| What it does | Book metadata database and API for searching, converting and using ISBN data
| Create add-to-calendar links from your own code or let an AI assistant do it
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| Stage | Not given
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| Founded | Not given
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| Based in | US
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| Pricing model | Freemium
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| 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.
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| 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
| - Create events via REST API with details like name, date, time, timezone and location
- Generate shareable calendar links for each event
- MCP server integration with AI assistants like Claude
- List events with page views, calendar button clicks and RSVP counts
- Track RSVPs with accept and decline counts
- Add or remove event flyers from URL or base64
- Custom event links with personalized slugs
- Open source MCP package for local deployment
- Support for Google Calendar, Apple Calendar, Outlook and other calendar apps
- Rate limiting of 100 requests per 10 seconds per IP
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| 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
| - Built-in MCP server support for seamless AI assistant integration
- Open source option with tap2cal-mcp package for local deployment
- Multi-calendar support allowing guests to save to their preferred calendar app
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| Community votes | 0 | 0 |
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| DR (Domain Rating by Ahrefs) | 4 ● no change since last check | 6 ● no change since last check |
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| Trust Flow (Majestic) | 1 | 0 |
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| Citation Flow (Majestic) | 32 | 17 |
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| Referring domains (Majestic) | 6 | 4 |
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Tap2Cal