SharePoint comes with SharePoint Designer, a tool for designing workflows without having to write code. It's rule-based; for example, changes to items in a library or list can trigger a document review process. Nintex Workflow adds drag-and-drop workflow building to SharePoint Designer, as well as advanced workflow features. It uses a browser-based graphical interface, so it doesn't require separate client software, and sends notifications by email, SMS, or instant messaging. The Enterprise Edition includes LazyApproval for responding to notifications in natural language. The package comes in three versions: Workgroup, Standard, and Enterprise (the latter costs $17,500 per front-end server). The Workgroup version is limited to five team sites, among other workgroup-related features. The Enterprise edition adds user profile management and account provisioning features.