Conservative matching
Smart mode checks DOI, then ISBN, then exact normalized title + first author + year. It never silently fuzzy-matches near titles.
For researchers, students, and evidence teams
Clean citation exports without uploading the library.
Combine BibTeX and RIS files, remove conservative high-confidence duplicates, inspect every match, and export a clean library from a private offline app.
Personal-use license · ZIP download after secure Stripe checkout · no subscription
10.1000/systematic-review.1KEEP
https://doi.org/10.1000/SYSTEMATIC-REVIEW.1DUPLICATE · DOI
Another Study · Lee · 2024KEEP
16automated tests passed
4export formats
0uploads or analytics
20,000record analysis limit
Free DOI duplicate checker
Spot duplicate DOI variants before merging files.
Paste one DOI per line. URLs, uppercase letters, and doi: prefixes are normalized locally in this page. Nothing is uploaded.
Paste DOI lines
Add DOI lines to begin.
Normalized unique DOIs
0valid lines
0unique DOIs
0duplicates
No results yet.
Inside the paid app
More than a DOI list checker.
The offline workspace reads full citation records and preserves an audit trail for each decision.
Inspect before export
Review match basis, duplicate count, source files, author, year, DOI, and retained record before downloading.
Four useful outputs
Export clean BibTeX, RIS, or CSL-JSON plus a CSV audit report. Filter by years and include or exclude terms.
Private by construction
The downloaded app has no accounts, uploads, analytics, external fonts, or cloud storage. Its security policy blocks network connections.
Local file support
Combine up to 20 pasted or file sources, 2 MB per file, and up to 20,000 combined records in one analysis.
Clear boundaries
This is a research-preparation utility. Keep backups and review every match before using results in evidence synthesis or high-stakes work.
Clean the full library offline.
Get the browser app, quick-start guide, personal-use license, and BibTeX/RIS/CSL-JSON/CSV exports.
Questions
Plain answers.
Does the app upload my citation library?
No. The purchased app runs from files on your device. It has no server calls or analytics, and its Content Security Policy blocks network connections.
What can it read and export?
It reads BibTeX and RIS. It exports BibTeX, RIS, CSL-JSON, and a CSV audit report.
Will it catch every possible duplicate?
No. The default is intentionally conservative and avoids fuzzy title matching. It finds high-confidence identifier or exact metadata matches; you should still review the audit and your original library.
Is it a systematic-review service?
No. It is a research-preparation utility, not a replacement for a documented review protocol, librarian, or expert judgment.
Can a lab or company share one purchase?
The $9 purchase covers one individual. Contact support for a team or institutional license.