: Officially, Nagios XI requires a valid license for full functionality. The licensing model can vary based on the number of hosts and services you wish to monitor. It's best to consult the official Nagios XI website or contact their sales team for the most accurate and up-to-date pricing information.
: Nagios XI offers a trial version that allows users to test its features before making a purchase. This can be a good way to evaluate the software's suitability for specific needs.