Admin users in Vtiger CRM have full access to all CRM modules, settings, and configurations, allowing them to manage the CRM setup, user accounts, permissions, and integrations. They can add, edit, or delete users, configure workflows, modules, and reports, making them suitable for IT teams, CRM managers, or business owners.
On the other hand, Single App users have access restricted to a specific application or module within the CRM. They are only permitted to use one app or feature, making them ideal for specialized roles where the user only interacts with one functional area of the CRM. This user type is cost-efficient for users with specific and limited requirements.