Reference
Ex Libris Lookup | Dewey Decimal Book Finder
Find any book's Dewey number instantly.
Ex Libris Lookup lets you search any book title or author to instantly retrieve its Dewey Decimal Classification number, ISBN, and publisher — and save books to a personal library stored on your device.
What you can do
Instant Dewey lookup
Search a title or author and get the Dewey Decimal number right away.
ISBN & publisher details
See the ISBN and publisher alongside each result for quick reference.
Personal library
Save books to your own on-device library for later.
Fast and focused
A simple, purpose-built tool for librarians, teachers, and book lovers.
Privacy by design
Your saved library lives on your device — no account, no cloud.
No data is collected about your searches.
Delete your library entries anytime.
Ready to try Ex Libris Lookup?
Download it today — no account required, your data stays on your device.
Download on the App Store