by ISBN
  • Catalog of 102.1M book editions
  • ISBN validation and conversion for any valid ISBN, not just books in the catalog
  • Suitable for beginner, intermediate and advanced users
Community votes00
DR (Domain Rating by Ahrefs)12 +3 (up) since last check4 no change since last check
Trust Flow (Majestic)21
Citation Flow (Majestic)2332
Referring domains (Majestic)346

6 details filled in for both companies.

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