ISBNLab vs Prometiam

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

ISBNLab compared with Prometiam
Detail	ISBNLab	Prometiam
What it does	Book metadata database and API for searching, converting and using ISBN data	Official company registers via one REST API for 37 countries
Stage	Not given	Startup
Founded	Not given	2026
Based in	US	ES
Pricing model	Freemium	Free trial
Pricing	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.	14-day free trial with 500 credits (card required, nothing charged). Starter €9.99/month with 1,000 credits/month. Professional €29.99/month with 10,000 credits/month. Scale €99.99/month with 50,000 credits/month. Enterprise at custom price. Annual billing available: €99.90/year for Starter, €299.90
Key features	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	Company lookup and autocomplete across 37 countries Officers and directors where the register publishes them Corporate insolvency notices in 16 markets Sanctions screening and export-control screening Company financial statements where filed Company monitoring with webhooks VAT number validation Legal Entity Identifier (LEI) data Model Context Protocol (MCP) server
What makes it different	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	Official registry data from each country's authoritative source, with credit to the register Same response format for every country, no integration per country needed Published pricing with no sales call required Coverage gaps stated first on every feature page Free trial requires only a card, nothing charged for 14 days
Community votes	0	0
DR (Domain Rating by Ahrefs)	4 no change since last check	12 no change since last check
Trust Flow (Majestic)	1	13
Citation Flow (Majestic)	32	30
Referring domains (Majestic)	6	39

6 details filled in for both companies.

More alternatives to ISBNLab More alternatives to Prometiam