Number 1: 
EarningsCall
Earnings call transcripts, audio, and data from 9,000+ public companies via API
- APIs & SDKs
- United States
- DR 32 no change since last check
APIs & SDKs · United States
ISBNLab
Book metadata database and API for searching, converting and using ISBN data
- Community votes
- 0
- DR by Ahrefs
- 4 no change since last check
Ahrefs Domain Rating benchmarked 12 Nov 2026, rebuilt 11 Nov 2026.
ISBNLab is a book metadata database and REST/GraphQL API that groups every edition of a book together and provides ISBN validation, conversion and detailed book
What it is
ISBNLab is a book metadata database and API service that keeps a catalog of 102.1M book editions and groups every edition of a book together, making it easy to find and compare different formats like hardcover, paperback and ebook versions of the same title.
The service provides both free ISBN tools on the website and a powerful REST and GraphQL API for developers. Through the API, developers can access titles, authors, publishers, subjects, ISBNs, publication dates, other editions and comprehensive book metadata. The platform includes ISBN validation and conversion tools, and supports multiple response formats including JSON-LD, JSON and CSV.
ISBNLab offers free and paid API plans designed to serve different use cases. Whether building a bookstore, library tool or reading app, the platform aims to make book data easy to search, convert and use. The service is suitable for students, professionals, book lovers, librarians, publishers and developers.
What it is built with
- 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
Pricing
Pricing model: Freemium
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.
Follow the workshop. Log in to follow ISBNLab's workshop
Following ISBNLab means an email when they reach a milestone, post an update or launch a new product.
ISBNLab metrics
| Metric | Value |
|---|---|
| Domain Rating | 4 no change since last check |
| Trust Flow | 1 no change since last check |
| Citation Flow | 32 no change since last check |
| Referring domains | 6 no change since last check |
| External backlinks | 2,307 no change since last check |
Ahrefs Domain Rating benchmarked 12 Nov 2026, rebuilt 11 Nov 2026. Main build topic: Business/Transportation and Logistics (1). Majestic benchmarked 11 Nov 2026, rebuilt 11 Nov 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
ISBNLab domain build sheet
Open the build sheet
| Domain age | 1 year |
|---|---|
| Registered | |
| Expires | |
| Registrar | Amazon Registrar, Inc. |
| DNSSEC | Not signed |
ISBNLab after-launch build log
Since ISBNLab launched on Maker Launches on 11 November 2026, these are the figures we have tracked.
- Domain Rating (Ahrefs)
- 4
- First measured 11 Nov 2026
- Trust Flow (Majestic)
- 1
- First measured 11 Nov 2026
- Referring domains (Majestic)
- 6
- First measured 11 Nov 2026
Day 0 since launch. Next receipt: day 30, 11 Dec 2026. We show what changed, not what caused it: many things affect these numbers. Nothing here is estimated.
Planning a launch?
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Questions from the bench
- Is there a free plan?
- Yes, a free account includes an API token with 1,000 calls a day to the Book and ISBN Tools APIs with no card needed. The website and ISBN tools are also free to use without an account.
- How do I use the API?
- Sign up for an API key, review the API documentation, integrate the API endpoints into your application, and make requests to fetch data such as Book Data, Publisher Data, Author Data, Series Data, and Edition Data.
- What data is available in the API?
- The API offers book data, publisher data, author data, series data, edition data and more including book titles, authors, publishers, subjects, identifiers and related information.
- How do I cancel a paid plan?
- Open your profile to manage billing or use your account at link.com. You can cancel at any time and your plan stays active until the end of the period you paid for.
- Who is ISBNLab for?
- ISBNLab is for all types of users including students, professionals, hobbyists, book lovers, collectors, librarians, publishers and developers seeking book information and tools.
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ISBNLab has a free listing. The owner can unlock the full profile with a paid launch for $5:
- Founder story (locked)
- Milestones (locked)
- Demo video (locked)
- Dofollow website link (locked)
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