Which reference manager is right for me?
All the reference managers listed have access to many thousands of citation styles. They all also are bundled with citation plugins for word processors and with a variety of browser extensions for citation and reference management. All these reference managers have the ability to share their libraries with others and work collaboratively as well.
EndNote Online is free software published by the company Clarivate. While EndNote Online is free and runs on your web browser, a paid license for EndNote X20 gives access to a desktop client with significantly more features, including the ability to automatically abbreviate journal titles. However, EndNote Online alone has a robust citation plugin and is deeply integrated into Web of Science, a large multidisciplinary database with many features itself. EndNote Online requires some setup but is simple afterward. For more details, please see our guide to EndNote Online.
Zotero is a free open-source software published by the Corporation for Digital Scholarship. Additional cloud storage can be purchased for Zotero for a subscription fee, but Zotero can store files locally on your computer instead if you download the desktop version. The program also has a built in PDF reader and PDF annotation features. Zotero's citation plugin is easy to set up but can be slightly difficult to navigate for new users. Zotero is not integrated into databases, but it does come with a Zotero Connector browser extension to allow for easy reference capture. For more details, please see our guide to using Zotero.
Reference managers are all about your preference! Try different tools and find what works best for you.