AppDynamics vs Nagios

AppDynamics is an application performance monitoring (APM) platform by Cisco that provides real-time visibility into application performance, user experience, and business outcomes. It supports full-stack monitoring across on-premises and cloud environments.

Nagios is Long-established open-source infrastructure monitoring system for servers, networks, and services with an extensive plugin ecosystem.. It is available under a free model. This tool falls under the monitoring category.