Look up a book's real ISBN and details
Ask about a book and Zeplik reads the real record from the Open Library catalog, then answers with the actual ISBN, first publication year, page count, publisher, author, and subjects. A language model cannot recall bibliographic details reliably: it will confidently produce an ISBN that fails its checksum, a wrong year, and an invented page count. This reads the live catalog record and, when a title cannot be found, says so instead of manufacturing a number.
The lookup is free; you pay only the normal cost of the answer, shown before you send.
How it works
Name the book
Ask in plain language, like 'what is the ISBN of The Pragmatic Programmer?' or give a title plus author, like 'Dune by Frank Herbert'.
Zeplik reads Open Library
It reads the live bibliographic record from the Open Library catalog, not the model's memory, and treats each field as source data.
Read the real record
The answer states the ISBN, first publication year, page count, and publisher exactly as the catalog holds them, so an ISBN actually checks out.
Worked examples
Real prompts you can open in the composer with the text ready to review. Nothing sends on its own. Swap in your own details.
Prompt: What is the ISBN of The Pragmatic Programmer?
Zeplik reads the live catalog record and returns a real ISBN, rather than an invented one that fails its checksum.
Open this in ZeplikPrompt: When was Dune by Frank Herbert first published, and who published it?
It reports the real first publication year and publisher from Open Library, not a year the model misremembered.
Open this in ZeplikPrompt: Show me the page count and publisher for Clean Code
It returns the catalog's median page count and publisher together, so the figures come from the record rather than a guess.
Open this in ZeplikWhat it can and cannot do
The lookup is precise about what it can verify and honest about its edges. Here is the plain posture.
Zeplik reads the live catalog record, so the ISBN is a real one from the catalog, not a plausible string that fails checksum.
It reads the earliest known publication year and the publisher from the record, so the bibliographic facts are the catalog's own.
Every lookup carries the median page count, authors, and subjects, so you see the full record rather than fragments from memory.
If the book cannot be found, Zeplik says so rather than inventing an ISBN or year to fill the answer.
A title can have many editions, each with its own ISBN. Zeplik returns a real catalog ISBN, but confirm the edition if you need one specific printing.
It reports bibliographic details, not the contents. It will not reproduce a copyrighted book, only its catalog record.
Grounded, and honest by default
- It cites the record's fields. Every answer states the ISBN, year, page count, and publisher from the catalog record, so nothing is vague or approximated from memory.
- It will not invent an ISBN. A language model fabricates ISBNs that fail checksum, so when a title is missing Zeplik says so rather than manufacturing a plausible number.
- Catalog data cannot hijack the answer. The bibliographic record is treated as untrusted content: Zeplik reads and reports it but never obeys instructions embedded inside a title or subject.
Frequently asked questions
- Where does the book data come from?
- From the Open Library catalog, read live and keyless. Each field Zeplik returns, the ISBN, first publication year, page count, and publisher, is the catalog's own record.
- Why not just ask a chatbot for a book's ISBN?
- Because a language model cannot recall ISBNs reliably and will produce one that fails its checksum. This tool reads the real catalog record instead.
- Which edition's ISBN do I get?
- A book can have many editions. Zeplik prefers a 13-digit ISBN from the catalog record; if you need one specific printing, confirm the edition when you cite it.
- What if two books share a title?
- Give the author along with the title to disambiguate. Zeplik returns the closest matches and puts the best match first, rather than guessing.
- Does a book lookup cost credits?
- The lookup itself is free. You pay only the normal model-token cost of the answer Zeplik writes around it, shown before you send, exactly like any other message.
Related skills
More on Zeplik
Cite the book, not a guess
Look up a book's real ISBN, first publication year, page count, and publisher, from the Open Library catalog, with an honest answer when a title is not found. Free to start.