Table 1 shows platforms and browser compatibility. All four products offer a web-based version that works with recent versions of popular browsers. Some tools offer plug-ins for other browsers as well, and all offer browser add-ons bookmarklets, extensions, etc. The Mendeley browser add-on functions only with the online version of Mendeley; the Zotero add-on requires the desktop version for full functionality; and the EndNote add-on can be used in the desktop and online versions. Of the four products, only EndNote and Mendeley offer mobile apps. While RefWorks and Zotero do not have mobile apps, they do have mobile-friendly sites. Users can search within databases, mark references to save or export, and select from a variety of options to add references to their preferred citation manager tools. Each of the products has direct export options for at least one of the following databases: Users can also use the browser add-ons to automatically import references into their reference collections. The add-ons for Mendeley, RefWorks, and Zotero allow users to import references to their reference collections from multiple databases.
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