While DropBox is designed mainly for individuals and small businesses, Box.net offers features designed more for large groups and the enterprise. Beyond DropBox's file repository model, Box.net also allows users to collaborate on documents, add comments, assign tasks and make changes online. Files also can be easily shared by sending a link, and file collaborators can receive email notifications when files are viewed, edited or commented on. The first 5 GB are free, after which a personal plan starts at $9.99/month for 25 GB, a business plan starts at $15 per user/month for 1 TB and the enterprise plan offers unlimited storage. Box.net is available for Android, iOS, Mac OS X and Windows platforms.