Paper Library Checker

Zotero browser extension that flags papers already saved before you save again

Browser extensionfreeglobal

Paper Library Checker is a free, local-first browser extension that companion Zotero, showing whether the paper you're viewing on sites like CNKI or MDPI is already saved in your library — preventing duplicate items without sending any data off your device.

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Full match profile

Behind the summary, Matchbox keeps a richer profile of Paper Library Checker - the signals our matcher actually reads to decide when to surface it. It stays private; claim the listing to see and control it.

Problem & pain-point mapping
Who we surface it to (audience fit)
What it's a strong alternative to
Trust & credibility signals

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