Zotero is a free, open-source reference manager for collecting, organizing, and citing research, with optional paid cloud storage plans.
Category
Productivity
Pricing
Free forever for the core app and 300MB of cloud storage; optional paid Zotero Storage subscriptions billed annually add 2GB ($20/year), 6GB ($60/year), or unlimited ($120/year) of sync storage.
Zotero is a free and open-source personal research assistant built by the nonprofit Corporation for Digital Scholarship (originally developed at George Mason University's Roy Rosenzweig Center for History and New Media). It lets researchers, students, and academics automatically capture citations and source material while browsing academic databases, preprints, news sites, and library catalogs, then organize them into collections with tags and saved searches. Zotero generates citations and bibliographies in over 9,000 citation styles and inserts them directly into Microsoft Word, LibreOffice, or Google Docs. Desktop apps are available for Mac, Windows, and Linux, with companion apps for iOS and Android and browser connectors for capturing sources on the go. The core software and 300MB of cloud storage are free forever; ongoing development is funded in part by optional paid Zotero Storage subscriptions (2GB, 6GB, and unlimited tiers) that sync files across devices and let users share group libraries at no extra cost.
Key Features
Automatic research capture — Senses and saves research while you browse academic databases, preprints, news sites, and library catalogs.
Collections, tags & saved searches — Organize saved items into collections, apply keyword tags, and build automated saved searches.
9,000+ citation styles — Generate citations and bibliographies in over 9,000 citation styles for any discipline.
Word processor integration — Insert citations and bibliographies directly inside Microsoft Word, LibreOffice, and Google Docs.
Cross-device sync — Sync libraries, notes, and files across desktop apps (Mac, Windows, Linux), mobile apps (iOS, Android), and browser connectors.
Group libraries — Share collections and collaborate with colleagues in group libraries at no extra storage cost.
Pros & Cons
Pros
Free and open-source with no ads or data-selling business model
Supports over 9,000 citation styles and integrates directly with Word, LibreOffice, and Google Docs
Automatically captures citation data while browsing academic databases and library catalogs
Cross-platform apps for Mac, Windows, Linux, iOS, and Android plus browser connectors
Group libraries let teams share research and collaborate at no extra storage cost
Cons
Free tier storage is capped at 300MB, so heavy PDF/attachment users will likely need a paid storage subscription
Full cross-device syncing beyond the free allowance requires a paid Zotero Storage plan
Interface and workflow polish trail some modern proprietary reference managers