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ISBNLab vs apisapp

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 apisapp
Detail ISBNLabapisapp logo apisapp
What it doesBook metadata database and API for searching, converting and using ISBN data Your WhatsApp number, as an API
StageNot given Not given
FoundedNot given Not given
Based inUS IL
Pricing modelFreemium Paid
PricingFree: $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. $7.50 per WhatsApp number per month. First month free with code WHATSAPP100. No card needed. Billed monthly in advance. Includes text, media, polls, lists and buttons, webhooks for replies and deliveries, chats, contacts and message history.
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
  • Send text messages to any phone number or group with delivery status
  • Upload and send images, video and files
  • Create polls with 2 to 12 options and interactive menus
  • Receive webhooks for messages, deliveries, reads and connection changes
  • Query chats, contacts and past message history
  • Connect via HTTP API, Cloud MCP or Local MCP
  • Each number has its own replaceable API token
  • Number stays on your phone with no device to host
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
  • Multiple connection methods including cloud MCP for ChatGPT and Claude
  • Open-source local MCP server for self-hosted use
  • Fully separated numbers with no cross-data access between tokens
Community votes00
DR (Domain Rating by Ahrefs)4 no change since last check8 no change since last check
Trust Flow (Majestic)10
Citation Flow (Majestic)3216
Referring domains (Majestic)62

6 details filled in for both companies.

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