EndNote Web and EndNote Classic Online are the web-based versions of EndNote, available over the internet for the organisation and management of bibliographic citations and references. It enables users to:
EndNote Web is only available to users of the desktop version of EndNote. The EndNote guide has further installation information.
EndNote Online Classic (Free)
Free Version of EndNote Classic with a limit of 50,000 references, 2GB attachment storage and 21 referencing styles. Includes a limited online search.
Endnote Online Classic (Synced with Endnote)
EndNote Online Classic with additional functionality, enabled when synced with the University's EndNote subscription. Includes an unlimited number of references and attachment storage with 6000 referencing styles.
Also online search filter that allows users to search thousands of resources, like PubMed, for references directly from the online account interface. This also includes the Share feature. This feature will enable users to share Groups with other EndNote users.
Endnote Web
Latest interface with increased usability. Very similar to EndNote Online, but it does not include the Online Search or the Share Feature.
Which one should I choose?
If you are mainly going to be working on the web version and collaborating with other users remotely who might not have a full EndNote subscription, use EndNote Online.
If you are going to be using EndNote Desktop for the advanced functionality and instead want access to the latest web interface, use EndNote Web.
If you can however, always use EndNote Desktop. This is the software with the most functionality and does not rely on an Internet connection for managing your references.