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Captapi vs ISBNLab

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

Captapi compared with ISBNLab
DetailCaptapi logo Captapi ISBNLab
What it doesOne REST API for structured data from 33 social platforms Book metadata database and API for searching, converting and using ISBN data
StageNot given Not given
FoundedNot given Not given
Based inNot given US
Pricing modelFreemium Freemium
PricingFree: 100 lifetime credits, 40 requests/minute. Starter: $9/month with 2,000 monthly credits, 120 requests/minute. Pro: $27/month with 6,000 monthly credits, 300 requests/minute. Business: $90/month with 20,000 monthly credits, 600 requests/minute. All plans include access to all 179 APIs. Credits d 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
  • Transcripts and AI summaries powered by GPT-4o-mini
  • Comments, replies, and profile statistics
  • Keyword, hashtag, and user search across platforms
  • Structured JSON responses without HTML parsing
  • MCP server for AI agents like Claude and Cursor
  • Official CLI and TypeScript SDK
  • HMAC-signed webhooks for monitoring and alerts
  • Automatic metric history time series
  • Batch endpoint for up to 20 calls per request
  • 24-hour shared cache with optional free cache hits
  • 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
  • One API key works across 33 platforms with 179 endpoints instead of separate SDKs and OAuth flows
  • No OAuth or per-platform API keys required
  • Pay only for successful data extraction, not for failed requests or cache hits
  • Cross-platform analytics with normalized metrics in one consistent format
  • 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)31 −1 (down) since last check4 no change since last check
Trust Flow (Majestic)121
Citation Flow (Majestic)3832
Referring domains (Majestic)2636

5 details filled in for both companies.

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